AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P074512

DTC Code DTC Name
P074512 Pressure Control Solenoid "A" Circuit Short to Battery

DESCRIPTION

Changing gears is performed by the ECM turning the solenoid (SL1, SL2, SL3, SL4, SL5 and SL6) valves on and off.

If an open or short occurs in any of the solenoid valve circuits, the ECM controls the remaining normal solenoid valves to allow the vehicle to be driven. If all of the 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 solenoid valve circuit, the ECM cuts power to the malfunctioning solenoid valve.

Tech Tips

The following table shows normal operation of the solenoid (SL1) valve when the shift lever is in D.

Solenoid Valve Operation:
Gear 1st 2nd 3rd 4th 5th 6th 7th 8th
Solenoid (SL1) Valve ON ON ON ON ON OFF OFF OFF
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P074512 Pressure Control Solenoid "A" Circuit Short to Battery

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


  1. Driving so that gear changes occur

  2. Solenoid (SL1) valve circuit is short to +B

  3. 1 second

  4. 1-trip detection logic


  • Solenoid (SL1) valve

  • Transmission wire

  • Harness and connector

  • ECM

Comes on DTC stored

SAE Code:

P0963

MONITOR DESCRIPTION

This DTC indicates a short to +B in the solenoid (SL1) valve circuit. The ECM commands gear shifts by turning the solenoid valves on or off. When there is an open or short in any solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores a DTC.

The ECM performs the fail-safe function and turns the other normal solenoid valves on or off. In the case of an open or short circuit, the ECM stops sending current to the open or shorted solenoid.

WIRING DIAGRAM

B003Z3FE56
*a Solenoid (SL1) Valve
*b Transmission Wire

CAUTION / NOTICE / HINT

Note

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

Click here

Tech Tips

After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Perform the D Position Shift Test inspection in Road Test.

    Click here

  2. Check for DTCs again.

    Click here

PROCEDURE


  1. CHECK HARNESS AND TRANSMISSION WIRE (TRANSMISSION WIRE (SOLENOID (SL1) VALVE) - ECM)


    1. Disconnect the C1 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C1-12 (SL1+) or C1-13 (SL1-) - Other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  2. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT
  3. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)


    1. Disconnect the C62 transmission wire connector.

    2. Disconnect the C1 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C62-17 (SL1+) or C1-12 (SL1+) - Other terminals Always 10 kΩ or higher
      C62-16 (SL1-) or C1-13 (SL1-) - Other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  4. INSPECT SOLENOID (SL1) VALVE


    1. B003Z4NC76
      *a

      Component without harness connected

      (Solenoid (SL1) Valve)

      Remove the solenoid (SL1) valve.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Solenoid (SL1) valve connector terminal 1 - terminal 2 20°C (68°F) 5.0 to 5.6 Ω
    3. Connect a positive (+) lead from the battery with a 21 W bulb to terminal 1 and a negative (-) lead to terminal 2 of the solenoid valve connector. Check that the valve moves and makes an operating sound.

      OK
      Valve moves and makes an operating sound.
      Result
      Proceed to
      OK
      NG

    OK
    NG