| 1. | Connect the Honda Diagnostic System (HDS) to the data link connector (DLC). |
| 2. | Turn the ignition switch ON (II). |
| 3. | Make sure the HDS communicates with the vehicle and the ECM/PCM. If it doesn't, troubleshoot the DLC circuit. |
| 4. | Check for DTCs. If a DTC is present, diagnose, and repair the cause before continuing with this test. |
| 5. | Turn the ignition switch ON (II), select PGM-FI, and check the OIL PRESSURE SWITCH in the DATA LIST with the HDS. Is ‘‘ON'' indicated? YES - Replace the gauge control module (tach).n NO - Go to 6. |
| 6. | Check the oil pressure switch. Is the oil pressure switch OK? YES - Go to 7. NO - Replace the oil pressure switch.n |
| 7. | Turn the ignition switch ON (II), and jump the SCS line with the HDS, then turn the ignition switch OFF. NOTE: This step must be done to protect the engine control module (ECM)/powertrain control module (PCM) from damage. |
| 8. | Disconnect ECM/PCM connector B (44P) and the oil pressure switch connector. |
| 9. | Check for continuity between ECM/PCM connector terminal B7 and the oil pressure switch connector.
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 an open in the wire between the oil pressure switch and the ECM/PCM.n |