Data Link Connector: Testing and Inspection
DLC Circuit TroubleshootingIf the ECM does not communicate with the HDS, do this troubleshooting procedure.
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.9 BACKUP (10 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.
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 DLC terminal No.5 and the ECM (E3).
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. Wait for 1 minute. If the radiator fan is running, wait for 1 minute after it stops.
8. Disconnect ECM 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 (E23). After repairing the wire, check for Temporary DTCs or DTCs with the HDS. If there are Temporary DTCs or DTCs, go to the indicated DTC's troubleshooting.
NO - Go to step 10.
10. Check for continuity between DLC terminal No.7 and ECM terminal E23.
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 the ECM (E23). After repairing the wire, check for Temporary DTCs or DTCs with the HDS. If there are Temporary DTCs or DTCs, go to the indicated DTC's troubleshooting.
11. Turn the ignition switch OFF.
12. Wait for 1 minute. If the radiator fan is running, wait for 1 minute after it stops.
13. Disconnect ECM 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 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 the ECM (E23). After repairing the wire, check for Temporary DTCs or DTCs with the HDS. If there are Temporary DTCs or DTCs, go to the indicated DTC's troubleshooting.