DLC Circuit Troubleshooting (L15A)
DLC Circuit Troubleshooting
NOTE:Check that MIL circuit is normal, then do this troubleshooting.
| 1. | Turn the ignition switch ON (II). |
| 2. | Measure voltage between data link connector (DLC) terminal No. 16 and body ground.
 DATA LINK CONNECTOR (DLC)Terminal side of female terminals+B(WHT/RED) Is there battery voltage? YES - Go to 3. NO - Repair open in the wire between DLC terminal No. 16 and the No. 8 (15A) fuse in the under-hood fuse/relay box.n |
| 3. | Measure voltage between DLC terminals No. 4 and No. 16.
 DATA LINK CONNECTOR (DLC)GND (BLK)+B (WHT/RED)Terminal side of female terminalsIs there battery voltage? YES - Go to 4. NO - Repair open in the wire between DLC terminal No. 4 and body ground.n |
| 4. | Measure voltage between DLC terminals No. 5 and No. 16.
 DATA LINK CONNECTOR (DLC)LG (BRN/YEL)+B (WHT/RED)Terminal side of female terminalsIs there battery voltage? YES - Go to 5. NO - Repair open in the wire between DLC terminal No. 5 and ECM/PCM (E3).n |
| 5. | Measure voltage between DLC terminals No. 5 and No. 7.
 DATA LINK CONNECTOR (DLC)K-LINE(RED/WHT)LG (BRN/YEL)Terminal side of female terminals Is there 8.5 V or more? YES - Go to 10. NO - Go to 6. |
| 6. | Turn the ignition switch OFF. |
| 7. | Disconnect ECM/PCM connector E (31P). |
| 8. | Check for continuity between DLC terminal No. 7 and body ground.
 DATA LINK CONNECTOR (DLC)K-LINE(RED/WHT)Terminal side of female terminals 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 the DTC with the scan tool/Honda PGM Tester and go to the DTC Troubleshooting Index.n NO - Go to 9. |
| 9. | Check for continuity between DLC terminal No. 7 and ECM/PCM terminal E23.
 ECM/PCM CONNECTOR E (31P)DATA LINK CONNECTOR (DLC)Wire side offemale terminalsTerminal side of female terminalsK-LINE (RED/WHT)K-LINE (RED/WHT) 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.n NO - Repair open in the wire between DLC terminal No. 7 and the ECM/PCM (E23). After repairing the wire, check the DTC with the scan tool/Honda PGM Tester and go to the DTC Troubleshooting Index.n |
| 10. | Turn the ignition switch OFF. |
| 11. | Disconnect ECM/PCM connector E (31P). |
| 12. | Turn the ignition switch ON (II). |
| 13. | Measure voltage between DLC terminals No. 5 and No. 7.
 DATA LINK CONNECTOR (DLC)K-LINE(RED/WHT)LG (BRN/YEL)Terminal side of female terminals 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.n NO - Repair short to ground in the wire between DLC terminal No. 7 and the ECM/PCM (E23). After repairing the wire, check the DTC with the scan tool/Honda PGM Tester and go to the DTC Troubleshooting Index.n |