Engine Oil Pressure: Testing and Inspection

Oil Pressure Diagnosis and Testing

Special Tools
* EN-498-B - Oil Pressure Gauge
* EN-498-3 - Adapter

For equivalent regional tools, refer to Special Tools

Removal Procedure

1. Disconnect the oil pressure indicator switch wiring harness plug.


2. Remove the oil pressure indicator switch and the oil pressure indicator switch seal ring.

Measuring Procedure

1. Install EN-498-B - gauge (1) along with EN-498-3 - adapter (2).
2. Start Engine.

Note: The oil temperature should be between 80°C and 100°C.

3. Measure the oil pressure:

* The oil pressure at idle speed should be 150kpa (22 psi).
* The oil pressure between 3000 - 3500 rpm should be 380 - 650 kPa (55 - 94 psi).

4. Stop engine.
5. If the engine oil pressure is below specifications, inspect the engine for 1 or more of the following conditions:

* Oil pump worn or dirty.
* Oil suction gallery clogged or dirty.
* Cracked, porous, or restricted oil galleries.
* Oil pressure relief valve malfunction.

6. Remove EN-498-B - gauge and EN-498-3 - adapter.

Installation Procedure

1. Install the oil pressure indicator switch and a NEW oil pressure indicator switch seal ring.

Caution: Refer to Fastener Caution.

2. Tighten the oil pressure indicator switch to 20 Nm (15 lb ft).