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MP 3010-NP0 - Transfer Case




DTC C0392

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovides an overview of each diagnostic category.

DTC Descriptors
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/System Description

The transfer case shift control module (TCCM) receives input from the transfer case two/four wheel drive actuator position sensor, also known as the rotational position sensor (RPS). The RPS receives a 5-volt reference signal from the TCCM. In return the RPS sends the TCCM a variable pulse width modulated signal indicating the position of the transfer case actuator. The RPS works in conjunction with the incremental position sensor, inside the transfer case actuator, to confirm actuator position. The RPS is more sensitive than the incremental position sensor and is able to indicate to the TCCM the exact position of the transfer case actuator between modes or ranges changes. It is also able to show how much clutch activation is being commanded at any time.

Conditions for Running the DTC

* Ignition ON.
* System voltage 10.5-18 V.

Conditions for Setting the DTC

C0392 01

The TCCM sees an RPS-PWM voltage that does not constantly change, but remains high, >5.0 V, indicating a short to voltage.

C0392 02

The TCCM sees an RPS-PWM voltage that does not constantly change, but remains low, <0.5 V, indicating a short to ground.

C0392 08
* The module does not receive a 5-volt reference of 4.8-5.2 volts.
* The RPS low reference circuit has an open or high resistance causing a low voltage situation.

Action Taken When the DTC Sets
Current Mode:

4WD Auto or 4WD HI
* Clutch torque increased to maximum torque.
* No further mode/range changes allowed.
* The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle.

2WD HI
* No further mode/range changes allowed.
* The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle.

Mode/Range Shift
* Current mode/range change completed.
* No further mode/range changes allowed.
* The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle.

Conditions for Clearing the DTC

* The TCCM clears the DTC once the conditions for setting the DTC are no longer present.
* A history DTC clears after 40 consecutive warm up cycles without a fault present.
* History DTCs can be cleared using a scan tool.

Diagnostic Aids

* EL-49742 - harness is a good source for B+ and ground.
* The transfer case drain plug is a good source for ground.
* Typical RPS parameter values:

- 2WD HI = 30-40°
- 4WD Auto = 95-105°
- 4WD HI = 120-135°

Reference Information
Schematic Reference

Transfer Case Control Schematics MP 3010-NP0 - Transfer Case
Connector End View Reference

Component Connector End Views Connector End Views By Name
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearningfor scan tool information
Special Tools

* EL-49742 - Battery Voltage B+ and Ground Source Harness
* J 35616 - GM-Approved Terminal Test Kit

Circuit/System Verification

1. Key ON, engine OFF.
2. Connect a scan tool.
3. Using the TCSCS, select each transfer case mode/range while monitoring the Rotational Position Sensor parameter and the Incremental Position Sensor parameter on the scan tool, The Rotational Position Sensor parameter and the Incremental Position Sensor parameter should track within 5 degrees of each other.

Circuit/System Testing

Note: When test probing harness terminals, it is imperative to use the proper test probe from the most current version of the J 35616 - Kit. Use of an improper test probe may deform the terminal, resulting in intermittent open conditions.

1. Key OFF. Disconnect the X1 connector from the transfer case two/four wheel drive actuator position sensor also known as the rotational position sensor (RPS).
2. Key ON, engine OFF.
3. Using the GY probe J 35616-2A, test for 4.75-5.25 V between the 5-volt reference circuit, RPS X1 pin B and a good ground (the ground terminal of the EL-49742 - harness , black terminal).

• If the voltage is less than the specified range, test the affected circuit for an open/high resistance or short to ground. If all circuits and connections test normal, test the TCCM for proper operation.
• If the voltage is greater than the specified range, test the affected circuit for a short to voltage. If all circuits and connections test normal, test the TCCM for proper operation.

4. Using the GY probe J 35616-2A, test for 4.75-5.25 V between the 5-volt reference circuit, RPS X1 pin B and the low reference circuit, RPS X1 pin A.

• If the voltage is less than the specified range, test the low reference circuit for an open/high resistance. If all circuits and connections test normal, test the TCCM for proper operation.
• If the voltage is greater than the specified range, test the low reference circuit for a short to voltage. If all circuits and connections test normal, test the TCCM for proper operation.

5. Using the GY probe J 35616-2A, test for 4.5-5.0 V between the rotary position sensor signal circuit, RPS X1 pin C and a good ground.

• If the voltage is less than the specified range, test the rotary position sensor signal circuit for an open/high resistance or short to ground. If all circuits and connections test normal, test the TCCM for proper operation.
• If the voltage is greater than the specified range, test the rotary position sensor. signal circuit for a short to voltage. If all circuits and connections test normal, test the TCCM for proper operation.

6. Using the GY probe J 35616-2A, test for greater than 500 ohm between the low reference circuit, RPS X1 pin A and all other pins of the RPS X1.

• If the resistance is less than the specified range, test the affected circuits for a shorted together condition. If all circuits and connections test normal, test the TCCM for proper operation.

7. Using the GY probe J 35616-2A, test for greater than 500 ohm between the 5-volt reference circuit, RPS X1 pin B and all other pins of the RPS X1.

• If the resistance is less than the specified range, test the affected circuits for a shorted together condition. If all circuits and connections test normal, test the TCCM for proper operation.

8. Key OFF. Disconnect TCCM connector X2.
9. Using the GY probe J 35616-2A, test for greater than 10 ohm between the low reference circuit, TCSCS X2 pin 9 and all other pins of the TCCM X2.

• If the resistance is less than the specified range, test the affected circuits for a shorted together condition. If all circuits and connections test normal, test the TCCM for proper operation.

10. Using the GY probe J 35616-2A, test for greater than 10 ohm between the rotational position sensor circuit, TCSCS X2 pin 11 and all other pins of the TCCM X2.

• If the resistance is less than the specified range, test the affected circuits for a shorted together condition. If all circuits and connections test normal, test the TCCM for proper operation.

11. Test the RPS for proper operation.

Transfer Case Two/Four Wheel Drive Actuator Position Sensor/Rotational Position Sensor (RPS)

1. Key OFF. Disconnect the X1 connector at the RPS.
2. Remove the RPS from the transfer case.
3. Connect the RPS.
4. While monitoring the Rotational Position Sensor parameter in the Data Display section of the scan tool, rotate the center locating tab of the RPS. The Rotational Position Sensor parameter reading should sweep between -146 and +204 degrees.

• If the RPS does not function as explained, replace the RPS.

Transfer Case Shift Control Module (TCCM)

1. Key OFF. Disconnect the X1 connector.
2. Key ON, engine OFF. Connect the EL-49742 - harness.
3. Test for 4.5-5.5 V between the TCCM 5-volt reference pin, TCCM X1 pin 4, and the ground terminal of the EL-49742 - harness , black terminal.

• If the outside the specified range, replace TCCM.

4. Key OFF.
5. Connect the TCCM X1 connector. Disconnect the TCCM X2 connector.
6. Key ON, engine OFF.
7. Test for B+ (+0.0/-1.0 V) between the TCCM low reference pin, TCCM X2 pin 9, and the B+ terminal of the EL-49742 - harness , red terminal.

• If the outside the specified range, replace TCCM.

8. Test for B+ (+0.0/-1.0 V) between the TCCM rotational position sensor pin, TCCM X2 pin 11, and the B+ terminal of the EL-49742 - harness , red terminal.

• If the outside the specified range, replace TCCM.

9. Go to Circuit/System Testing.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Control Module References Programming and Relearningfor TCSCM replacement, setup, and programming
* Transfer Case High/Low Clutch Reset Transfer Case High/Low Clutch Reset
* Transfer Case Two/Four Wheel Drive Actuator Position Sensor Replacement Transfer Case Two/Four Wheel Drive Actuator Position Sensor Replacement

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