DTC Troubleshooting: P1879 (32-1)

DTC P1879:  Problem in CVT Start Clutch Pressure Control Valve Circuit

NOTE: Record all freeze data and review General Troubleshooting Information before you troubleshoot.

1.Disconnect CVT start clutch pressure control valve connector.

2.Measure the resistance between connector terminals at the control valve connector.

 

Is the resistance 3.8-6.8 W?


YES - Go to 3.


NO - Faulty the CVT start clutch pressure control valve, replace the control valve body.n


3.Disconnect PCM connectors B (24P) and C (22P).

4.Check for continuity between PCM connector terminal B16 and body ground, and between terminal C8 and body ground.

 

Is there continuity?


YES - Repair short to ground in the wire between PCM connector terminal B16 and the CVT start clutch pressure control valve connector, and between terminal C8 and the CVT start clutch pressure control valve connector.n


NO - Go to 5.


5.Reconnect CVT start clutch pressure control valve connector.

6.Measure the resistance between PCM connector terminals B16 and C8.

 

Is the resistance 3.8-6.8 W?


YES - Update the PCM if it does not have the latest software, or subsutitute a known-good PCM, then recheck. If the symptom/ indication goes away with a known-good PCM, replace the original  PCM.n


NO - Repair loose terminal or open in the wires between PCM connector terminals B16 and C8, and the CVT start clutch pressure control valve connector.n