DLC Circuit Troubleshooting

NOTE:

- If the ECM does not communicate with 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 No. 8 FI ECU (ECM) (20 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 DLC terminal No. 5 and body ground (G451).■

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. Turn the ignition switch OFF, and wait 30 seconds.

1. Disconnect ECM connector No. 2 (58P).

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 ECM connector No. 2 terminal No. 31. After repairing the wire, check for a DTC with the HDS and go to the indicated DTC's troubleshooting.■
NO | - | Go to Step 10 .

1. Check for continuity between DLC terminal No. 7 and ECM connector No. 2 terminal No. 31.

Is there continuity?

YES | - | Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM. ■
NO | - | Repair open in the wire between DLC terminal No. 7 and ECM connector No. 2 terminal No. 31. After repairing the wire, check for a DTC with the HDS and go to the indicated DTC's troubleshooting.■

1. Turn the ignition switch OFF, and wait 30 seconds.

1. Disconnect ECM connector No. 2 (58P).

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 if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM. ■
NO | - | Repair short to power in the wire between DLC terminal No. 7 and ECM connector No. 2 terminal No. 31. After repairing the wire, check for a DTC with the HDS, and go to the indicated DTC's troubleshooting.■