P16DA
DTC P16DA: Electric Vacuum Pump Relay 1 Stuck OFF1. Turn the ignition switch OFF.
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 the 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 the relay.
Is electric vacuum pump relay 1 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 in the auxiliary under-hood fuse/relay box.
6. 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 7.
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.
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. Short 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.
NO-Repair open in the wire between electric vacuum pump relay 1 and the PCM.