P16DB

DTC P16DB: Electric Vacuum Pump Relay 1/2 Signal Circuit Malfunction

1. Turn the ignition switch OFF.
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 relay 1/2 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 No. 31 (7.5 A) fuse in the 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 No. 31 (7.5 A) fuse in the auxiliary under-hood fuse/relay box.

5. Short the SCS line with the HDS.
6. Disconnect PCM connector A (44P).
7. Check for continuity between No. 31 (7.5 A) fuse in the 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.

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.