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 in the electric vacuum pump relay 1 connector (4P), the electric vacuum pump 2P connector, and PCM connector B (44P), then update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM Initial Inspection and Diagnostic Overview, 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.�