Pinpoint Test BF: The Low Oil Pressure Warning Indicator Is Never/Always On (With Optional Gauge Pack)

Instrumentation, Message Center and Warning Chimes

Pinpoint Test BF: The Low Oil Pressure Warning Indicator Is Never/Always On (With Optional Gauge Pack)

Refer to Wiring Diagram Set 60, Instrument Cluster for schematic and connector information [1][2]Diagrams By Number.

Normal Operation

The Instrument Panel Cluster (IPC) provides a reference voltage to the oil pressure gauge. When the oil pressure is within normal ranges, the oil pressure switch closes to ground, pulling the reference voltage low in the IPC (Instrument Panel Cluster). The IPC (Instrument Panel Cluster) senses the low reference voltage and turns off the low oil pressure warning indicator. When the engine oil pressure is low, the oil pressure gauge opens the circuit, sending the reference voltage high in the IPC (Instrument Panel Cluster). The IPC (Instrument Panel Cluster) senses the high voltage and turns the low oil pressure warning indicator on.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Oil pressure gauge

- Base engine oil pressure concern

- IPC (Instrument Panel Cluster)

PINPOINT TEST BF : THE LOW OIL PRESSURE WARNING INDICATOR IS NEVER/ALWAYS ON (WITH OPTIONAL GAUGE PACK)

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

BF1 CARRY OUT THE IPC (Instrument Panel Cluster) INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: IPC (Instrument Panel Cluster) DataLogger.

- Select the IPC (Instrument Panel Cluster) low oil pressure warning indicator (OIL_P_LOW) active command. Command the low oil pressure warning indicator on and off while observing the low oil pressure warning indicator.

Does the low oil pressure warning indicator illuminate when commanded on, and turn off when commanded off?

Yes
GO to BF2.

No
INSTALL a new IPC (Instrument Panel Cluster). REFER to Instrument Panel Cluster (IPC) . TEST the system for normal operation.

BF2 CHECK THE OIL PRESSURE GAUGE OPERATION

- Start the engine.

- Observe the oil pressure gauge operation.

Does the oil pressure gauge operate correctly?

Yes
If the low oil pressure warning indicator is never on, GO to BF3.

If the low oil pressure warning indicator is always on, GO to BF4.

No
GO to Pinpoint Test M Pinpoint Test M: The Low Oil Pressure Warning Indicator Is Never/Always On.

BF3 CHECK THE OIL PRESSURE INPUT CIRCUIT FOR A SHORT TO GROUND

- Ignition OFF.

- Disconnect: Oil Pressure Gauge C2226.

- Disconnect: IPC (Instrument Panel Cluster) C220.

- Measure the resistance between the IPC (Instrument Panel Cluster) C220-5, circuit CMC24 (GY), harness side and ground.





Is the resistance greater than 10,000 ohms?

Yes
INSTALL a new oil pressure gauge. TEST the system for normal operation.

No
REPAIR the circuit. TEST the system for normal operation.

BF4 CHECK OIL PRESSURE GAUGE INPUT

- Ignition OFF.

- Disconnect: Oil Pressure Gauge C2226.

- Connect a fused jumper wire between the oil pressure gauge, C2226-5, circuit CMC24 (GY), harness side and ground.





- Ignition ON.

- Observe the low oil pressure warning indicator.

Does the low oil pressure warning indicator turn off?

Yes
INSTALL a new oil pressure gauge. TEST the system for normal operation.

No
LEAVE the jumper wire connected. GO to BF5.

BF5 CHECK THE OIL PRESSURE INPUT CIRCUIT FOR AN OPEN

- Ignition OFF.

- Disconnect: IPC (Instrument Panel Cluster) C220.

- With the jumper wire in place, measure the resistance between the IPC (Instrument Panel Cluster) C220-5, circuit CMC24 (GY), harness side and ground.





Is the resistance less than 5 ohms?

Yes
REMOVE the jumper wire. GO to BF6.

No
REMOVE the jumper wire. REPAIR the circuit. TEST the system for normal operation.

BF6 CHECK FOR CORRECT IPC (Instrument Panel Cluster) OPERATION

- Disconnect the IPC (Instrument Panel Cluster) connector.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect the IPC (Instrument Panel Cluster) connector and make sure it seats correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new IPC (Instrument Panel Cluster). REFER to Instrument Panel Cluster (IPC) . TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.