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Diagnostic Test

  1. DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE 
    NOTE: Use the following table as a reference when diagnosing speed control switch voltage DTCs. Compare the voltage readings displayed on the scan tool with the values in the table.
    - Switch 1 voltage (V71)  Switch 2 voltage (V72) 
    On/Off - Min. 0.5882 3.5294
    On/Off - Max. 1.1373 3.9216
    Set - Min. 3.1569 1.1765
    Set - Max. 3.5686 1.5686
    Cancel - Min. 1.5882 2.8431
    Cancel - Max. 2.0000 3.2549
    Accel - Min. 3.8824 2.0392
    Accel - Max. 4.1765 2.4706
    1. Start the engine and allow it to idle for at least 60 seconds.
      WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.
      NOTE: It may be necessary to test drive the vehicle and operate the speed control in order for this DTC to set.
    2. With a scan tool, select View DTCs.

      Is the status Active for this DTC?

      Yes 

      • Go to step  2

      No 

  2. SPEED CONTROL SWITCH 
    1. Turn the ignition off.
      NOTE: The steering wheel airbag must be removed to access the speed control switch connector. Refer to the appropriate Service information prior to removing the steering wheel airbag.
    2. Disconnect the Speed Control Switch harness connector.
      NOTE: When checking circuits, be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
    3. Turn the ignition on.
    4. With a scan tool, read the (V72) S/C Signal 2 voltage.
      NOTE: The (V72) S/C Signal 2 voltage should be above 4.8 Volts with the Speed Control Switch disconnected.

      Is the (V72) S/C Signal 2 voltage above 4.8 Volts with the Speed Control Switch disconnected?

      Yes 

      No 

      • Go to step  3
  3. SPEED CONTROL SWITCH WIRING HARNESS 
    1. Turn the ignition off.
    2. Disconnect the Clockspring C8 harness connector.
      NOTE: When checking circuits, be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
    3. Turn the ignition on.
    4. With a scan tool, read the (V72) S/C Signal 2 voltage.
      NOTE: The (V72) S/C Signal 2 voltage should be above 4.8 Volts with the connector disconnected.

      Is the (V72) S/C Signal 2 voltage above 4.8 Volts with the connector disconnected?

      Yes 

      No 

      • Go to step  4
  4. CLOCKSPRING 
    1. Turn the ignition off.
    2. Disconnect the Clockspring C2 harness connector.
      NOTE: When checking circuits, be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
    3. Turn the ignition on.
    4. With a scan tool, read the (V72) S/C Signal 2 voltage.
      NOTE: The (V72) S/C Signal 2 voltage should be above 4.8 Volts with the connector disconnected.

      Is the (V72) S/C Signal 2 voltage above 4.8 Volts with the connector disconnected?

      Yes 

      No 

      • Go to step  5
  5. (V72) S/C SIGNAL 2 CIRCUIT SHORTED TO GROUND 
    Fig 1: Measuring Resistance Between Ground And (V72) S/C Switch Sense 2 Circuit In Clockspring C2 Harness Connector
    GC0094915Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Measure the resistance between ground and the (V72) S/C Signal 2 circuit in the Clockspring C2 harness connector.

      Is the resistance above 100 Ohms?

      Yes 

      • Go to step  6

      No 

  6. (V72) S/C SIGNAL 2 CIRCUIT SHORTED TO THE (V937) S/C SWITCH GROUND CIRCUIT 
    Fig 2: Measuring Resistance Between S/C Switch Sense Circuit And S/C Switch Return Circuit In Clockspring C2 Harness Connector
    GC0094916Courtesy of CHRYSLER LLC
    1. Measure the resistance between the (V72) S/C Signal 2 circuit and the (V937) S/C Switch Ground circuit in the Clockspring C2 harness connector.

      Is the resistance above 100 Ohms?

      Yes 

      • Go to step  7

      No 

  7. (V72) S/C SIGNAL 2 CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 3: Checking S/C Circuit
    GC0099976Courtesy of CHRYSLER LLC
    NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
    1. Measure the resistance of the (V72) S/C Signal 2 circuit between the Clockspring C2 harness connector and the Powertrain Control Module (PCM) harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go to step  8

      No 

  8. (V937) S/C SWITCH GROUND CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 4: Checking S/C Circuit
    GC0099973Courtesy of CHRYSLER LLC
    NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
    1. Measure the resistance of the (V937) S/C Switch Ground circuit between the Clockspring C2 harness connector and the Powertrain Control Module (PCM) harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go to step  9

      No 

  9. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Speed Control Switch and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched, or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals.
    4. Perform any Technical Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

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