DLC Circuit Troubleshooting

NOTE: Check that MIL circuit is normal, then do this troubleshooting.

1.Turn the ignition switch ON (II).

2.Measure voltage between data link connector (DLC) terminal No. 16 and body ground.

 

Is there battery voltage?


YES - Go to 3.


NO - Repair open in the wire between DLC terminal No. 16 and the No. 8 (15A) fuse in the under-hood fuse/relay box.n


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

 

Is there battery voltage?


YES - Go to 4.


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

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

 

Is there battery voltage?


YES - Go to 5.


NO - Repair open in the wire between DLC terminal No. 5 and ECM/PCM (E3).n


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

 

Is there 8.5 V or more?


YES - Go to 10.


NO - Go to 6.


6.Turn the ignition switch OFF.

7.Disconnect ECM/PCM connector E (31P).

8.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 the DTC with the HDS or the scan tool and go to the DTC Troubleshooting Index.n


NO - Go to 9.


9.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.n


NO - Repair open in the wire between DLC terminal No. 7 and the ECM/PCM (E23). After repairing the wire, check the DTC with the HDS or the scan tool and go to the DTC Troubleshooting Index.n


10.Turn the ignition switch OFF.

11.Disconnect ECM/PCM connector E (31P).

12.Turn the ignition switch ON (II).

13.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.n


NO - Repair short to ground in the wire between DLC terminal No. 7 and the ECM/PCM (E23). After repairing the wire, check the DTC with the HDS or the scan tool and go to the DTC Troubleshooting Index.n