Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Startability Malfunction (P160400)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Engine & Hybrid System / 2gr-fks (engine Control) / Sfi System / Startability Malfunction (P160400)

DESCRIPTION

This DTC is stored when the engine does not start even though the STA signal is input or when the engine takes a long time to start, and when the engine speed is low or the engine stalls just after the engine starts.

Using the Techstream, the conditions present when the DTC was stored can be confirmed by referring to the freeze frame data. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.

It is necessary to check if the vehicle ran out of fuel before performing troubleshooting, as this DTC is also stored when there is engine starting trouble due to running out of fuel.

DTC No.

Detection Item

DTC Detection Condition

MIL

Memory

Note

P160400

Startability Malfunction

Either conditions is met (1 trip detection logic):

  • The engine speed is below 500 rpm with the STA signal on for a certain amount of time (refer to the illustration below).
  • After the engine starts (engine speed is 500 rpm or more), the engine speed drops to 200 rpm or less within approximately 2 seconds.

Does not come on

DTC stored

SAE Code: P1604

Trouble Area

Ignition system
  • Spark plug
  • Ignition coil assembly

Fuel system
  • Fuel injector assembly (for direct injection)
  • Fuel injector assembly (for port injection)
  • Fuel pump assembly (for high pressure side)
  • Fuel pump (for low pressure side)
  • Fuel pump control circuit
  • Fuel suction plate sub-assembly
  • Fuel main valve assembly
  • Fuel line
  • Purge VSV system
  • Fuel quality (existence of foreign matter, degradation)

Intake and exhaust systems
  • Mass air flow meter sub-assembly
  • Intake system

    (Air leaks or deposit accumulation)

  • Throttle body with motor assembly
  • Air fuel ratio sensor
  • Heated oxygen sensor
  • Cam timing oil control solenoid assembly
  • Camshaft timing oil control valve assembly
  • Variable Valve Timing system (VVT system)

Other control systems
  • ECM
  • Wire harness or connector
  • Knock control sensor
  • Engine coolant temperature sensor

Engine
  • Water inlet with thermostat sub-assembly
  • Engine assembly

High load from another system
  • Air conditioning system
  • Power steering system
  • Electrical load signal system
  • A/T system

CAUTION / NOTICE / HINT

HINT:

  • DTC P160400
    • In contrast to normal malfunction diagnosis for components, circuits and systems, DTC P160400 is used to determine the malfunctioning area from the problem symptoms and freeze frame data when the user mentions problems such as starting difficulty.

      As this DTC can be stored as a result of certain user actions, even if the DTC is output, if the customer makes no mention of problems, clear the DTC without performing any troubleshooting and return the vehicle to the customer.

    • As DTCs may be stored when an Active Test or learning is performed, make sure to clear the DTCs before returning the vehicle to the customer.
    • If any other DTCs are output, perform troubleshooting for those DTCs first.
  • DATA LIST / FREEZE FRAME DATA
    • When this Data List item "Immobiliser Communication" is OFF or "Immobiliser Fuel Cut Status" is ON, the engine cannot be started.
    • Read freeze frame data using the Techstream. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.
    • When confirming the freeze frame data, be sure to check all multi freeze frame data.

      Click here

    • When confirming the freeze frame data, if there are multiple items related to the cause of the malfunction, perform troubleshooting for all related items.
    • Try to start the vehicle under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and compare it with the freeze frame data.
    • If the malfunction does not recur, carefully check the vehicle conditions from when the malfunction occurred using freeze frame data.
  • PRECAUTIONS
    • When performing inspections, jiggle the relevant wire harnesses and connectors in an attempt to reproduce malfunctions that do not always occur.
    • If the same inspection or replacement procedure appears 2 times when performing an inspection procedure, it is not necessary to repeat the procedure the second time.

PROCEDURE

1.

CHECK FOR ANY OTHER DTCS OUTPUT

(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 P160400 is output

A

DTC P160400 and other DTCs are output

B

HINT:

  • If any DTCs other than P160400 is output, troubleshoot those DTCs first.
  • Using freeze frame data, confirm the conditions the moment the DTC was stored and after the DTC was stored. This information can be useful when troubleshooting.
B

GO TO DTC CHART

A

2.

READ FREEZE FRAME DATA (IMMOBILISER COMMUNICATION AND IMMOBILISER FUEL CUT STATUS)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored.

Click here

OK:

Data List Item

Techstream Display

Immobiliser Communication

ON

Immobiliser Fuel Cut Status

OFF

HINT:

  • If the engine is started immediately after reconnecting the battery terminal, the engine may stall immediately after it starts due to the intercommunication process between each ECU. For this reason, when starting the engine after reconnecting the battery terminal, first turn the engine switch on (IG) and then wait several seconds for the communication process to complete before starting the engine.
  • When this operation causes DTC P160400 to be stored, this is due to normal operation of the immobiliser system and does not indicate a malfunction, so clear the DTC and return the vehicle to the customer.
NG

CHECK IMMOBILISER SYSTEM

OK

3.

READ FREEZE FRAME DATA (ISC F/B LEARN TORQUE)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored.

Click here

Freeze Frame Data Item

Result

Suspected Area

Action

Proceed to

ISC F/B Learn Torque

Less than 30 Nm

-

Go to the next step

A

30 Nm or higher

Throttle body with motor assembly

Go to ENGINE DIFFICULT TO START (from step 15)

B
B

GO TO ENGINE DIFFICULT TO START

A

4.

READ FREEZE FRAME DATA (ENGINE SPEED)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored.

Click here

Freeze Frame Data Item

Result

Suspected Area

Action

Proceed to

Engine Speed

All 5 sets of freeze frame data are 0 rpm (engine did not crank or engine speed was not detected properly)
  • Starter signal circuit
  • Crankshaft position sensor system
  • Battery fully depleted

Go to ENGINE DIFFICULT TO START (from step 5)

A

100 to 500 rpm (engine cranked but initial combustion did not occur or was delayed)
  • Fuel pump
  • Leaking fuel injector assembly
  • Spark plug
  • Ignition coil assembly

Go to the next step

B

500 rpm or higher (engine speed dropped immediately after initial combustion)

(Low Revolution for Engine Start is ON)
  • Spark plug
  • Ignition coil assembly
A

GO TO ENGINE DIFFICULT TO START

B

5.

INTERVIEW THE CUSTOMER

(a) Interview the customer for details about the conditions when the malfunction occurred.

HINT:

If the engine is difficult to start only when the vehicle has been left as is for a long time, a leaking fuel injector assembly is suspected.

Result

Suspected Area

Action

Proceed to

Engine is difficult to start only when the vehicle has been left as is for a long time (1 hour or more)

Leaking fuel injector assembly

Go to ENGINE DIFFICULT TO START (from step 4)

A

Other than above
  • Fuel pump
  • Spark plug
  • Ignition coil assembly

Go to the next step

B
A

GO TO ENGINE DIFFICULT TO START

B

6.

INTERVIEW THE CUSTOMER

(a) Interview the customer for details about the conditions when the malfunction occurred.

HINT:

If the vehicle is mostly driven for short distances, deposits may have accumulated on the spark plugs, causing starting difficulty.

Result

Suspected Area

Action

Proceed to

Mostly driven short distances
  • Spark plug
  • Ignition coil assembly

Go to ENGINE DIFFICULT TO START (from step 13)

NEXT

Not mostly driven short distances
  • Fuel pump
  • Spark plug
  • Ignition coil assembly

Go to ENGINE DIFFICULT TO START (from step 9)
NEXT

GO TO ENGINE DIFFICULT TO START

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