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 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 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 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 body ground and electric vacuum pump relay 1 terminal No. 3.

Is there continuity?
YES - Go to step 8.

NO - Repair open in the wire between electric vacuum pump relay 1 and body ground (G201).






8. Jump the SCS line with the HDS.

9. Disconnect PCM connector A (44P).

10. Check for continuity between electric vacuum pump relay 1 terminal No. 4 and PCM connector A (44P) terminal No. 12.

Is there continuity?
YES - Check for loose terminals in the electric vacuum pump relay 1 4P connector, the electric vacuum pump 2P connector, and 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 electric vacuum pump relay 1 and the PCM.