DLC Circuit Troubleshooting

NOTE:

- If the ECM/PCM does not communicate with the HDS, 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. 8 FI ECU (ECM/PCM) (15 A) fuse in the under-hood fuse/relay box.■

1. 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 (G451).■

1. 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.■

1. Turn the ignition switch ON (II).

1. 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 .

1. Turn the ignition switch OFF.

1. Jump the SCS line with the HDS.

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

1. 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 and go to the DTC's troubleshooting.■
NO | - | Go to Step 10 .

1. Check for continuity between DLC terminal No. 7 and ECM/PCM connector 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 and go to the DTC's troubleshooting.■

1. Turn the ignition switch OFF.

1. Jump the SCS line with the HDS.

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

1. Turn the ignition switch ON (II).

1. 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, and go to the DTC's troubleshooting.■