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DTC P0778 [JA5A-EL]

BME050218901226

DTC P0778 | 2-4 brake solenoid valve circuit malfunction (open/short)
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DETECTION CONDITION | • If there is open or short circuit in the 2-4 brake solenoid signal system (while the TCM monitors the solenoid output voltage, the voltage that differs from the ON/OFF signal output by the CPU in the TCM is detected), the TCM determines that there is a malfunction. Diagnostic support note:
• This is continuous monitor (CCM).
• The MIL does not illuminates.
• PENDING CODE is not available.
• FREEZE FRAME DATA is not available.
• The HOLD indicator light flashes.
• The DTC is stored in the TCM memory.
POSSIBLE CAUSE | • Open circuit in wiring harness between 2-4 brake solenoid valve terminal A and TCM terminal 2V • Short to ground in wiring harness between 2-4 brake solenoid valve terminal A and TCM terminal 2V • Short to power supply in wiring harness between 2-4 brake solenoid valve terminal A and TCM terminal 2V
2-4 brake solenoid valve malfunction
• Damaged connector between 2-4 brake solenoid valve and TCM
• TCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Bulletins and/or on-line repair information availability. • Is any related repair information available? | Yes | Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
No | Go to the next step.
2 | INSPECT TERMINAL COMPONENT NO.1 (12-PIN) FOR POOR CONNECTION • Turn the ignition switch to the LOCK position. • Disconnect the terminal component No.1 (12-pin). • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Are the terminals normal? | Yes | Go to the next step.
No | Repair or replace the terminals, then go to Step 12.
3 | INSPECT RESISTANCE • Inspect the resistance between terminal component No.1 (12-pin) terminal A (transaxle case side) and body ground. • Is the resistance within 2.6-3.2 ohms? (See SOLENOID VALVE INSPECTION [JA5A-EL].) | Yes | Go to Step 8.
No | Go to the next step.
4 | INSPECT COUPLER COMPONENT (10-PIN) FOR POOR CONNECTION • Disconnect the coupler component (10-pin) connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is the terminal normal? | Yes | Go to the next step.
No | Repair or replace the terminal, then go to Step 12.
5 | INSPECT RESISTANCE • Inspect the resistance between coupler component (10-pin) terminal D (part side) and body ground. • Is the resistance within 2.6-3.2 ohms? (See SOLENOID VALVE INSPECTION [JA5A-EL].) | Yes | Repair or replace terminal component No.1 (12-pin), then go to Step 12.
No | Go to the next step.
6 | INSPECT 2-4 BRAKE SOLENOID VALVE CONNECTOR FOR POOR CONNECTION • Disconnect the 2-4 brake solenoid vale connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is the terminal normal? | Yes | Go to the next step.
No | Repair or replace the terminal, then go to Step 12.
7 | INSPECT RESISTANCE • Inspect the resistance between 2-4 brake solenoid valve connector terminal A (part side) and body ground. • Is the resistance within 2.6-3.2 ohms? (See SOLENOID VALVE INSPECTION [JA5A-EL].) | Yes | Repair or replace the coupler component (10-pin), then go to Step 12.
No | Verify the 2-4 brake solenoid valve installation. • If the 2-4 brake solenoid valve is installed correctly, replace the 2-4 brake solenoid valve, then go to Step 12 (See SOLENOID VALVE REMOVAL/INSTALLATION [JA5A-EL].)
8 | INSPECT TCM CONNECTOR FOR POOR CONNECTION • Disconnect the TCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Are the terminals normal? | Yes | Go to the next step.
No | Repair the terminals, then go to Step 12.
9 | INSPECT TERMINAL COMPONENT NO.1 (12-PIN) CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between TCM terminal 2V (wiring harness-side) and terminal component No.1 (12-pin) terminal A (wiring harness-side). • Is there continuity between the terminals? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to Step 12.
10 | INSPECT TERMINAL COMPONENT NO.1 (12-PIN) CIRCUIT FOR SHORT TO POWER SUPPLY • Turn the ignition switch to the ON position (engine off). • Inspect the voltage at terminal component No.1 (12-pin) terminal A (wiring harness-side). • Is the voltage 0 V? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to Step 12.
11 | INSPECT TCM CIRCUIT FOR SHORT TO GROUND • Turn the ignition switch to the LOCK position. • Inspect for continuity between TCM terminal 2V (wiring harness-side) and body ground. • Is there continuity? | Yes | Repair or replace the wiring harness, then go to the next step.
No | Go to the next step.
12 | VERIFY TROUBLESHOOTING OF DTC P0778 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the TCM memory using the WDS or equivalent. • Drive the vehicle in the D range and make sure that gears shift smoothly from 1GR to 5GR.
• Is the same DTC present?
Yes
Replace the TCM, then go to the next step.
(See TCM REMOVAL/INSTALLATION [JA5A-EL].)
No | Go to the next step.
13 | VERIFY AFTER REPAIR PROCEDURE • Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE [JA5A-EL].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [JA5A-EL].)
No | DTC troubleshooting completed.