STEP 1. Check harness connector B-13 at engine oil pressure switch for damage.
STEP 2. Measure the power supply voltage at engine oil pressure switch harness side connector B-13.
(1) Disconnect the connector B-13 and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.- Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is battery positive voltage (approximately 12 volts) present?
Go to Step 6. Go to Step 3.
STEP 3. Check harness connector B-26 at ECM for damage.
STEP 4. Check for open circuit and short circuit to ground between ECM connector B-26 (terminal No. 36) and engine oil pressure switch connector B-13 (terminal No. 1)
STEP 5. Using scan tool MB991958, check data list item 90: Engine Oil Pressure Switch.
caution | To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. |
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode for item 90, Engine Oil Pressure Switch.- When the engine is stopped, "ON" should be displayed.
- When the engine is idling, "OFF" should be displayed.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/ Inspection Service Points - How to Cope with Intermittent Malfunctions . Replace the ECM (Refer to, Removal and Installation ). Then confirm that the malfunction symptom is eliminated.
STEP 6. Check harness connector B-26 at ECM for damage.
STEP 7. Check for harness damage between ECM connector B-26 (terminal No. 36) and engine oil pressure switch connector B-13 (terminal No. 1)