Dodge Ram Truck 1500-2500-3500. Manual — part 1084

P0462-LOW VOLTAGE DETECTED AT THE FUEL LEVEL SENSOR (CONTINUED)

4.

ECM

Reconnect the ECM harness connector.

While monitoring with the scan tool, connect a jumper wire between
the (N4) signal circuit in the sensor harness connector and battery
negative.

Did the DTC P0463 set?

Yes

>> Test Complete.

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)

9 - 1258

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P0463-HIGH VOLTAGE DETECTED AT THE FUEL LEVEL SENSOR

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

9 - 1259

P0463-HIGH VOLTAGE DETECTED AT THE FUEL LEVEL 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:
Ignition on and battery voltage above 10.4 volts.

•

Set Condition:
The signal voltage from the sensor goes above a calibrated value for a calibrated amount of time.

Possible Causes

FUEL LEVEL SENSOR

(N4) SIGNAL CIRCUIT SHORTED TO GROUND

INTERMITTENT CONDITION

ECM

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

Diagnostic Test

1.

FUEL LEVEL SENSOR

Disconnect the ECM harness connectors.

Disconnect the Fuel level sensor harness connector.

NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of the Fuel level sensor across the (N4) signal circuit and (K900) return circuit.

Is the resistance less than 10 ohms?

Yes

>> Go To 2

No

>> Replace the Fuel level 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

DR/DH

P0463-HIGH VOLTAGE DETECTED AT THE FUEL LEVEL SENSOR (CONTINUED)

2.

(N4) SIGNAL CIRCUIT SHORTED TO GROUND

Measure the resistance between the (N4) signal circuit in the sensor
harness connector and battery negative.

Is the resistance less than 10 Ohms?

Yes

>> Repair the (N4) signal circuit shorted to ground.

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

No

>> Go To 3

3.

ECM

Reconnect the ECM harness connector.

While monitoring with the scan tool, disconnect the Fuel level sensor harness connector.

Did the DTC P0462 set?

Yes

>> Test Complete.

No

>> Replace the ECM.

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

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

9 - 1261