DTC Troubleshooting: P0840 (25-2)

DTC P0840:  Problem in 2nd Clutch Pressure Switch Circuit

NOTE: Record all freeze data before you troubleshoot.

1.Disconnect the 2nd clutch pressure switch.

2.Turn the ignition switch ON (II).

3.Measure the voltage between PCM connector terminal C13 and body ground.

 

Is there about 5 V?


YES - Go to 4.


NO - Check for a short to ground in the wire between PCM connector terminal C13 and the 2nd clutch pressure switch. If wire is OK, check for loose terminal fit in the PCM connectors. If necessary, substitute a known-good  PCM and recheck.n

4.Measure the voltage between the 2nd clutch pressure switch connector terminal and body ground.

 

Is there about 5 V?


YES - Go to 5.


NO - Repair open in the wire between PCM connector terminal C13 and the 2nd clutch pressure switch.n


5.Turn the ignition switch OFF.

6.Measure the resistance between the 2nd clutch pressure switch connector terminal and body ground.

 

Is there 40 MW or more?


YES - Go to 7.


NO - Replace the 2nd clutch pressure switch.n

7.Connect the 2nd clutch pressure switch connector.

8.Raise the front of the vehicle, make sure it is securely supported, and allow the front wheels to rotate freely.

9.Start the engine, and shift into [2] position.

10.Drive the vehicle in 2nd gear for more than five seconds.

11.With driving in [2] position, measure the voltage between PCM connector terminal C13 and body ground.

 

Is there 0 V?


YES - Check for loose terminal fit in the PCM connectors. If necessary, substitute a known-good  PCM and recheck.n


NO - Replace the 2nd clutch pressure switch.n