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Home >> Jeep >> 2021 >> Gladiator Mojave, Part Time T/Case Control, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 118 (Drivetrain Control Module (DTCM) - DTCS C008E-00 To C1440-64) >> DTC Troubleshooting >> C1440-11-Transfer Case Clutch Pressure Sensor - Circuit Short To Ground >> Diagnostic Test - RDM Pressure Sensor Faults

Diagnostic Test - RDM Pressure Sensor Faults

WARNING: This page is about a different car, the 2022 Chrysler Voyager and 2022 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.

THE DTCS DESCRIPTIONS WITH T-CASE MOTOR AND T-CASE CLUTCH PRESSOR SENSOR CALLED OUT ARE USED FOR THE REAR DRIVE MODULE HYDRAULIC PUMP AND PRESSURE SENSOR ON THIS SYSTEM. 

RDM PRESSURE SENSOR CIRCUIT VOLTAGE OUT OF RANGE DIAGNOSTIC (C1440-1C): 

  1. Disconnect the pressure sensor harness connector at the RDM. Turn the ignition on and measure the voltage on the 5-Volt reference circuit. The voltage should read between 4.93 and 5.07 volts.
    • If the voltage is correct, the 5-volt reference is good. The condition is intermittent. Perform the intermittent diagnostic check.
    • If the voltage is reading near battery voltage, repair the 5-volt reference circuit for a short to battery voltage. A short to battery will typically occur from a wire to wire short or due to the voltage arcing across circuits in a connector.
    • If the voltage is low, continue to step 2. 
  2. Turn the ignition off. Disconnect the DTCM harness connector to isolate the circuit. Check the 5-volt supply circuit for an open and short to ground.
    • If the circuit is not open or shorted, and no voltage was present, replace the DTCM in accordance with the service information.
    • If an open or short to ground was detected, repair the circuit and retest.

RDM PRESSURE SENSOR CIRCUIT LOW/HIGH FAULT DIAGNOSTICS (C1440-11, C1440-12,):  There are multiple test methods listed below. The first test is a complete system diagnostic of the wiring and pressure sensor. The remaining tests are broken up by the individual circuit low/high faults. There can be advantages to using each method. All of the methods do not need to be performed. Pick the best test method based on accessibility, ease of testing, availability of test equipment. It is a good practice to perform a complete check of the wiring in case of calibration issues. Failure to perform a complete check of the wiring may lead to unnecessary replacement of the component or ECU. In some cases it may be beneficial to use parts of each method to test for different failure modes.

PRESSURE SENSOR AND COMPLETE CIRCUIT DIAGNOSTICS USING A DVOM AND THE ELECTRICAL TEST LEAD KIT:  If the C1440-64 pressure sensor performance fault is present, perform the COMPLETE SYSTEM DIAGNOSTICS test procedure in the HYDRAULIC PUMP DIAGNOSTICS procedure.

  1. Disconnect the pressure sensor harness connector at the RDM. Turn the ignition on and measure the voltage on the 5-Volt reference circuit. The voltage should read between 4.93 and 5.07 volts.
    1. If the voltage is reading near battery voltage, repair the 5-volt reference circuit for a short to battery voltage. A short to battery will typically occur from a wire to wire short or due to the voltage arcing across circuits in a connector.
    2. If the voltage is low, continue to step 2. 
    3. If the voltage is correct, continue to step 3. 
  2. Turn the ignition off. Disconnect the DTCM harness connector to isolate the circuit. Check the 5-volt supply circuit for an open and short to ground.
    • If the circuit is not open or shorted, and no voltage was present, replace the DTCM in accordance with the service information.
    • If an open or short to ground was detected, repair the circuit and retest.
  3. Check the sensor ground circuit for an open/high resistance between the pressure sensor connector and the ECU connector. The circuit can be checked on of two ways. Either disconnect the ECU harness connector and measure the resistance of the sensor ground circuit. The resistance should be less than 3.0 Ohms. Or connect the special tool (#2064100080, Kit, Electrical Test Lead) to the 5-volt reference circuit and sensor ground circuit at the pressure sensor harness connector with the switch on the Electrical Test Lead Kit in the open position. With the ignition on, move the switch to the closed position. If the sensor ground is good the 5-volt reference circuit should get pulled low and set the C1440-1C fault.
    GC0184425Courtesy of CHRYSLER GROUP, LLC
    1. If the sensor ground circuit tested good, continue to step 4. 
    2. If the resistance is above 3.0 Ohms or the fault doesn't set as intended, test and repair the sensor ground circuit for an open or high resistance.
  4. Connect the Electrical Test Lead Kit tool between the 5-volt reference circuit and the sensor signal circuit with the switch in the open position. Move the switch on the Electrical Test Lead Kit between the open and closed positions while monitoring the scan tool. If monitoring for faults, the circuit low fault should set when switched to the open position and the circuit high fault should set when switched to the closed position. If the sensor voltage is available on the scan tool, monitor the voltage readings. The voltage should be 0.0 volts when switched to the open position and 5.0 volts when switched to the closed position. Move the switch to adjust and use the tool to vary the resistance while monitoring the ECU signal voltage on the scan tool. Pick the result from a, b, or c below that best matches the results. 
    1. If the faults set as described and the signal voltage is 0.0 volts (open) and 5.0 volts (closed)  - the ECU and sensor circuits are testing good. The sensor is most likely faulty or has a poor connection at the harness connector. Check the sensor harness connector for pushed out, spread, corroded or dirty terminals before condemning the sensor.
    2. If the signal voltage is stuck low or only the circuit low fault sets  - the most likely cause is the sensor signal circuit is open or shorted to chassis ground. Disconnect the ECU harness connector and check the sensor signal circuit for a short to ground, or to the sensor ground circuit. If there is continuity between the sensor signal circuit and either chassis ground or the sensor ground circuit, repair the short. If the signal circuit is not shorted, continue testing for an open below.
      • If the signal reading voltage was 0.0 volts on the scan tool when switched to closed it would indicate an open circuit. If voltage was present, but less than 5.0 volts it would indicate that there is likely resistance in the circuitry. Check the signal circuit resistance between the sensor harness connector and the ECU harness connector. Typically, it should be less than 3.0 Ohms. If the resistance is not below 3.0 Ohms, use the wiring information to check all related harness connectors in the system for pushed out, spread, corroded or dirty terminals before condemning an ECU. If no issues are found, the ECU is most likely faulty.
    3. If the signal voltage is stuck high or only the circuit high fault sets  - the most likely cause is a short to voltage in the sensor signal or the sensor signal is shorted to the 5-volt reference circuit.

TYPICAL PRESSURE SENSOR CIRCUIT LOW DIAGNOSTICS: 

  1. Disconnect the pressure sensor harness connector at the RDM. Turn the ignition on and measure the voltage on the 5-Volt reference circuit. The voltage should read between 4.93 and 5.07 volts.
    1. If the voltage is reading near battery voltage, repair the 5-volt reference circuit for a short to battery voltage. A short to battery will typically occur from a wire to wire short or due to the voltage arcing across circuits in a connector.
    2. If the voltage is low, continue to step 2. 
    3. If the voltage is correct, continue to step 3. 
  2. Turn the ignition off. Disconnect the DTCM harness connector to isolate the circuit. Check the 5-volt supply circuit for an open and short to ground.
    • If the circuit is not open or shorted, and no voltage was present, replace the DTCM in accordance with the service information.
    • If an open or short to ground was detected, repair the circuit and retest.
  3. Check the sensor ground circuit for an open/high resistance between the pressure sensor connector and the ECU connector. The circuit can be checked one of two ways. Either disconnect the ECU harness connector and measure the resistance of the sensor ground circuit. The resistance should be less than 3.0 Ohms. Or connect the special tool (#2064100080, Kit, Electrical Test Lead) to the 5-volt reference circuit and sensor ground circuit at the pressure sensor harness connector with the switch on the Electrical Test Lead Kit in the open position. With the ignition on, move the switch to the closed position. If the sensor ground is good the 5-volt reference circuit should get pulled low and set the C1440-1C fault.
    GC0184425Courtesy of CHRYSLER GROUP, LLC
    1. If the sensor ground circuit tested good, continue to step 4. 
    2. If the resistance is above 3.0 Ohms or the fault doesn't set as intended, test and repair the sensor ground circuit for an open or high resistance.
  4. Disconnect the ECU harness connector. Measure the resistance of the sensor signal circuit between the sensor harness connector and the ECU harness connector. The resistance should be less than 3.0 Ohms.
    1. If the sensor signal circuit tested good, continue to step 5. 
    2. If the resistance is above 3.0 Ohms test and repair the sensor signal circuit for an open or high resistance.
  5. Verify that the ECU is capable of detecting the correct fault. Connect all ECU harness connectors. Turn the ignition on and clear all DTCs. Connect a fused jumper, or the Electrical Test Kit tool between the sensor signal circuit and the 5-volt reference circuit at the pressure sensor harness connector. The Electrical Test Kit tool should be switched to closed to connect the circuits. The C1440-12 Transfer Case Clutch circuit high fault should set with the jumper in place.
    1. If the sensor circuit high fault sets with the jumper in place, replace the RDM pressure sensor in accordance with the service information. Verify the RDM fluid level is correct and perform the system bleeding procedure.
    2. If the sensor circuit high fault does not set with the jumper in place, use the wiring information to check all related harness connectors in the system for pushed out, spread, corroded or dirty terminals before condemning an ECU. If no issues are found, the ECU is most likely faulty.

TYPICAL PRESSURE SENSOR CIRCUIT HIGH DIAGNOSTICS: 

  1. Disconnect the pressure sensor harness connector at the RDM. Turn the ignition on and measure the voltage on the sensor signal circuit. There should be no voltage present with the harness connector unplugged.
    1. If the voltage is not present, continue to step 2. 
    2. If the voltage is present, test and repair the sensor signal for a short to the 5-volt reference circuit or battery voltage. A short to battery will typically occur from a wire to wire short or due to the voltage arcing across circuits in a connector.
  2. Verify that the ECU is capable of detecting the correct fault. Connect all ECU harness connectors. Turn the ignition on and clear all DTCs. Connect a fused jumper, or the Electrical Test Kit tool between the sensor signal circuit and the sensor ground circuit at the pressure sensor harness connector. The Electrical Test Kit tool should be switched to closed to connect the circuits. The C1440-11 Transfer Case Clutch circuit low fault should set with the jumper in place.
    1. If the sensor circuit low fault sets with the jumper in place, replace the RDM pressure sensor in accordance with the service information. Verify the RDM fluid level is correct and perform the system bleeding procedure.
    2. If the sensor circuit low fault does not set with the jumper in place, the ECU is most likely faulty.
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