Diagnostic Instructions

DTC Descriptor

DTC C0392 01: Rotational Position Sensor Circuit Short to Battery

DTC C0392 02: Rotational Position Sensor Circuit Short to Ground

DTC C0392 08: Rotational Position Sensor Circuit Signal Invalid

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Invalid
Rotational Position Sensor Circuit	DTC C0392 02	--	DTC C0392 01	DTC C0392 08

Circuit/System Description

The transfer case shift control module has an input from the transfer case two/four wheel drive actuator position sensor otherwise know as a rotational position sensor (RPS). This sensor sends the transfer case control module a pulse width modulated signal which will vary constantly indicating the position of the transfer case actuator. This sensor also receives a 5-volt reference signal from the transfer case control module. This sensor works in conjunction with the incremental sensor which is inside the transfer case actuator. This sensor is more sensitive then the incremental position sensor and indicates the exact position of the transfer case actuator, showing the transfer case control module when the transfer case is between modes or ranges. It can also show how much clutch activation is being commanded at any time.

Conditions for Running the DTC

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Reference Information

Schematic Reference

Transfer Case Control Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information.

Diagnostic Aids

A RPS signal voltage that remains low 0.5 or lower indicates a short to ground on the RPS signal voltage circuit. It can also indicate an open or high resistance on the RPS low reference signal circuit.

Circuit/System Testing

The RPS 5-volt reference circuit, RPS low reference circuit, and RPS sensor signal circuits should be checked for shorts to ground, shorts to voltage, and opens or high resistance.

1. With the ignition on check the RPS 5-volt reference signal on the RPS connector pin 8 with the connector disconnected using a DMM.

⇒

The DMM should indicate 4.8-5.2 volts, if the voltage is low check for an open or high resistance or short to ground. If the voltage indicates the voltage is over the specification check for a short to voltage. If the circuit checks good replace the transfer case control module, program, and complete the motor learn procedure. If the circuit checks good with the RPS disconnected, connect the RPS and see if the DTC still show as current. If it does proceed to the next step.

2. With the transfer case shift control module connector X1 and X2 disconnected and the RPS disconnected check the RPS signal circuit and the RPS low reference circuits for shorts to ground, high resistance, or shorts to voltage.

⇒	If a shorting condition has been found then repair the circuits as necessary. If nothing is found in circuit testing then replace the RPS, and perform the motor learn procedure.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.