Low Oil Pressure Indicator Circuit Troubleshooting (Open)
  1. Turn the ignition switch to ON (II).
  1. Make sure the HDS communicates with the vehicle and the engine control module (ECM). If it doesn't, troubleshoot the DLC circuit.
  1. Check for DTCs. If a DTC is present, diagnose, and repair the cause before continuing with this test.
  1. Turn the ignition switch to ON (II), select PGM-FI, and check the OIL PRESSURE SWITCH in the DATA LIST with the HDS.
Is ON indicated?
YES -
NO -
Go to Step 6 .
  1. Turn the ignition switch to LOCK (0).
Is the oil pressure switch OK?
YES -
Go to Step 8 .
NO -
  1. 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 from damage.
  1. Disconnect ECM connector B (49P) and the oil pressure switch connector.
  1. Check for continuity between ECM connector terminal B7 and the oil pressure switch connector.
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 the oil pressure switch and the ECM.■