D4 Switch Circuit Troubleshooting (6-Speed A/T)

D4 Switch Circuit Troubleshooting

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

2. Disconnect the D4 switch connector, and test the D4 switch D4 Switch Test (6-Speed A/T).

Does the switch test OK?

YES -

Go to step 3.

NO -

Replace the D4 switch D4 Switch Replacement (6-Speed A/T).

3. Turn the ignition switch to ON (II).

4. Measure the voltage between D4 switch connector terminals No. 1 and No. 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 and recheck. If the symptom goes away with a known-good PCM, replace the original PCM Service and Repair.

NO -

Go to step 5.

5. Turn the ignition switch to LOCK (0).

6. Check for continuity between D4 switch connector terminal No. 1 and body ground.





Is there continuity?

YES -

Go to step 7.

NO -

Repair an open in the wire between D4 switch connector terminal No. 1 and body ground (G403), or repair poor body ground (G403).

7. Turn the ignition switch to LOCK (0).

8. Jump the SCS line with the HDS.

9. Disconnect PCM connector A (49P).

10. Check for continuity between D4 switch connector terminal No. 2 and body ground.





Is there continuity?

YES -

Repair a short to body ground in the wire between PCM connector terminal A17 and D4 switch connector terminal No. 2.

NO -

Go to step 11.

11. Check for continuity between D4 switch connector terminal No. 2 and PCM connector terminal A17.





Is there continuity?

YES -

Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM 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 wire between PCM connector terminal A17 and D4 switch connector terminal No. 2.