How to Solve Engine Oil Pressure Sensor Circuit Failed High for Detroit Gen 5 DD Engine

This instruction show you guide on how to solve engine oil pressure sensor circuit failed high for Detroit deisel Gen 5 DD engine.

 

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Description:This Fault Sets When Either Short to Voltage or Open circuit on Engine Oil Pressure (EOP) Sensor Circuit Are Present.

Monitored Parameter:Engine Oil Pressure

Typical Enabling Conditions:Always On

Monitor Sequence:Key ON Engine Running

Execution Frequency:Continuous When Enabling Conditions Are Met

Typical Duration:Two Seconds

Dash Lamps:CEL

Engine Reaction:None

Verification:Check at Engine Operating Temperature

Procedures:

Note : If diagnostic leads to a mechanical (non-electrical) low oil pressure condition, all mains and connecting rods should be inspected.

 

Check as follows:

1.Turn the ignition ON (key ON, engine OFF).

2.Check for multiple codes. Is SPN 3510/FMI 3 also present?

2a Yes; diagnose 3510/FMI 3 fault first.

2b No; Go to step 3.

3.Disconnect the Engine Oil Pressure (EOP) sensor and inspect the electrical connector for damage, corrosion or spread pins. Is damage, corrosion or spread pins present?

3a Yes; repair as necessary.

3b No; Go to step 4.

4.Measure the resistance between pin 2 of the EOP sensor harness connector and ground. Is the resistance greater than five ohms?

4a Yes; repair open between pin 2 of the EOP sensor and pin 105 of the MCM 120-pin connector.

4b No; Go to step 5.

5.Measure the voltage between pin 3 of the EOP sensor harness connector and ground. Is voltage present?

5a Yes; Go to step 6.

5b No; repair open between pin 3 of the EOP sensor and pin 82 of the MCM 120-pin connector.

6.Is the voltage from previous step greater than five volts?

6a Yes; repair short to battery power between pin 3 of the EOP sensor and pin 82 of the MCM 120-pin connector.

6b No; Go to step 7.

7.Measure the voltage between pin 2 of the EOP sensor harness connector and ground. Is voltage present?

7a Yes; repair the short to power between pin 2 of the EOP sensor and pin 105 of the MCM 120-pin connector.

7b No; Go to step 8.

8.Measure the voltage between pin 1 of the EOP sensor harness connector and ground. Is voltage present?

8a Yes; repair the short to power between pin 1 of the EOP sensor and pin 54 of the MCM 120-pin connector.

8b No; Go to step 9.

9.Measure the resistance between pin 1 of the EOP sensor harness connector and pin 54 of the MCM 120-pin connector. Is the resistance greater than five ohms?

9a Yes; repair an open between pin 1 of the EOP sensor harness connector and pin 54 of the MCM 120-pin connector.

9b No; replace the EOP sensor.

More ISUZU repair,please refer to:ISUZU Truck Repair.