Symptom Troubleshooting

Engine Lubrication System Symptom Troubleshooting - Low oil pressure indicator stays on

Special Tools Required

- Oil Pressure Hose 07ZAJ-S5AA200
- A/T Low Pressure Gauge w/Panel 07406-0070301
- A/T Pressure Test Hose 07AAJ-PY4A100
- A/T Pressure Adapter 07MAJ-PY40120
- Pressure Gauge Adapter 07NAJ-P07010A

Low oil pressure indicator stays on

J35Z2 engine

1. Connect the HDS to the DLC.

2. Turn the ignition switch to ON (II).

3. Make sure the HDS communicates with the vehicle and the PCM. If it does not communicate, troubleshoot the DLC circuit Testing and Inspection.

4. Check for DTCs Initial Inspection and Diagnostic Overview. If a DTC is present, diagnose, and repair the cause before continuing with this test.

5. Check the engine oil level Testing and Inspection.

Is the engine oil level normal?

YES -

Go to step 6.

NO -

Add engine oil to the normal level, then recheck.

6. Remove the rocker arm oil pressure sensor Service and Repair.

7. Install the oil pressure hose, the A/T low pressure gauge w/panel, the A/T pressure test hose, and the A/T pressure adapter as shown, then install the rocker arm oil pressure sensor to the pressure gauge adapter.






8. Allow the engine to reach operating temperature (fan comes on at least twice).

9. With the engine idling, check the oil pressure gauge.

Does it read 70 kPa (0.7 kgf/cm2, 10 psi) or less?

YES -

Check the following items:

- Blocking of oil filter.
- Blocking of oil strainer.
- Inspect the oil pressure relief valve Service and Repair.
- Check the oil pump.

NO -

Go to step 10.

10. Check the ROCKER ARM OIL PRESSURE SENSOR in the PGM-FI DATA LIST with the HDS.

Is the 19.0 kPa (0.19 kgf/cm2, 2.76 psi) or less?

YES -

Go to step 14.

NO -

Go to step 11.

11. Jump the SCS line with the HDS, then turn the ignition switch to LOCK (0).

NOTE: This step must be done to protect the PCM from damage.

12. Disconnect PCM connector C (49P).

13. Turn the ignition switch to ON (II).

Does the low oil pressure indicator go off?

YES -

Update the PCM if it does not have the latest software ECM/PCM Update, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM Service and Repair.

NO -

Replace the gauge control module .

14. Check the difference between the MAP SENSOR and BARO SENSOR in the PGM-FI DATA LIST with HDS.

Is difference between the sensor readings 19.9 kPa (0.20 kgf/cm2, 2.89 psi) or less?

YES -

Replace the rocker arm oil pressure sensor Service and Repair.

NO -

Replace the PCM Service and Repair.