P16DB

DTC Troubleshooting: P16DB

DTC P16DB: Electric Vacuum Pump Relays 1 and 2 Signal Circuit Malfunction

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

2. Check the No. 31 (7.5 A) fuse in the auxiliary under-hood fuse/relay box.

Is the fuse blown?
YES - Repair short in the wire between the electric vacuum pump relays 1 and 2 and the No. 31 (7.5 A) fuse in the auxiliary under-hood fuse/relay box. Replace the No. 31 (7.5 A) fuse and recheck.

NO - Remove the fuse, then go to step 3.


3. Remove electric vacuum pump relay 1.

4. 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 5.

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






5. Jump the SCS line with the HDS.

6. Disconnect PCM connector A (44P).

7. Check for continuity between the No. 31 (7.5 A) fuse in auxiliary under-hood fuse/relay box terminal No. 2 and PCM connector A (44P) terminal No. 13.

Is there continuity?
YES - Check for loose terminals in PCM connector A (44P), then update the PCM if it does not have the latest software, 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 open in the wire between the No. 31 (7.5 A) fuse in the auxiliary under-hood fuse/relay box and the PCM.