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Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1)  CHECK FOR DTC 32-EVAPORATOR SENSOR SHORTED WITH EVAPORATOR TEMPERATURE SENSOR HARNESS CONNECTOR DISCONNECTED 
    Fig 1: Identifying Evaporator Temperature Sensor Harness Connector
    GC0028170Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Evaporator Temperature Sensor harness connector.

    Turn the ignition on.

    Actuate the Clear DTC function by performing the following:

    • Turn the blower control on.
    • Press the A/C mode switch down, turn the blower control to off, wait 5 seconds and then release the A/C mode switch.
    • When the A/C status indicator begins displaying DTCs, set the Mode switch to the floor position, simultaneously press the A/C mode switch and the EBL mode switch down for 5 seconds and then release the mode switches. Stored DTCs will clear from memory in approximately two seconds.

    Turn the ignition off, wait 10 seconds, and turn the ignition on.

    Actuate the Display DTC function by performing the following:

    • Turn the blower control on.
    • Press the A/C mode switch down, turn the blower control to off, wait 5 seconds and then release the A/C mode switch.
    NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated.

    Read DTCs from the A/C status indictor.

    Does the A/C status indicator display DTC 32? 

    Yes 

    1. Go To step  2).

    No 

    1. Replace the Evaporator Temperature Sensor in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  2. 2)  CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    Fig 2: Checking Evaporator Temperature Sensor Signal Circuit For Short To Ground
    GC0028171Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the A/C Heater Control C2 harness connector.

    Measure the resistance of the (C21) Evaporator Temperature Sensor Signal circuit between ground and the A/C Heater Control C2 harness connector.

    Is the resistance below 10k ohms? 

    Yes 

    1. Repair the (C21) Evaporator Temperature Sensor Signal circuit for a short to ground.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To step  3).
  3. 3)  CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO (C121) SENSOR GROUND CIRCUIT 
    Fig 3: Checking Evaporator Temperature Sensor Signal Circuit, Sensor Ground Circuit, & Evaporator Temperature Sensor
    GC0028167Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between the (C21) Evaporator Temperature Sensor Signal circuit and the (C121) Sensor Ground circuit in the A/C Heater Control C2 harness connector.

    Is the resistance below 10k ohms? 

    Yes 

    1. Repair the (C21) Evaporator Temperature Sensor Signal circuit for a short to the (C121) Sensor Ground circuit.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Replace the A/C Heater Control in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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