D3 Switch Circuit Troubleshooting

Trans/Driveline

D3 Switch Circuit Troubleshooting

1. D3 switch check:

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connector.






-3. Test the D3 switch Testing and Inspection.

Does the switch test OK?
-YES- The D3 switch is OK. Go to step 2.
-NO- Replace the D3 switch Service and Repair.

2. Problem verification:

-1. Turn the ignition switch to ON (II).

-2. Measure the voltage between test points 1 and 2.










Is there battery voltage?
-YES- Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM Service and Repair, and recheck. If the symptom goes away with a known-good PCM, replace the original PCM Service and Repair.
-NO- The failure is duplicated. Go to step 3.

3. Open wire check (D3 SW line):

-1. Turn the ignition switch to LOCK (0).

-2. Check for continuity between test points 1 and 2.










Is there continuity?
-YES- The D3 SW wire is OK. Go to step 4.
-NO- Repair an open in the D3 SW wire between the D3 switch 2P connector and ground (G502), or repair poor ground (G502).

4. Shorted wire check (D3 SW line):

-1. Jump the SCS line with the HDS.

-2. Disconnect the following connector.






-3. Check for continuity between test points 1 and 2.










Is there continuity?
-YES- Repair a short to ground in the D3 SW wire between the D3 switch 2P connector and the PCM.
-NO- The D3 SW wire is not shorted. Go to step 5.

5. Open wire check (D3 SW/OD SW line):

-1. Check for continuity between test points 1 and 2.










Is there continuity?
-YES- The D3 SW/OD SW wire is OK. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM Service and Repair, and recheck. If the symptom goes away with a known-good PCM, replace the original PCM Service and Repair.
-NO- Repair an open in the D3 SW/OD SW wire between the D3 switch 2P connector and the PCM.