Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Shift Solenoid "A" Circuit Short to Battery or Open (P075015)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Drivetrain / U881f (automatic Transmission / Transaxle) / Automatic Transaxle System / Shift Solenoid "A" Circuit Short to Battery or Open (P075015)

DESCRIPTION

Changing gears is performed by the ECM turning the shift solenoid valves SL1, SL2, SL3, SL4, SL5, S1 and S2 on and off.

If an open or short occurs in any of the shift solenoid valve circuits, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be driven. If all of the shift solenoid valves are malfunctioning, only the mechanical fluid pressure circuit will function and some manual operation will be possible. If an open or short occurs in a shift solenoid valve circuit, the ECM cuts power to the malfunctioning shift solenoid valve.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P075015

Shift Solenoid "A" Circuit Short to Battery or Open

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other

  • Shift solenoid valve S1 is operated
  • Shift solenoid valve S1 circuit is short to +B or open
  • Malfunction status occurs 2 times per trip
  • 1-trip detection logic
  • Shift solenoid valve S1
  • Transmission wire
  • Harness and connector
  • ECM

Comes on

DTC stored

SAE Code:

P0974

MONITOR DESCRIPTION

This DTC indicates an open or short to +B in the shift solenoid valve S1 circuit. When there is an open or short in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores a DTC.

When the shift solenoid valve S1 is off, if its resistance is 100 kΩ or more, the ECM determines there is an open or short to +B in the shift solenoid valve S1 circuit.

MONITOR STRATEGY

Related DTCs

P0974: Shift solenoid valve S1/Range check (High resistance)

Required sensors/Components

Shift solenoid valve S1

Frequency of operation

Continuous

Duration

2 times

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present

None

Battery voltage

8 V or more

Starter

OFF

Command to solenoid

OFF

Time after command to solenoid (ON to OFF)

0.008192 sec. or more

TYPICAL MALFUNCTION THRESHOLDS

Solenoid terminal voltage level

High

(0.065536 sec. or more)

COMPONENT OPERATING RANGE

Shift solenoid valve S1

Resistance: 11 to 15 Ω at 20°C (68°F)

CONFIRMATION DRIVING PATTERN

CAUTION:

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

HINT:

  • After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
  • When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.

    Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the engine switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the engine switch off and wait for 2 minutes or more.
  5. Turn the engine switch on (IG) and turn the Techstream on.
  6. Start the engine.
  7. Perform the D Position Shift Test inspection in Road Test. [*1]

    Click here

    HINT:

    [*1] : Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  8. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  9. Input the DTC: P075015.
  10. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL
    • DTC judgment completed
    • System normal

    ABNORMAL
    • DTC judgment completed
    • System abnormal

    INCOMPLETE
    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A
    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

WIRING DIAGRAM

Refer to DTC P075011.

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • Perform the universal trip to clear permanent DTCs.

    Click here

  • Perform registration and/or initialization when parts related to the automatic transaxle are replaced.

    Click here

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE (SHIFT SOLENOID VALVE S1) - ECM)

(a) Disconnect the D2 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D2-62 (S1) - Body ground

20°C (68°F)

11 to 15 Ω
NG

GO TO STEP 3

OK

2.

REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

PERFORM A/T CODE REGISTRATION

3.

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

(a) Disconnect the D56 transmission wire connector.

(b) Disconnect the D2 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D56-18 (SR) - D2-62 (S1)

Always

Below 1 Ω

D56-18 (SR) or D2-62 (S1) - Other terminals

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM)
OK

4.

INSPECT SHIFT SOLENOID VALVE S1

(a) Remove the shift solenoid valve S1.

Click here

*1

Shift Solenoid Valve S1

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Shift solenoid valve S1 connector terminal - Shift solenoid valve S1 body

20°C (68°F)

11 to 15 Ω

(c) Connect a positive (+) lead from the battery to the terminal of the solenoid valve connector, and a negative (-) lead to the solenoid body. Check that the valve moves and makes an operating sound.

OK:

Valve moves and makes an operating sound.

OK

REPAIR OR REPLACE TRANSMISSION WIRE

NG

REPLACE SHIFT SOLENOID VALVE S1

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