Step
| Action
| Value(s)
| Yes
| No
|
1
| Did you perform
the Instrument Cluster Diagnostic System Check?
| --
| Go to
Step 2
| Go to
Diagnostic System Check - Instrument Cluster
|
2
| Verify that the engine oil pressure gauge is inaccurate
or inoperative.
Does the engine oil pressure gauge operate normally?
| --
| Go to
Testing for Intermittent Conditions and Poor Connections
in Wiring
Systems
| Go to
Step 3
|
3
| Is the oil pressure gauge above 80 psi?
| --
| Go to
Step 6
| Go to
Step 4
|
4
| Does the oil pressure gauge remain at 0 psi?
| --
| Go to
Step 8
| Go to
Step 5
|
5
|
- Ensure that the engine oil level is correct.
- Ensure that the engine develops adequate oil pressure. Refer to Oil Pressure Diagnosis and Testing
in Engine Mechanical - 4.3L.
- Disconnect the oil pressure switch connector. Refer to
Circuit Testing
.
- Connect a J 33431-C
between
the engine oil pressure switch connector cavity A and the a good ground.
- Turn ON the ignition, with the engine OFF. Do NOT start the engine.
- Vary the resistance on the J 33431-C
back
and forth from 1-100 ohms of resistance.
Does the oil pressure gauge operate normally?
| 0 ohms (no oil pressure)
88 ohms (maximum oil pressure)
| Go to
Step 12
| Go to
Step 13
|
6
|
- Ensure that the engine oil level is correct.
- Ensure that the engine develops normal oil pressure. Refer to Oil Pressure Diagnosis and Testing
in Engine Mechanical - 4.3L.
- Disconnect the oil pressure switch connector. Refer to
Circuit Testing
in Wiring Systems.
- Turn ON the ignition with the engine OFF. Do NOT start the engine.
- Using a digital multimeter (DMM), measure the voltage between
the oil pressure sensor signal circuit and a good ground. Refer to
Circuit Testing
in Wiring Systems.
Does the voltage measure within the specified range?
| 7-9.5 volts
| Go to
Step 12
| Go to
Step 7
|
7
|
- In order to prevent damage to the terminal, backprobe the cluster
connector using a DMM. Refer to
Instrument Cluster Replacement
.
- Measure the voltage between the oil pressure signal circuit and
a good ground. Refer to
Circuit Testing
in Wiring Systems.
Does the voltage measure within the specified range?
| 7-9.5 volts
| Go to
Step 11
| Go to
Step 13
|
8
|
- Ensure that the engine oil level is correct.
- Ensure that the engine develops adequate oil pressure. Refer to Oil Pressure Diagnosis and Testing
in Engine Mechanical - 4.3L.
- Turn ON the ignition with the engine OFF. Do NOT start the engine.
- Disconnect the oil pressure switch connector.
Does the oil pressure gauge remain past 80 psi?
| --
| Go to
Step 12
| Go to
Step 9
|
9
|
- Disconnect the instrument cluster connector. Refer to
Instrument Cluster Replacement
.
- Remove the connector comb.
- Using a test lamp, test between a good power source and the oil
pressure sensor signal circuit. Refer to
Circuit Testing
in Wiring Systems.
Does the test lamp illuminate?
| --
| Go to
Step 10
| Go to
Step 14
|
10
| Repair the short to ground in the oil pressure sensor signal circuit.
Refer to
Wiring Repairs
in
Wiring Systems.
Did you complete the repair?
| --
| Go to
Step 16
| --
|
11
| Repair the open in the oil pressure sensor signal circuit. Refer to
Wiring Repairs
in Wiring Systems.
Did you complete the repair?
| --
| Go to
Step 16
| --
|
12
| Replace the engine oil pressure switch. Refer to
Engine Oil Pressure Sensor and/or Switch Replacement
in
Engine Mechanical-4.3L.
Did you complete the replacement?
| --
| Go to
Step 16
| --
|
13
|
- Disconnect the instrument cluster connector. Refer to
Instrument Cluster Replacement
.
- Remove the connector comb.
- Using the DMM, measure the voltage between the engine oil pressure
sensor signal circuit and a good ground. Refer to
Circuit Testing
in Wiring Systems.
Did you find a short to battery voltage?
| --
| Go to
Step 15
| Go to
Step 14
|
14
| Replace the Instrument Cluster. Refer to
Instrument Cluster Replacement
.
Did you complete the replacement?
| --
| Go to
Step 16
| --
|
15
| Repair the short to battery voltage in the oil pressure sensor signal
circuit. Refer to
Wiring Repairs
in Wiring Systems.
Did you complete the repair?
| --
| Go to
Step 16
| --
|
16
| Operate the system in order to verify the repair.
Did you correct the condition?
| --
| System OK
| Go to
Step 3
|
