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Diagnostic Test - PTU And RDM Hall Effect Position Sensor Faults

TECH TIP: 

NOTE: The position sensor diagnostics contained in the service information below apply to both the Power Transfer Unit (PTU) and Rear Drive Module (RDM) internal sensors.

HALL SENSOR SUPPLY CIRCUIT FAULT DIAGNOSTICS (C2050-1C): 

This fault is designated for the common internal voltage source that provides the sensor supply circuit to each actuator. A short to ground, or short to battery in either of the PTU or RDM position sensor supply circuits can cause the fault to set. A faulty sensor can also pull the supply voltage down and cause the fault. An open in one of the supply circuits should set a position sensor circuit fault against that actuator, not the supply circuit fault.

  1. Verify that the battery voltage is at the proper specification. Low battery voltage can cause erroneous DTCs to set.
    1. If the battery voltage is too low, repair the battery voltage issue and retest.
    2. If the battery voltage is good, continue to step 2. 
  2. Inspect the Drivetrain Control Module (DTCM), PTU and RDM connectors for any damage.
    1. If damage is found, repair the connector and retest.
    2. If no damage is found, continue to step 3. 
  3. Cycle the ignition off. Disconnect the RDM actuator motor harness connector. Cycle the ignition on. Measure the voltage between the RDM Position Sensor Supply (pin 4) and RDM Position Sensor Return (pin 9) circuits at the disconnected harness connector. The voltage should be approximately 7.5 volts (+/- 0.6 volts).
    1. If the voltage is reading normal, replace the RDM in accordance with the service information. The RDM motor and clutch assembly are a matched set used to create the clutch classification and clutch energy specifications. For this reason, the RDM motor should not be replaced separately from the assembly. If the RDM motor is determined to be faulty in any way, the RDM assembly should be replaced.
    2. If the voltage remains out of range, continue to step 4. 
  4. Cycle the ignition off. Disconnect the PTU actuator motor harness connector. Cycle the ignition on. Measure the voltage between the PTU Position Sensor Supply (pin 4) and PTU Position Sensor Return (pin 9) circuits at the disconnected harness connector. The voltage should be approximately 7.5 volts (+/- 0.6 volts).
    1. If the voltage is reading normal, replace the PTU actuator motor in accordance with the service information.
    2. If the voltage remains out of range, continue to step 5. 
  5. Turn the ignition off. Disconnect the DTCM harness connector. Check for continuity between chassis ground and the sensor supply circuit at the DTCM harness connector. There should be no continuity to ground.
    1. If there is continuity to ground on either circuit, repair the circuit for a short to ground and retest.
    2. If neither circuit is showing continuity to ground, continue to step 6. 
  6. Check for continuity between each position sensor supply circuit and both position sensor return circuits at the DTCM harness connector. There should be no continuity between either position sensor supply circuit and the sensor return circuits.
    1. If there is continuity on either sensor supply circuit to a sensor return circuit, repair the short between the circuits.
    2. If neither circuit is showing continuity, replace the DTCM in accordance with the service information. With the scan tool, perform the DTCM Replacement procedure in Misc Functions.

MOTOR POSITION SENSOR CIRCUIT FAULT DIAGNOSTICS- PTU (C2070-09) or RDM (C2060-09): 

The position sensor diagnostics contained in this service information apply to both the PTU and RDM actuator motors. Each actuator motor has two internal position signals. Perform the following test procedure on the suspect actuator and wiring.

  1. Turn the ignition off. Check the actuator motor harness connector for proper connection at the actuator. Verify that the connector is completely plugged in and properly locked prior to disconnecting for testing. Disconnect the actuator motor harness connector and check for any pushed out, damaged, corroded or spread terminals.
    1. If any damage is found to the connector or terminals, repair the connector and retest.
    2. If the connector and terminals appear in good shape, continue to step 2. 
  2. Check the DTCM harness connector for proper connection at the module. Verify that the connector is completely plugged in and properly locked prior to disconnecting for testing. Disconnect the DTCM harness connector and check for any pushed out, damaged, corroded or spread terminals.
    1. If any damage is found to the connector or terminals, repair the connector and retest. If the connector is corroded verify that the A/C drain is not plugged causing excessive water accumulation in the A/C condenser housing. If the housing accumulates too much water it can leak on the DTCM harness and connector causing harness damage.
    2. If the connector and terminals appear in good shape, continue to step 3. 
  3. With both harness connectors unplugged, check both position sensor signal circuits for continuity to either chassis ground or the sensor ground circuit at the actuator motor or DTCM harness connector. There should be no continuity to chassis ground or the sensor ground circuit with the circuits isolated.
    1. If either position sensor signal circuit shows continuity to chassis ground or the sensor ground circuit, repair the circuit for a short to chassis ground or the sensor ground circuit.
    2. If neither circuit is shorted, continue to step 4. 
  4. Check for continuity between both position sensor signal circuits and all other circuits at the actuator motor harness connector. There should be no continuity between the sensor signal circuit and the other circuits.
    1. If either circuit shows continuity to another circuit, repair the short between the circuits.
    2. If there is no continuity to another circuit, continue to step 5. 
  5. Measure the resistance of the position sensor signal and the sensor ground circuits between the actuator motor harness connector and the DTCM harness connector. They should typically have less than 3.0 Ohms.
    1. If either circuit has high resistance repair the circuit and retest.
    2. If both circuits test good, continue to step 6. 
  6. The following measurements can be taken at the actuator motor (component side). The measurements can also be taken at the DTCM harness connector with the actuator motor harness connector plugged in. This will test the wiring and actuator motor at the same time. Refer to wiring information to make sure that the correct pins are tested at the DTCM harness connector. The pins listed in the step are for checking at the actuator motors.  Measure the resistance between the position sensor signal 1 circuit (pin 10) and the position sensor supply circuit (pin 4). Measure the resistance between position sensor signal 2 circuit (pin 6) and the position sensor supply circuit (pin 4). The resistance should be between 1.5k and 2.0k Ohms for both measurements.
    1. If either circuit is out of range, replace the actuator motor in accordance with the service information. NOTE:  The RDM motor and clutch assembly are a matched set used to create the clutch classification and clutch energy specifications. For this reason, the RDM motor should not be replaced separately from the assembly. If the RDM motor is determined to be faulty in any way, the RDM assembly should be replaced.
    2. If both circuits are in range, continue to step 7. 
  7. Measure the resistance between position sensor signal 1 circuit (pin 10) and the position sensor return circuit (pin 9). Measure the resistance between position sensor signal 2 circuit (pin 6) and the position sensor return circuit (pin 9). The resistance should be between 3.0k and 6.0k Ohms for both measurements.
    1. If either circuit is out of range, replace the actuator motor in accordance with the service information. NOTE:  The RDM motor and clutch assembly are a matched set used to create the clutch classification and clutch energy specifications. For this reason, the RDM motor should not be replaced separately from the assembly. If the RDM motor is determined to be faulty in any way, the RDM assembly should be replaced.
    2. If both circuits are in range, continue to step 8. 
  8. This step is checking for an internal short of either signal circuit to the actuator motor housing. Measure the resistance between each position sensor signal circuit and the actuator motor housing. There should be no continuity between either position sensor signal circuit and the actuator motor housing.
    1. If either position sensor signal circuit has continuity to the actuator motor housing, replace the actuator motor in accordance with the service information. NOTE:  The RDM motor and clutch assembly are a matched set used to create the clutch classification and clutch energy specifications. For this reason, the RDM motor should not be replaced separately from the assembly. If the RDM motor is determined to be faulty in any way, the RDM assembly should be replaced.
    2. If both circuits test ok, replace the DTCM in accordance with the service information. With the scan tool, perform the DTCM Replacement procedure in Misc Functions. Retest the system for faults.
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