Refer to Instrument Cluster Analog Schematics
PCM, Engine Coolant Level Indicator Module, Windshield Washer Solvent
Level Switch
for a wiring diagram.
Circuit Description
The battery voltage is supplied to the indicator lamp in the cluster. The ground path from the lamp is through the oil pressure switch. When the oil pressure is low, the switch closes, illuminating the lamp.
Diagnostic Aids
Inspect for the following conditions:
| • | Poor connections--Inspect the instrument panel cluster (IPC) and harness connectors for the following conditions: |
| - | Backed-out terminals |
| - | Improper mating |
| - | Broken locks |
| - | Improperly-formed terminals |
| - | Damaged terminals |
| - | Poor terminal-to-wire connections |
| • | A damaged harness--Inspect the wiring harness for damage. If the harness appears OK, disconnect the engine oil pressure switch, turn ON the ignition, and observe a Digital Multimeter connected between the engine oil pressure switch connector terminal and ground while moving the wiring harnesses that are related to the engine oil pressure switch circuit. A change in voltage will indicate the location of the fault. |
Engine Oil Pressure Switch Diagnosis
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On Board Diagnostic (OBD) System Check? | -- | ||
2 | Inspect for correct oil level. Is the correct oil level indicated? | -- | Go to Oil Consumption Diagnosis or Oil Leak Diagnosis in Engine Mechanical | |
3 | With the ignition OFF, observe the oil pressure indicator. Is the indicator off? | -- | ||
4 | Turn ON the ignition, with the engine OFF. Is the engine oil pressure Indicator ON? | -- | ||
5 |
Important: Do not operate the engine longer than necessary in order to determine proper operation of the indicator. Start the engine.Does the indicator go out when the engine is running? | -- | System OK | |
6 |
Did you find and correct a problem? | -- | ||
7 | Inspect the cluster indicator lamps fuse. Is the fuse open? | -- | ||
8 |
Did you find and correct the problem? | -- | ||
9 |
Important: Do not operate the engine longer than necessary to determine proper engine oil pressure. Test the engine oil pressure with a mechanical pressure gauge. Refer to Oil Pressure Diagnosis and Testing in Engine Mechanical. Is proper engine oil pressure indicated? | -- | Go to Oil Pressure Diagnosis and Testing in Engine Mechanical | |
10 |
Is the indicator illuminated? | -- | ||
11 | Test the switch circuit for a short to ground between the switch and the Underhood Accessory Wiring Junction Block and repair as necessary. Refer to Wiring Repairs in Wiring Systems. Did you find and correct a problem? | -- | ||
12 |
Did you find and correct a problem? | -- | ||
13 |
Did the jumper fuse open? | -- | ||
14 |
Was a problem found and corrected. | -- | ||
15 | Is the indicator illuminated? | -- | ||
16 | Test for an open in the sensor circuit between the sensor and the underhood accessory wiring junction block, and repair the condition as necessary. Did you find and correct a problem? | -- | ||
17 |
Did you find and correct a problem? | -- | ||
18 | Test the ignition supply to the cluster for an open, and repair the condition as necessary. Did you find and correct a problem? | -- | ||
19 | Inspect the cluster and the cluster harness connector for faulty connections, and repair any conditions as necessary. Did you find and correct a problem? | -- | ||
20 |
Did you find and correct the condition? | -- | ||
21 | Replace the engine oil pressure switch. Did you complete the replacement? | -- | -- | |
22 | Replace the cluster. Refer to Instrument Cluster Replacement in instrument panel, gauges and console. Is the replacement complete? | -- | -- |
