E: Oil Pressure Reads Inaccurately

Pinpoint Test E - Oil Pressure Reads Inaccurately

E1 - Check Power At Cluster Circuit 640 (R/Y)

- Turn ignition switch to the OFF position.
- Partially remove instrument cluster.
- Turn ignition switch to RUN position.
- Using a multimeter check for voltage at cluster connector pin C2-6, circuit 231 (BK/Y).

Is B+ present?

YES GO to E2.
NO GO to Pinpoint Test B. B: Integrated Circuit Display(s) Inoperative Or Erratic

E2 - Test Oil Pressure Sensor Circuit At Low

- Place ignition switch in the RUN position with engine OFF. Observe gauge performance.

Does gauge read "L" or below?

YES GO to E3.
NO GO to E4.

E3 - Check Gauge Response

- Disconnect oil pressure sensor and short the lead to engine ground. Does gauge indicate mid-scale or slightly above mid-scale?

YES REPLACE oil pressure sensor. RESTORE vehicle. RETEST system.
NO GO to E4.

E4 - Check Circuit 31 (W/R) For Open Circuit

- Leave oil pressure input circuit shorted to ground.
Turn ignition switch to the OFF position. Remove instrument cluster as outlined.
- Using an multimeter connected to a known good ground, connect second lead to connector pin C2-7.
- Measure resistance.

Is resistance 5 ohms or less?

YES GO to E5.
NO SERVICE circuit 31 (W/R) for open circuit. RESTORE vehicle. RETEST system.

E5 - Check Oil Pressure Gauge

- Disconnect instrument cluster connectors.
Using an multimeter check gauge for continuity at contact clips.

Is there continuity at all clips?

YES GO to E6.
NO REPLACE oil pressure gauge. RESTORE vehicle. RETEST system.

E6 - Check Flex Circuit

- Reconnect cluster connectors.

Connector Pin Circuit Circuit Function
C2-6 231 (BK/Y) Ignition Voltage
C2-8 676 (PK/O) Gauge Ground
C2-7 31 (W/R) Oil Pressure Input

- Using an multimeter check for continuity from gauge contact clips to cluster connectors per chart.

Is there continuity at all circuits?

YES REPLACE oil pressure gauge. RESTORE vehicle. RETEST system.
NO REPLACE flex circuit. RESTORE vehicle. RETEST system.