Data Link Connector: Testing and Inspection

DLC Circuit Troubleshooting

NOTE:
- If the ECM/PCM does not communicate with the HDS, do this troubleshooting procedure.
- Check that the 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. 8 FI ECU (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 (G501).




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 the ECM/PCM (E3) and DLC terminal No. 5.

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 11.

NO - Go to step 6.

6. Turn the ignition switch OFF.
7. Jump the SCS line with the HDS.
8. Disconnect ECM/PCM connector E (31P).




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 ECM/PCM (E23). After repairing the wire, check for a DTC with the HDS, then go to the indicated DTC's troubleshooting.

NO - Go to step 10.




10. Check for continuity between DLC terminal No. 7 and ECM/PCM terminal E23.

Is there continuity?

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

NO - Repair open in the wire between DLC terminal No. 7 and the ECM/PCM (E23). After repairing the wire, check for a DTC with the HDS, then go to the indicated DTC's troubleshooting.

11. Turn the ignition switch OFF.
12. Jump the SCS line with the HDS.
13. Disconnect ECM/PCM connector E (31P).
14. Turn the ignition switch ON (II).




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

Is there 0 V?

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

NO - Repair short to power in the wire between DLC terminal No. 7 and the ECM/PCM (E23). After repairing the wire, check for a DTC with the HDS, then go to the indicated DTC's troubleshooting.