P0778
DTC P0778: Problem in A/T Clutch Pressure Control Solenoid Valve B CircuitNOTE: Record all freeze data before you troubleshoot.
1. Disconnect the A/T clutch pressure control solenoid valve B connector.
2. Measure A/T clutch pressure control solenoid valve B resistance at the solenoid valve connector terminals.
Is there about 5 ohms?
YES - Go to step 3.
NO - Replace the A/T clutch pressure control solenoid valve B.
3. Disconnect PCM connectors B (24P) and C (22P).
4. Check for continuity between PCM connector terminals B16 and body ground, and between C8 and body ground.
Is there continuity?
YES - Repair short to ground in the wires between PCM connector terminals B16 and the A/T clutch pressure control solenoid valve B. and between C8 and the solenoid valve B.
NO - Go to step 5.
5. Connect the A/T clutch pressure control solenoid valve B connector.
6. Measure the resistance between PCM connector terminals B16 and C8.
Is there about 5 ohms?
YES - Go to step 7.
NO - Repair loose terminal or open in the wires between PCM connector terminals B16 and the A/T clutch pressure control solenoid valve B. and between C8 and the solenoid valve B.
7. Disconnect PCM connector A (31P).
8. Check for continuity between PCM connector terminals A23 and body ground, and between A24 and body ground.
Is there continuity?
YES - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM.
NO - Repair open in the wires between PCM connector terminals A23 and ground (G101), and between A24 and ground (G101), and repair poor ground (G101).