Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Pressure Control Solenoid "M" Circuit Short to Battery (P08C312)

Toyota Corolla Cross (2022-2024) Service Manual / Drivetrain / K120f (cvt) / Continuously Variable Transaxle System / Pressure Control Solenoid "M" Circuit Short to Battery (P08C312)

DESCRIPTION

Using the current from the TCM, the shift solenoid valve SLG controls the B1 brake when the shift lever is in R, and S1 synchronizer when the shift lever is in P, N, D or M.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P08C312

Pressure Control Solenoid "M" Circuit Short to Battery

A short to +B is detected in the shift solenoid valve SLG circuit for 1 second or more (1-trip detection logic).
  • Transmission valve body assembly (Shift solenoid valve SLG)
  • Transmission wire
  • Harness and connector
  • TCM

Comes on

DTC stored

SAE Code:

P08CB

MONITOR DESCRIPTION

This DTC indicates a short to +B in the shift solenoid valve SLG circuit. If there is a short to +B in the shift solenoid valve SLG circuit, the TCM detects the malfunction, illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

P08CB: Pressure control solenoid "M" (Shift solenoid valve SLG)/Range check (High voltage)

Required sensors/Components

Shift solenoid valve SLG

Frequency of operation

Continuous

Duration

1 sec.

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All

The monitor will run whenever the following DTCs are not stored

None

Solenoid current cut status

Not cut

Ignition switch

ON

Starter

OFF

Auxiliary battery voltage

10.5 V or more

Target current (0.1 sec. or more)

0.2 A or more

TYPICAL MALFUNCTION THRESHOLDS

Solenoid negative terminal voltage level

High

Solenoid negative terminal voltage monitor

No signal

COMPONENT OPERATING RANGE

Solenoid negative terminal voltage monitor

Signal input

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. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  2. Turn the ignition switch off and wait for 2 minutes or more.
  3. Turn the ignition switch to ON and turn the GTS on.
  4. Start the engine.
  5. 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.

  6. Stop the vehicle.
  7. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  8. Input the DTC: P08C312.
  9. Check the DTC judgment result.

    GTS 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

CAUTION / NOTICE / HINT

NOTICE:

  • Perform the universal trip to clear permanent DTCs.

    Click here

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

    Click here

  • Check that no DTCs are stored after performing initialization.

    Click here

PROCEDURE

1.

INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SLG)

(a) Disconnect the transmission wire connector.

*a

Component without harness connected

(Transmission Wire)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (SLG+) - Other terminals

Always

10 kΩ or higher

6 (SLG-) - Other terminals

Always

10 kΩ or higher

(c) Connect the transmission wire connector.

NG

GO TO STEP 4

OK

2.

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM)

(a) Disconnect the C80 TCM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C80-21 (SLG+) - Other terminals

Always

10 kΩ or higher

C80-22 (SLG-) - Other terminals

Always

10 kΩ or higher

(c) Connect the C80 TCM connector.

NG

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

3.

REPLACE TCM

Click here

NEXT

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here

4.

INSPECT TRANSMISSION WIRE

(a) Disconnect the C61 transmission wire connector.

*1

Transmission Valve Body Assembly

*2

Shift Solenoid Valve SLG

*3

Transmission Wire

-

-

*a

Shift Solenoid Valve Side

*b

Wire Harness Connector Side

(b) Disconnect the transmission wire connector from the shift solenoid valve SLG.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (shift solenoid valve side) or 1 (SLG+) (wire harness connector side) - All other terminals

Always

10 kΩ or higher

2 (shift solenoid valve side) or 6 (SLG-) (wire harness connector side) - All other terminals

Always

10 kΩ or higher
NG

REPLACE TRANSMISSION WIRE

OK

5.

REPLACE TRANSMISSION VALVE BODY ASSEMBLY

Click here

NEXT

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here

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