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. 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.■

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).■

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.■
Turn the ignition switch ON (II). |

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

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 .

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.■
Turn the ignition switch OFF. Jump the SCS line with the HDS. Disconnect ECM/PCM connector E (31P). Turn the ignition switch ON (II). |

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.■