Civic L4-1.8L CNG (2008)
Oil Pressure Warning Lamp/Indicator: Testing and Inspection
Low Oil Pressure Indicator Circuit Troubleshooting (Short)
Low Oil Pressure Indicator Circuit Troubleshooting (Short)
1. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC).
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle and the engine control module (ECM)/powertrain control module (PCM). If it doesn't
communicate, troubleshoot the DLC circuit.
4. Check for DTCs. If a DTC is present, diagnose, and repair the cause before continuing with this test.
5. Start the engine, select PGM-FI, and check the OIL PRESSURE SWITCH in the DATA LIST with the HDS.
Is "OFF" indicated?
YES - Replace the gauge control module (tach).
NO - Go to step 6.
6. Turn the ignition switch to LOCK (0).
7. Disconnect the oil pressure switch connector.
8. Start the engine, and check the OIL PRESSURE SWITCH in the DATA LIST with the HDS.
Is "OFF" indicated?
YES - Go to step 9.
NO - Go to step 11.
9. Turn the ignition switch to LOCK (0).
10. Check the oil pressure switch.
Is the oil pressure switch OK?
YES - Do the oil pressure test.
NO - Replace the oil pressure switch.
11. Turn the ignition switch to ON (II), and jump the SCS line with the HDS, then turn the ignition switch to LOCK (0).
NOTE: This step must be done to protect the ECM/PCM from damage.
12. Disconnect ECM/PCM connector B (44P) and the oil pressure switch connector.
13. Check for continuity between the oil pressure switch connector and body ground.
Is there continuity?
YES - Repair short to ground in the wire between the oil pressure switch and the ECM/PCM.
NO - 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.
