Dodge Ram Truck 1500-2500-3500. Manual — part 1093

P0517-HIGH VOLTAGE AT THE BAT TEMP SENSOR (CONTINUED)

6.

ECM

Reconnect the ECM harness connectors.

While monitoring with the scan tool, use a jumper wire and connect
the sensor (K25) signal circuit to the sensor (K900) return circuit at the
sensor harness connector.

Did P0516 set?

Yes

>> Refer to the INTERMITTENT CONDITION Symptom

(Diagnostic Procedure). (Refer to 9 - ENGINE - DIAGNO-
SIS AND TESTING)

No

>> Replace the ECM.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)

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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P0521-OIL PRESSURE SWITCH RATIONALITY

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

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P0521-OIL PRESSURE SWITCH RATIONALITY (CONTINUED)

For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON-
TROL MODULE - SCHEMATIC - ELECTRICAL)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
While the key is on.

•

Set Condition:
Oil pressure is detected with engine RPM = 0 for 30 seconds.

Possible Causes

OIL PRESSURE SWITCH

(G6) SIGNAL CIRCUIT OPEN

INTERMITTENT CONDITION

ECM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)

Diagnostic Test

1.

OIL PRESSURE SWITCH

Turn the ignition off.

Disconnect the Oil pressure switch harness connector.

Check connectors - Clean/repair as necessary.

Measure the resistance between the oil pressure switch terminal and
ground.

Is the resistance less than 10 ohms?

Yes

>> Go To 2

No

>> Replace the oil pressure switch.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)

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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P0521-OIL PRESSURE SWITCH RATIONALITY (CONTINUED)

2.

(G6) SIGNAL CIRCUIT OPEN

Disconnect the ECM harness connectors.

Check connectors - Clean/repair as necessary.

Measure the resistance of the oil pressure switch (G6) signal circuit
between the oil pressure switch harness connector and the ECM har-
ness connector.

Is the resistance less than 10 ohms?

Yes

>> Go To 3

No

>> Repair the open Oil pressure (G6) signal circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)

3.

ECM

Reconnect the ECM harness connectors.

Turn the ignition on.

Measure the voltage between the oil pressure (G6) signal circuit at the
oil pressure switch harness connector and ground.

Is the voltage between 4.5 and 5.5 volts?

Yes

>> Refer to the INTERMITTENT CONDITION Symptom

(Diagnostic Procedure). (Refer to 9 - ENGINE - DIAGNO-
SIS AND TESTING)

No

>> Replace the ECM.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

9 - 1297