P16DA

DTC Troubleshooting: P16DA

DTC P16DA:

Electric Vacuum Pump Relay 1 Stuck OFF

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

2. Check the No. 17 (15 A) fuse in the under-hood fuse/relay box.

Is the fuse blown?

YES -

Repair a short in the wire between electric vacuum pump relay 1 and the No. 17 (15 A) fuse in the under-hood fuse/relay box. Replace the No. 17 (15 A) fuse, and recheck.

NO -

Reinstall the fuse, then go to step 3.

3. Remove electric vacuum pump relay 1, and check it Testing and Inspection.

Is the relay OK?

YES -

Go to step 4.

NO -

Replace electric vacuum pump relay 1.

4. Measure the voltage between body ground and electric vacuum pump relay 1 terminal No. 2.





Is there battery voltage?

YES -

Go to step 5.

NO -

Repair an open in the wire between electric vacuum pump relay 1 and the No. 17 (15 A) fuse in the under-hood fuse/relay box.

5. Remove the No. 31 (7.5 A) fuse from the auxiliary under-hood fuse/relay box.

6. Check for continuity between electric vacuum pump relay 1 terminal No. 1 and the No. 31 (7.5 A) fuse in auxiliary under-hood fuse/relay box terminal No. 1.





Is there continuity?

YES -

Go to step 7.

NO -

Repair an open in the wire between electric vacuum pump relay 1 and the No. 31 (7.5 A) fuse in the auxiliary under-hood fuse/relay box.

7. Check for continuity between electric vacuum pump relay 1 terminal No. 3 and body ground.





Is there continuity?

YES -

Go to step 8.

NO -

Repair an open in the wire between electric vacuum pump relay 1 and body ground (G201).

8. Short the SCS line with the HDS.

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

10. Check for continuity between electric vacuum pump relay 1 terminal No. 4 and PCM connector B (44P) terminal No. 34.





Is there continuity?

YES -

Check for loose terminals and poor connections between the electric vacuum pump relay 1, the electric vacuum pump, and the PCM, then 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.

NO -

Repair an open in the wire between electric vacuum pump relay 1 and the PCM.