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 DTC P0768 [JA5AX-EL]

DTC P0768 [JA5AX-EL]

id050206807000

DTC P0768

Reduction timing solenoid valve circuit malfunction (open/short)

DETECTION CONDITION

• Open or short in reduction timing solenoid signal system (while TCM monitors solenoid output voltage, the voltage that differs from the ON/OFF signal output by CPU in TCM is detected.)
Diagnostic support note:
• This is continuous monitor (CCM).
• MIL does not illuminate
• PENDING CODE is not available.
• FREEZE FRAME DATA is not available.
• AT warning light indication.
• DTC is stored in TCM memory.

POSSIBLE CAUSE

• Open circuit between reduction timing solenoid valve terminal A and TCM terminal 2G
• Short to ground between reduction timing solenoid valve terminal A and TCM terminal 2G
• Short to power between reduction timing solenoid valve terminal A and TCM terminal 2G
• Reduction timing solenoid valve malfunction
• Damaged connector between reduction timing solenoid and TCM
• TCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Check for related Service Bulletins and/or on-line repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to available repair information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
2
INSPECT TERMINAL COMPONENT NO.1 (12-PIN) FOR POOR CONNECTION
• Turn ignition key to OFF.
• Disconnect terminal componentNo.1 (12-pin).
• Check for poor connection (damaged, pulled-out, terminals, corrosion, etc.).
• Are terminals okay?
Yes
Go to next step.
No
Repair or replace terminals, then go to Step 12.
3
INSPECT RESISTANCE
• Check resistance between terminal component No.1 (12-pin) terminal E (transaxle case side) and body ground.
• Is resistance within 14-18 ohms?
Yes
Go to Step 8.
No
Go to next step.
4
INSPECT COUPLER COMPONENT (10-PIN) FOR POOR CONNECTION
• Disconnect coupler component (10-pin) connector.
• Check for poor connection (damaged, pulled-out, terminals, corrosion, etc.).
• Is terminal okay?
Yes
Go to next step.
No
Repair or replace terminal, then go to Step 12.
5
INSPECT RESISTANCE
• Check resistance between coupler component (10-pin) terminal I (part side) and body ground.
• Is resistance within 14-18 ohms?
Yes
Repair or replace terminal component No.1 (12-pin), then go to Step 12.
No
Go to next step.
6
INSPECT REDUCTION TIMING SOLENOID VALVE CONNECTOR FOR POOR CONNECTION
• Disconnect reduction timing solenoid valve connector.
• Check for poor connection (damaged, pulled-out, terminals, corrosion, etc.).
• Is terminal okay?
Yes
Go to next step.
No
Repair or replace terminal, then go to Step 12.
7
INSPECT RESISTANCE
• Check resistance between reduction timing solenoid valve connector terminal A (part side) and body ground.
• Is resistance within 14-18 ohms?
Yes
Repair or replace coupler component (10-pin), then go to Step 12.
No
Verify reduction timing solenoid valve installation.
• If reduction timing solenoid valve is installed correctly, replace reduction timing solenoid valve, then go to Step 12
8
INSPECT TCM CONNECTOR FOR POOR CONNECTION
• Disconnect TCM connector.
• Check for poor connection (damaged, pulled-out, terminals, corrosion, etc.).
• Are terminals okay?
Yes
Go to next step.
No
Repair terminals, then go to Step 12.
9
INSPECT TERMINAL COMPONENT NO.1 (12-PIN) CIRCUIT FOR OPEN CIRCUIT
• Check continuity between TCM terminal 2G (harness-side) and terminal component No.1 (12-pin) terminal E (harness-side).
• Is there continuity between terminals?
Yes
Go to next step.
No
Repair or replace harness, then go to Step 12.
10
INSPECT TERMINAL COMPONENT NO.1 (12-PIN) CIRCUIT FOR SHORT TO POWER
• Turn ignition key to ON (engine OFF).
• Check voltage at terminal component No.1 (12-pin) terminal E (harness-side).
• Is voltage 0 V?
Yes
Go to next step.
No
Repair or replace harness, then go to Step 12.
11
INSPECT TCM CIRCUIT FOR SHORT TO GROUND
• Turn ignition key to OFF.
• Check continuity between TCM terminal 2G (harness-side) and body ground.
• Is there any continuity?
Yes
Repair or replace harness, then go to next step.
No
Go to next step.
12
VERIFY TROUBLESHOOTING OF DTC P0763 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from memory using WDS or equivalent.
• Drive vehicle in D range and make sure that gears shift smoothly from 1GR to 5GR.
• Is same DTC present?
Yes
Replace TCM, then go to next step.
No
Go to next step.
13
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.