P16DC

DTC Troubleshooting: P16DC

DTC P16DC:

Electric Vacuum Pump Relay 2 Stuck ON

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

2. Remove electric vacuum pump relay 2, and check it Testing and Inspection.

Is the relay OK?

YES -

Go to step 3.

NO -

Replace electric vacuum pump relay 2.

3. Remove the No. 17 (15 A) fuse from the under-hood fuse/relay box.

4. Disconnect the electric vacuum pump 2P connector Service and Repair.

5. Check for continuity between electric vacuum pump relay 2 terminals No. 1 and No. 2.





Is there continuity?

YES -

Repair a short in the wires between electric vacuum pump relay 2 terminals No. 1 and No. 2.

NO -

Go to step 6.

6. Short the SCS line with the HDS.

7. Disconnect PCM connector B (44P) Service and Repair.

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

9. Measure the voltage between PCM connector B (44P) terminal No. 34 and body ground.





Is there any voltage?

YES -

Repair a short to power in the wire between electric vacuum pump relays 1 and 2 and the PCM.

NO -

Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM, then go to step 1 and recheck. If no DTCs are indicated, and the PCM was substituted, replace the original PCM Service and Repair.