Dodge Ram Truck 1500-2500-3500. Manual — part 1092

P0517-HIGH VOLTAGE AT THE BAT TEMP SENSOR

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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

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P0517-HIGH VOLTAGE AT THE BAT TEMP SENSOR (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:
With ignition on and battery voltage greater than 10.4 volts.

•

Set Condition:
The circuit voltage to the ECM is above a calibrated threshold for a certain period of time.

Possible Causes

BATTERY TEMP SENSOR

(K25) SIGNAL CIRCUIT OPEN

(K900) RETURN CIRCUIT OPEN

(K25) SIGNAL CIRCUIT SHORTED

ECM

INTERMITTENT CONDITION

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

Diagnostic Test

1.

BATTERY TEMP SENSOR

Disconnect the Battery temp sensor harness connector.

Check connectors - Clean/repair as necessary.

Measure the resistance of the Battery temp sensor

Is the resistance between 300 and 90k ohms?

Yes

>> Go To 2

No

>> Replace the Battery temp sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

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

2.

OPEN CIRCUIT

Reconnect the disconnected Battery temp sensor harness connector.

Disconnect the ECM harness connectors.

Check connectors - Clean/repair as necessary.

Measure the resistance between the temperature sensor (K25) signal
and (K900) return circuits at the ECM harness connector.

Is the resistance between 300 and 90k ohms?

Yes

>> Go To 5

No

>> Go To 3

3.

(K25) SIGNAL CIRCUIT OPEN

Disconnect the Battery temp sensor harness connector.

Measure the resistance of the sensor (K25) signal circuit between the
sensor harness connector and the ECM harness connector.

Is the resistance less than 10 Ohms?

Yes

>> Go To 4

No

>> Repair the open (K25) signal circuit.

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

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

4.

(K900) RETURN CIRCUIT OPEN

Measure the resistance of the sensor (K900) return circuit between the
sensor harness connector and the ECM harness connector.

Is the resistance less than 10 Ohms?

Yes

>> Go To 5

No

>> Repair the open (K900) return circuit.

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

5.

(K25) SIGNAL CIRCUIT SHORTED

Check for a short circuit from (K25) signal circuit to all other circuits at
the ECM harness connector.

Is the resistance more than 100k ohms?

Yes

>> Go To 6

No

>> Repair the shorted (K25) signal circuit.

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

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