Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: System Too Lean Bank 1 (P017100,P017200,P017400,P017500,P117000,P117B00)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Engine & Hybrid System / 2gr-fks (engine Control) / Sfi System / System Too Lean Bank 1 (P017100,P017200,P017400,P017500,P117000,P117B00)

DESCRIPTION

The fuel trim is related to the feedback compensation value, not to the basic injection duration. The fuel trim consists of both the short-term and long-term fuel trims.

The short-term fuel trim is fuel compensation that is used to constantly maintain the air fuel ratio at stoichiometric levels. The signal from the air fuel ratio sensor indicates whether the air fuel ratio is rich or lean compared to the stoichiometric ratio. This triggers a reduction in the fuel injection volume if the air fuel ratio is rich and an increase in the fuel injection volume if lean.

Factors such as individual engine differences, wear over time and changes in operating environment cause short-term fuel trim to vary from the central value. The long-term fuel trim, which controls overall fuel compensation, compensates for long-term deviations in the fuel trim from the central value caused by the short-term fuel trim compensation.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P017100

System Too Lean Bank 1

With a warm engine and stable air fuel ratio feedback, the fuel trim is considerably in error to the lean side (2 trip detection logic).
  • Intake system
  • Fuel injector assembly (for port injection)
  • Fuel injector assembly (for direct injection)
  • Mass air flow meter sub-assembly
  • Engine coolant temperature sensor
  • Fuel pressure
  • Fuel pressure sensor (for high pressure side)
  • Gas leak from exhaust system
  • Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit
  • Air fuel ratio sensor (bank 1 sensor 1)
  • PCV valve and hose
  • PCV hose connections
  • Wire harness or connector
  • ECM

Comes on

DTC stored

SAE Code: P0171

P017200

System Too Rich Bank 1

With a warm engine and stable air fuel ratio feedback, the fuel trim is considerably in error to the rich side (2 trip detection logic).
  • Intake system
  • Fuel injector assembly (for port injection)
  • Fuel injector assembly (for direct injection)
  • Mass air flow meter sub-assembly
  • Engine coolant temperature sensor
  • Ignition system
  • Fuel pressure
  • Fuel pressure sensor (for high pressure side)
  • Gas leak from exhaust system
  • Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit
  • Air fuel ratio sensor (bank 1 sensor 1)
  • Wire harness or connector
  • ECM

Comes on

DTC stored

SAE Code: P0172

P017400

System Too Lean Bank 2

With a warm engine and stable air fuel ratio feedback, the fuel trim is considerably in error to the lean side (2 trip detection logic).
  • Intake system
  • Fuel injector assembly (for port injection)
  • Fuel injector assembly (for direct injection)
  • Mass air flow meter sub-assembly
  • Engine coolant temperature sensor
  • Fuel pressure
  • Fuel pressure sensor (for high pressure side)
  • Gas leak from exhaust system
  • Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit
  • Air fuel ratio sensor (bank 2 sensor 1)
  • PCV valve and hose
  • PCV hose connections
  • Wire harness or connector
  • ECM

Comes on

DTC stored

SAE Code: P0174

P017500

System Too Rich Bank 2

With a warm engine and stable air fuel ratio feedback, the fuel trim is considerably in error to the rich side (2 trip detection logic).
  • Intake system
  • Fuel injector assembly (for port injection)
  • Fuel injector assembly (for direct injection)
  • Mass air flow meter sub-assembly
  • Engine coolant temperature sensor
  • Ignition system
  • Fuel pressure
  • Fuel pressure sensor (for high pressure side)
  • Gas leak from exhaust system
  • Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit
  • Air fuel ratio sensor (bank 2 sensor 1)
  • Wire harness or connector
  • ECM

Comes on

DTC stored

SAE Code: P0175

P117000

Fuel Performance/Port Injector

Although a DTC is stored for a rich or lean condition, the amount of fuel trim during direct injection is normal (1 trip detection logic)
  • Fuel injector assembly (for port injection)
  • Fuel injector assembly (for direct injection)
  • Fuel pressure
  • ECM

Does not come on

DTC stored

SAE Code: P1170

P117B00

Fuel Performance/Direct Injector

Although a DTC is stored for a rich or lean condition, the amount of fuel trim during port injection is normal (1 trip detection logic)
  • Fuel injector assembly (for port injection)
  • Fuel injector assembly (for direct injection)
  • Fuel pressure
  • ECM

Does not come on

DTC stored

SAE Code: P117B

HINT:

  • When DTC P017100 or P017400 is stored, the actual air fuel ratio is on the lean side. When DTC P017200 or P017500 is stored, the actual air fuel ratio is on the rich side.
  • If the vehicle runs out of fuel, the air fuel ratio is lean and DTC P017100 or P017400 may be stored. The MIL is then illuminated.
  • When DTC P117000 or P117B00 is output , it may not be possible to precisely determine whether the port injection or the direct injection is malfunctioning, depending on the conditions. In this case, perform an Active Test (Control the Injection Mode) to determine which injection system is malfunctioning.

MONITOR DESCRIPTION

Under closed loop fuel control, fuel injection volumes that deviate from those estimated by the ECM cause changes in the long-term fuel trim compensation value. The long-term fuel trim is adjusted when there are persistent deviations in the short-term fuel trim values. Deviations from the fuel injection volumes estimated by the ECM also affect the average fuel trim learned value, which is a combination of the average short-term fuel trim (fuel feedback compensation value) and the average long-term fuel trim (learned value of the air fuel ratio). If the average fuel trim learned value exceeds the malfunction thresholds, the ECM interprets this as a fault in the fuel system and stores a DTC.

Example:

The average fuel trim learned value is +35% or higher, or -35% or less, the ECM interprets this as a fuel system malfunction.

MONITOR STRATEGY

Related DTCs

P0171: Fuel trim lean (bank 1)

P0172: Fuel trim rich (bank 1)

P0174: Fuel trim lean (bank 2)

P0175: Fuel trim rich (bank 2)

P1170: Fuel trim (port injection fail)

P117B: Fuel trim (direct injection fail)

Required Sensors/Components (Main)

Fuel system

Required Sensors/Components (Related)

Air fuel ratio sensor

Mass air flow meter sub-assembly

Crankshaft position sensor

Frequency of Operation

Continuous

Duration

Within 10 seconds

MIL Operation

2 driving cycles: P0171, P0172, P0174, P0175

Immediate: P1170, P117B

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

P0010, P0020 (VVT oil control solenoid bank 1, 2)

P0011, P0021 (VVT system bank 1, 2 - advance)

P0012, P0022 (VVT system bank 1, 2 - retard)

P0013, P0023 (Exhaust VVT oil control solenoid bank 1, 2)

P0014, P0024 (Exhaust VVT system bank 1, 2 - advance)

P0015, P0025 (Exhaust VVT system bank 1, 2 - retard)

P0016, P0018 (VVT system bank 1, 2 - misalignment)

P0017, P0019 (Exhaust VVT system bank 1, 2 - misalignment)

P0031, P0032, P0051, P0052, P101D, P103D (Air fuel ratio sensor heater)

P0191, P0192, P0193 (Fuel pressure sensor (for high pressure side))

P0101, P0102, P0103 (Mass air flow meter)

P0117, P0118 (Engine coolant temperature sensor)

P0121, P0122, P0123, P0222, P0223, P2135 (Throttle position sensor)

P0125 (Insufficient coolant temperature for closed loop fuel control)

P0201, P0202, P0203, P0204, P0205, P0206, P062D, P21CF, P21D0, P21D1, P21D2, P21D3, P21D4 (Fuel injector)

P0335, P0337, P0338 (Crankshaft position sensor)

P0340, P0342, P0343, P0345, P0347, P0348 (VVT sensor)

P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT sensor)

P0500 (Vehicle speed sensor)

P107B, P107C, P107D (Fuel pressure sensor (for low pressure side))

P11EA, P11EB, P11EC, P11ED, P11EE, P11EF, P11F0, P11F1, P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1 (Air-fuel ratio imbalance)

Fuel system status

Closed loop

Battery voltage

11 V or higher

Either of the following conditions is met

1 or 2

1. Engine speed

Less than 650 rpm

2. Engine load

12% or higher

Catalyst monitor

Not executed

TYPICAL MALFUNCTION THRESHOLDS

P0171, P0172, P0174 and P0175: Fuel-Trim Lean/Rich

EVAP purge-cut

Executing

Either of the following conditions is met

1 or 2

1. Average between short-term fuel trim and long-term fuel trim

35% or higher (varies with engine coolant temperature)

2. Average between short-term fuel trim and long-term fuel trim

-35% or less (varies with engine coolant temperature)
P1170: Fuel Trim (Port Injection Fail)

DTCs of fuel system have already been set

-

EVAP purge-cut

Executing

Direct injection

100%

Both of the following conditions are met

1 and 2

1. Average between short-term fuel trim and long-term fuel trim

Less than 35% (varies with engine coolant temperature)

2. Average between short-term fuel trim and long-term fuel trim

Higher than -35% (varies with engine coolant temperature)
P117B: Fuel Trim (Direct Injection Fail)

DTCs of fuel system have already been set

-

EVAP purge-cut

Executing

Port injection

100%

Both of the following conditions are met

1 and 2

1. Average between short-term fuel trim and long-term fuel trim

Less than 35% (varies with engine coolant temperature)

2. Average between short-term fuel trim and long-term fuel trim

Higher than -35% (varies with engine coolant temperature)

CONFIRMATION DRIVING PATTERN

HINT:

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here

  • Permanent misfire and fuel system DTCs can only be cleared when performing the universal trip driving pattern when no malfunction is detected.
  1. Connect the Techstream to the DLC3.
  2. Turn the engine switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the engine switch off and wait for at least 30 seconds.
  6. Turn the engine switch on (IG) [A].
  7. Turn the Techstream on.
  8. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off [B].
  9. With the engine warmed up, idle the engine for 2 minutes or more [C].
  10. Drive the vehicle at a speed between 60 and 100 km/h (37 and 62 mph) for 5 minutes or more [D].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  11. Enter the following menus: Powertrain / Engine / Trouble Codes [E].
  12. Read the pending DTCs.

    HINT:

    If a pending DTC is output, the system is malfunctioning.

WIRING DIAGRAM

  • Refer to DTC P010012 for the mass air flow meter sub-assembly circuit.

    Click here

  • Refer to DTC P219519 for the air fuel ratio sensor circuit.

    Click here

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

  • Bank 1 refers to the bank that includes the No. 1 cylinder*.

    *: The No. 1 cylinder is the cylinder which is farthest from the transaxle.

  • Bank 2 refers to the bank that does not include the No. 1 cylinder.
  • Sensor 1 refers to the sensor closest to the engine assembly.
  • Sensor 2 refers to the sensor farthest away from the engine assembly.
  • A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
  • A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.
  • Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P017100, P017200, P017400, P017500, P117000 OR P117B00)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTC P017100, P017200, P017400, P017500, P117000 or P117B00 is output

A

DTC P017100, P017200, P017400, P017500, P117000 and/or P117B00 and other DTCs are output

B

HINT:

If any DTCs other than P017100, P017200, P017400, P017500, P117000 or P117B00 are output, troubleshoot those DTCs first.

B

GO TO DTC CHART

A

2.

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION MODE)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Start the engine and warm it up.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Mode / Port / Data List / Injection Mode, Short FT B1S1, Long FT B1S1, Short FT B2S1 and Long FT B2S1.

Powertrain > Engine > Active Test

Active Test Display

Control the Injection Mode

Data List Display

Coolant Temperature

Injection Mode

Short FT B1S1

Short FT B2S1

Long FT B1S1

Long FT B2S1

(f) According to the display on the Techstream, read the Data List with the Active Test "Control the Injection Mode" set to Port.

OK:

Techstream Display

Specified Condition

Total of Short FT B1S1 (B2S1) and Long FT B1S1 (B2S1)

Between -19 and 19%

(g) According to the display on the Techstream, read the Data List with the Active Test "Control the Injection Mode" set to Direct.

OK:

Techstream Display

Specified Condition

Total of Short FT B1S1 (B2S1) and Long FT B1S1 (B2S1)

Between -19 and 19%

Item

Proceed to

Port

Direct

OK

OK

A

OK

NG

B

NG

OK

C

NG

NG

D
B

GO TO STEP 4

C

GO TO STEP 10

D

GO TO STEP 11

A

3.

CHECK IF VEHICLE HAS RUN OUT OF FUEL IN PAST

(a) Has the vehicle run out of fuel in the past?

YES

DTC CAUSED BY RUNNING OUT OF FUEL
NO

CHECK FOR INTERMITTENT PROBLEMS

4.

READ VALUE USING TECHSTREAM (FUEL PRESSURE (HIGH))

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Start the engine and warm it up.

(e) Enter the following menus: Powertrain / Engine / Data List / Fuel Pressure (High).

Powertrain > Engine > Data List

Tester Display

Fuel Pressure (High)

(f) Read the values.

Standard:

2400 to 20000 kPag (3000 rpm, engine warmed up, shift lever in P, A/C off).

NG

GO TO STEP 7

OK

5.

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION MODE (DIRECT))

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

(c) Start the engine and warm it up.

(d) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Mode / Direct / Data List / High Pressure Fuel Pump Duty Ratio (D4), Injection Mode, Short FT B1S1, Long FT B1S1, Short FT B2S1 and Long FT B2S1.

Powertrain > Engine > Active Test

Active Test Display

Control the Injection Mode

Data List Display

High Pressure Fuel Pump Duty Ratio (D4)

Injection Mode

Short FT B1S1

Short FT B2S1

Long FT B1S1

Long FT B2S1

(e) According to the display on the Techstream, read the Data List with the Active Test "Control the Injection Mode" set to Direct.

HINT:

The A/C switch and all accessory switches should be off, and the shift lever should be in the P position, and the engine should be fully warmed up.

Item

Proceed to

Injection Mode

High Pressure Fuel Pump Duty Ratio (D4)

Short FT B1S1 + Long FT B1S1

Short FT B2S1 + Long FT B2S1

Direct

10% to 40%

-

-

A

40% or higher

-20% or less

-20% or less

B

10% or less

20% or higher

20% or higher

40% or higher

20% or higher

20% or higher

C

10% or less

-20% or less

-20% or less

D

HINT:

Perform "Inspection After Repair" after replacing the fuel pressure sensor (for high pressure side).

Click here

B

REPLACE FUEL DELIVERY PIPE WITH SENSOR ASSEMBLY LH (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE))

C

GO TO STEP 8

D

REPLACE ECM

A

6.

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION MODE (DIRECT))

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

(c) Start the engine and warm it up.

(d) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Mode / Direct / Data List / High Pressure Fuel Pump Duty Ratio (D4), Injection Mode, Short FT B1S1, Long FT B1S1, Short FT B2S1 and Long FT B2S1.

Powertrain > Engine > Active Test

Active Test Display

Control the Injection Mode

Data List Display

High Pressure Fuel Pump Duty Ratio (D4)

Injection Mode

Short FT B1S1

Short FT B2S1

Long FT B1S1

Long FT B2S1

(e) According to the display on the Techstream, read the Data List with the Active Test "Control the Injection Mode" set to Direct.

HINT:

The A/C switch and all accessory switches should be off, and the shift lever should be in the P position, and the engine should be fully warmed up.

Item

Proceed to

Injection Mode

High Pressure Fuel Pump Duty Ratio (D4)

Short FT B1S1 + Long FT B1S1

Short FT B2S1 + Long FT B2S1

Direct

10% to 40%

-25% or less

-25% or less

A

10% to 40%

30% or higher

30% or higher

10% to 40%

-25% or less

-25% to 25%

B

10% to 40%

25% or higher

-25% to 25%

10% to 40%

-25% to 25%

-25% or less

C

10% to 40%

-25% to 25%

25% or higher

10% to 40%

-25% to 25%

-25% to 25%

D

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly (for direct injection).

Click here

A

REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION (ALL CYLINDERS))

B

REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION (BANK 1))

C

REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION (BANK 2))

D

CHECK FOR INTERMITTENT PROBLEMS

7.

CHECK MISFIRE COUNT OF DIRECT INJECTION

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Start the engine and warm it up.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Mode / Direct / Data List / Injection Mode and Misfire Count Cylinder #1 to Misfire Count Cylinder #6.

Powertrain > Engine > Active Test

Active Test Display

Control the Injection Mode

Data List Display

Injection Mode

Misfire Count Cylinder #1

Misfire Count Cylinder #2

Misfire Count Cylinder #3

Misfire Count Cylinder #4

Misfire Count Cylinder #5

Misfire Count Cylinder #6

HINT:

  • When using the "Control the Injection Mode" Active Test to check the condition of the engine, switch from "Port" to "Direct".
  • Do not switch from "Direct" to "Port". When performing the inspection more than once, after the Active Test ends, lightly race the engine, and then perform the inspection from "Port" again.
  • If the display does not switch from "Port" even after lighting racing the engine, idle the engine for approximately 1 minute, and then lightly race the engine.

(f) Read the values displayed on the Techstream.

HINT:

The A/C switch and all accessory switches should be off, and the shift lever should be in the P position, and the engine should be fully warmed up.

Injection Mode

Misfire Count

Proceed to

Direct

No misfire counts, or misfire counts occur randomly in all cylinders

A

Misfire counts occur in particular cylinder

B

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly (for direct injection).

Click here

B

REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION)

A

8.

REPLACE FUEL (ENGINE ROOM SIDE) PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE)

(a) Replace the fuel pump assembly (for high pressure side).

Click here

HINT:

Perform "Inspection After Repair" after replacing the fuel pump assembly (for high pressure side).

Click here

NEXT

9.

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED (DTC P017100, P017200, P017400, P017500, P117000 OR P117B00)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(e) Turn the engine switch off and wait for at least 30 seconds.

(f) Turn the engine switch on (IG).

(g) Turn the Techstream on.

(h) Start the engine and warm it up.

(i) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(j) Enter the following menus: Powertrain / Engine / Trouble Codes.

(k) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC P017100, P017200, P017400, P017500, P117000 and/or P117B00 are output

B
A

END
B

REPLACE ECM

10.

INSPECT FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION)

(a) Inspect the injection volume (whether fuel volume is high or low, and whether injection pattern is poor).

Click here

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly (for port injection).

Click here

OK

REPLACE ECM

NG

REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION)

11.

CHECK PCV HOSE CONNECTIONS

(a) Check the PCV hose connections.

Click here

OK:

PCV valve and hose are connected correctly and are not damaged.

NG

REPAIR OR REPLACE PCV HOSE
OK

12.

CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks.

Click here

OK:

No leaks from the intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click here

NG

REPAIR OR REPLACE INTAKE SYSTEM
OK

13.

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

(c) Start the engine and warm it up until the engine coolant temperature reaches 80°C (176°F) or higher.

(d) Warm up the air fuel ratio sensor at an engine speed of 2500 rpm for 90 seconds.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2 or A/F (O2) Sensor Voltage B2S1 and O2 Sensor Voltage B2S2.

Powertrain > Engine > Active Test

Active Test Display

Control the Injection Volume for A/F Sensor

Data List Display

A/F (O2) Sensor Voltage B1S1

A/F (O2) Sensor Voltage B2S1

O2 Sensor Voltage B1S2

O2 Sensor Voltage B2S2

(f) Perform the Control the Injection Volume for A/F Sensor operation with the engine idling (change the fuel injection volume).

(g) Monitor the voltage outputs of the air fuel ratio sensor and the heated oxygen sensor (A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2 or A/F (O2) Sensor Voltage B2S1 and O2 Sensor Voltage B2S2) displayed on the Techstream.

HINT:

  • The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 12.5%.
  • The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
  • If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

Standard:

Techstream Display (Sensor)

Injection Volume

Status

Voltage

A/F (O2) Sensor Voltage B1S1

A/F (O2) Sensor Voltage B2S1

(Air fuel ratio)

12.5%

Rich

Below 3.1 V

-12.5%

Lean

Higher than 3.4 V

O2 Sensor Voltage B1S2

O2 Sensor Voltage B2S2

(Heated oxygen)

12.5%

Rich

Higher than 0.55 V

-12.5%

Lean

Below 0.4 V

Status of A/F (O2) Sensor Voltage B1S1 or A/F (O2) Sensor Voltage B2S1

Status of O2 Sensor Voltage B1S2 or O2 Sensor Voltage B2S2

Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition

Suspected Trouble Area

Proceed to

Lean/Rich

Lean/Rich

Normal

-

A

Lean

Lean

Actual air fuel ratio lean
  • PCV valve and hose
  • PCV hose connections
  • Gas leak from exhaust system
  • Intake system
  • Fuel pressure
  • Mass air flow meter sub-assembly
  • Engine coolant temperature sensor

Rich

Rich

Actual air fuel ratio rich
  • Gas leak from exhaust system
  • Ignition system
  • Fuel pressure
  • Mass air flow meter sub-assembly
  • Engine coolant temperature sensor

Lean

Lean/Rich

Air fuel ratio sensor malfunction
  • Air fuel ratio sensor

B

Rich

Lean/Rich

Air fuel ratio sensor malfunction
  • Air fuel ratio sensor
  • Lean: During Control the Injection Volume for A/F Sensor of the Active Test, the air fuel ratio sensor output voltage (A/F (O2) Sensor Voltage B1S1 or A/F (O2) Sensor Voltage B2S1) is consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2 Sensor Voltage B1S2 or O2 Sensor Voltage B2S2) is consistently below 0.4 V.
  • Rich: During Control the Injection Volume for A/F Sensor of the Active Test, the A/F (O2) Sensor Voltage B1S1 or A/F (O2) Sensor Voltage B2S1 is consistently below 3.1 V, and the O2 Sensor Voltage B1S2 or O2 Sensor Voltage B2S2 is consistently higher than 0.55 V.
  • Lean/Rich: During Control the Injection Volume for A/F Sensor of the Active Test, the output voltage of the air fuel ratio sensor or heated oxygen sensor alternates correctly.

HINT:

Refer to "Data List / Active Test" [A/F (O2) Sensor Voltage B1S1, O2 Sensor Voltage B1S2, A/F (O2) Sensor Voltage B2S1 or O2 Sensor Voltage B2S2].

Click here

B

GO TO STEP 19

A

14.

READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

Powertrain > Engine > Data List

Tester Display

Coolant Temperature

(e) Read the Data List twice, when the engine is both cold and warmed up.

Standard:

Techstream Display

Condition

Specified Condition

Coolant Temperature

Cold engine

Same as ambient air temperature

Warm engine

Between 75 and 100°C (167 and 212°F)

HINT:

Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

Click here

NG

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

OK

15.

READ VALUE USING TECHSTREAM (MASS AIR FLOW SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Mass Air Flow Sensor and Coolant Temperature.

Powertrain > Engine > Data List

Tester Display

Engine Speed

Mass Air Flow Sensor

Coolant Temperature

(e) Allow the engine to idle until Coolant Temperature reaches 75°C (167°F) or higher.

(f) Read Mass Air Flow Sensor while maintaining an engine speed of 3000 rpm.

Standard:

Techstream Display

Condition

Specified Condition

Mass Air Flow Sensor

Engine warmed up

Shift lever position: P

A/C: Off

Engine Speed: 3000 rpm

Between 10.6 gm/sec and 15.8 gm/sec
NG

GO TO STEP 23

OK

16.

CHECK FOR EXHAUST GAS LEAK

(a) Check for exhaust gas leaks.

OK:

No gas leaks.

HINT:

Perform "Inspection After Repair" after repairing or replacing the exhaust system.

Click here

NG

REPAIR OR REPLACE EXHAUST SYSTEM
OK

17.

CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE)

(a) Check the fuel pressure (for low pressure side).

Click here

OK

GO TO STEP 22

NG

18.

CHECK FUEL LINE

(a) Check the fuel lines for leaks or blockage.

OK

GO TO FUEL PUMP CONTROL CIRCUIT

NG

REPAIR OR REPLACE FUEL SYSTEM

19.

INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

(a) Inspect the air fuel ratio sensor.

Click here

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor.

Click here

NG

REPLACE AIR FUEL RATIO SENSOR

OK

20.

CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

(a) Disconnect the air fuel ratio sensor connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D24-1 (HA1A) - D2-52 (HA1A)

Always

Below 1 Ω

D24-3 (A1A+) - D2-125 (A1A+)

Always

Below 1 Ω

D24-4 (A1A-) - D2-126 (A1A-)

Always

Below 1 Ω

D23-1 (HA2A) - D2-17 (HA2A)

Always

Below 1 Ω

D23-3 (A2A+) - D2-123 (A2A+)

Always

Below 1 Ω

D23-4 (A2A-) - D2-124 (A2A-)

Always

Below 1 Ω

D24-1 (HA1A) or D2-52 (HA1A) - Body ground and other terminals

Always

10 kΩ or higher

D24-3 (A1A+) or D2-125 (A1A+) - Body ground and other terminals

Always

10 kΩ or higher

D24-4 (A1A-) or D2-126 (A1A-) - Body ground and other terminals

Always

10 kΩ or higher

D23-1 (HA2A) or D2-17 (HA2A) - Body ground and other terminals

Always

10 kΩ or higher

D23-3 (A2A+) or D2-123 (A2A+) - Body ground and other terminals

Always

10 kΩ or higher

D23-4 (A2A-) or D2-124 (A2A-) - Body ground and other terminals

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

21.

REPLACE AIR FUEL RATIO SENSOR

(a) Replace the air fuel ratio sensor.

Click here

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor.

Click here

NEXT

22.

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED (DTC P017100, P017200, P017400, P017500, P117000 OR P117B00)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(e) Turn the engine switch off and wait for at least 30 seconds.

(f) Turn the engine switch on (IG).

(g) Turn the Techstream on.

(h) Start the engine and warm it up.

(i) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(j) Enter the following menus: Powertrain / Engine / Trouble Codes.

(k) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC P017100, P017200, P017400, P017500, P117000 and/or P117B00 are output

B
A

END
B

23.

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)

(a) Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM.

Click here

HINT:

Repair any problems.

NEXT

24.

CHECK WHETHER DTC OUTPUT RECURS (DTC P017100, P017200, P017400, P017500, P117000 OR P117B00)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(e) Turn the engine switch off and wait for at least 30 seconds.

(f) Turn the engine switch on (IG).

(g) Turn the Techstream on.

(h) Start the engine and warm it up.

(i) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(j) Enter the following menus: Powertrain / Engine / Trouble Codes.

(k) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC P017100, P017200, P017400, P017500, P117000 and/or P117B00 are output

B
A

END
B

25.

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D9-3 (5V) - D2-90 (VC)

Always

Below 1 Ω

D9-1 (FG) - D2-116 (VG)

Always

Below 1 Ω

D9-2 (E2G) - D2-115 (E2G)

Always

Below 1 Ω

D9-3 (5V) or D2-90 (VC) - Body ground and other terminals

Always

10 kΩ or higher

D9-1 (FG) or D2-116 (VG) - Body ground and other terminals

Always

10 kΩ or higher

D9-2 (E2G) or D2-115 (E2G) - Body ground and other terminals

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

26.

INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

(a) Inspect the mass air flow meter sub-assembly.

Click here

NEXT

27.

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(e) Turn the engine switch off and wait for at least 30 seconds.

(f) Turn the engine switch on (IG).

(g) Turn the Techstream on.

(h) Start the engine and warm it up.

(i) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(j) Enter the following menus: Powertrain / Engine / Trouble Codes.

(k) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC P017100, P017200, P017400, P017500, P117000 and/or P117B00 are output

B
A

END
B

REPLACE ECM

    O2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 1 (P014C00-P014F00,P015A00-P015D00)
    DESCRIPTION Refer to DTC P219519. Click here HINT: Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor. DTC No. Detection Item DTC Detection Condition ...

    Fuel Rail Pressure Sensor "A" Circuit Short to Ground (P019011)
    DESCRIPTION The fuel pressure sensor (for high pressure side) is installed on the fuel delivery pipe (for high pressure side). The fuel pressure sensor (for high pressure side) changes the fuel press ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Shift Lever: Reassembly
    REASSEMBLY PROCEDURE 1. INSTALL SHIFT POSITION INDICATOR (a) Install the shift position indicator and console box bracket to the upper console panel sub-assembly with the 2 screws. *1 Console Box Bracket *2 Shift Position Indicator 2. INSTALL ELECTRIC PARKING BRAKE S ...

    Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Intuitive Parking Assist System (w/ Intelligent Clearance Sonar System): Rear Right Sensor Malfunction (C1AE9)
    DESCRIPTION The rear corner ultrasonic sensor RH is installed to the rear bumper. The clearance warning ECU assembly detects obstacles based on signals received from the rear corner ultrasonic sensor RH. If the rear corner ultrasonic sensor RH has an open circuit or other malfunction, it will not fu ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2024 Copyright www.lexusrx.net
    0.0182