Data Link Connector: Testing and Inspection
DLC Circuit TroubleshootingNOTE:
- 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.
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 (G503).
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 body ground (G503).
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. Jump the SCS line with the HDS.
8. Disconnect ECM/PCM 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/PCM (A14). After repairing the wire, check for a DTC with the HDS and go to the indicated DTC's Troubleshooting.
NO - Go to step 10.
10. Check for continuity between DLC terminal No.7 and ECM/PCM terminal A14.
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 (A14). After repairing the wire, check for Temporary DTCs or DTCs with the HDS and go to the indicated DTC's Troubleshooting.
11. Turn the ignition switch OFF.
12. Jump the SCS line with the HDS.
13. Disconnect ECM/PCM connector A (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/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 - Go to step 16.
16. Turn the ignition switch OFF.
17. Disconnect the VSA control unit 47P connector.
18. Check for continuity between VSA control unit 47P connector terminal No.32 and body ground.
Is there continuity?
YES - Repair short to power in the wire between DLC terminal No.7 and the ECM/PCM (A14). After repairing the wire, check for Temporary DTCs or DTCs with the HDS. If any Temporary DTCs or DTCs are indicated, go to the indicated DTC's Troubleshooting.
NO - Repair open in the wire between the VSA control unit and G203. After repairing the wire, check for Temporary DTCs or DTCs with the HDS. If any Temporary DTCs or DTCs are indicated, go to the indicated DTC's Troubleshooting.