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.

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

Is there continuity?
YES - Repair short in the wires between electric vacuum pump relay 2 terminals No. 2 and No. 1.

NO - Go to step 6.






6. Jump the SCS line with the HDS.

7. Disconnect PCM connector A (44P).

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

9. Measure the voltage between body ground and PCM connector A (44P) terminal No. 12.

Is there any voltage?
YES - Repair 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, 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