Data Link Connector: Testing and Inspection

DLC Circuit Troubleshooting

NOTE:
- If the PCM does not communicate with the HDS, or I/M test equipment, do this troubleshooting procedure.
- Check that MIL circuit is normal, then do this troubleshooting.




1. Measure voltage between DLC terminal No.16 and body ground.

Is there battery voltage?

YES - Go to step 2.

NO - Repair open in the wire between DLC terminal No.16 and the No.46 ACGS (15 A) fuse in the under-hood fuse/relay box.




2. Measure voltage between DLC terminals No.4 and No.16.

Is there battery voltage?

YES - Go to step 3.

NO - Repair open in the wire between DLC terminal No.4 and body ground (G401).




3. Measure voltage between DLC terminals No.5 and No.16.

Is there battery voltage?

YES - Go to step 4.

NO - Repair open in the wire between DLC terminal No.5 and body ground (G101).

4. Turn the ignition switch ON (II).




5. Measure voltage between DLC terminals No.5 and No.7.

Is there 8.5 V or more?

YES - Go to step 12.

NO - Go to step 6.

6. Turn the ignition switch OFF.
7. Jump the SCS line with the HDS.
8. Disconnect PCM connector B (56P).




9. Check for continuity between DLC terminal No.7 and body ground.

Is there continuity?

YES - Repair short to ground in the wire between DLC terminal No.7 and the PCM (B17). After repairing the wire, check for a DTC with the HDS, and go to the DTC Troubleshooting Index. Diagnostic Trouble Code Descriptions

NO - Go to step 10.




10. Connect the DLC terminal No.7 to body ground with a jumper wire.




11. Check for continuity between DLC terminal No.7 and PCM terminal B17.

Is there continuity?

YES - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM.

NO - Repair open in the wire between DLC terminal No.7 and the PCM (B17). After repairing the wire, check for a DTC with the HDS, and go to the DTC Troubleshooting Index. Diagnostic Trouble Code Descriptions

12. Turn the ignition switch OFF.
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector B (56P).
15. Turn the ignition switch ON (II).




16. Measure voltage between DLC terminals No.4 and No.7.

Is there 0 V?

YES - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM.

NO - Repair short to power in the wire between DLC terminal No.7 and the PCM (B17). After repairing the wire, check for a DTC with the HDS, and go to the DTC Troubleshooting Index. Diagnostic Trouble Code Descriptions