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Home >> Dodge and Ram >> 2009 >> Durango Base, 3.7 K >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0591 To P0685 >> P0591-Speed Control Switch 2 Performance >> Diagnostic Test

Diagnostic Test

  1. ACTIVE DTC 
    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 DTC active at this time?

      Yes 

      • Go to step  2

      No 

  2. SPEED CONTROL SWITCHES 
    1. Turn the ignition off.
    2. Remove the Speed Control Switches from the steering wheel.
    3. Measure the resistance across each Speed Control Switch.
    4. Monitor the ohmmeter while pressing each function button on each switch.
    5. The following resistance specs are taken between terminals (V38) S/C Switch No. 2 signal and (V937) S/C Switch Return circuits of the Switch when holding the switch button in the following position.
      • Not pressing any switch - 20.5k Ohms
      • On/Off - 8.87k Ohms
      • Set - 0.825k Ohms
      • Coast - 0.47k Ohms
      • Cancel - 3.92k Ohms
      • Resume/Accel - 1.87k Ohms
    6. The following resistance specs are taken between terminals (V37) S/C Switch No. 1 Signal and (V937) S/C Switch Return circuits of the Switch when holding the switch button in the following positions:
    • Not pressing any switch - 20.5k Ohms
    • On/Off - 0.47k Ohms
    • Set - 5.49k Ohms
    • Coast - 2.94k Ohms
    • Cancel - 1.24k Ohms
    • Resume/Accel - 15.4k Ohms
  3. (V38) S/C SWITCH NO. 2 SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 1: Checking S/C Switch Signal Circuit Shorted To Voltage
    GC0090886Courtesy of CHRYSLER LLC
    1. Disconnect the C3 PCM harness connector.
    2. Ignition on, engine not running.
    3. Measure the voltage of the (V38) S/C Switch No. 2 signal circuit in the S/C Switch harness connector.

      Is there any voltage present?

      Yes 

      No 

      • Go to step  4
  4. CLOCKSPRING 
    Fig 2: Measuring Resistance Of S/C Switch Signal Circuit Between Clockspring Harness Connectors
    GC0090887Courtesy of CHRYSLER LLC
    Fig 3: Measuring Resistance Of S/C Switch Return Circuit Between Clockspring Harness Connectors
    GC0090881Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the C1 and C3 Clockspring harness connectors per Service Information.
    3. Measure the resistance of the (V38) S/C Switch No. 2 signal circuit between the C1 and C3 Clockspring harness connectors.
    4. Measure the resistance of the (V937) S/C Switch Return circuit between the C1 and C3 Clockspring harness connectors.

      Is the resistance greater than 5 Ohms?

      Yes 

      No 

        NOTE: Connect the Clockspring harness connectors in accordance with the Service Information before continuing.
      • Go to step  5
  5. (V38) S/C SWITCH NO. 2 SIGNAL CIRCUIT OPEN 
    Fig 4: Measuring Resistance Of S/C Switch Signal Circuit From Both Speed Control Harness Connectors To Appropriate Terminal Of Special Tool #8815
    GC0090888Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
      CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 to perform diagnosis.
    2. Measure the resistance of the (V38) S/C Switch No. 2 signal circuit from both Speed Control harness connectors to the appropriate terminal of special tool #8815.

      Is the resistance less than 5.0 Ohms for both measurements?

      Yes 

      • Go to step  6

      No 

  6. (V937) S/C SWITCH RETURN OPEN 
    Fig 5: Measuring Resistance Of S/C Switch Return Circuit From Speed Control Harness Connector To Appropriate Terminal Of Special Tool #8815
    GC0090883Courtesy of CHRYSLER LLC
    NOTE: The measurement must be taken from both Speed Control Switch harness connectors.
    1. Measure the resistance of the (V937) S/C Switch Return circuit from the Speed Control harness connector to the appropriate terminal of special tool #8815.

      Is the resistance less than 5.0 Ohms for both measurements?

      Yes 

      • Go to step  7

      No 

  7. (V38) S/C SWITCH NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 6: Measuring Resistance Between Ground And S/C Switch Signal Circuit In Speed Control Harness Connector
    GC0090891Courtesy of CHRYSLER LLC
    1. Measure the resistance between ground and the (V38) S/C Switch No. 2 signal circuit in the Speed Control harness connector.

      Is the resistance less than 100 Ohms?

      Yes 

      No 

      • Go to step  8
  8. (V38) S/C SWITCH NO. 2 SIGNAL CIRCUIT SHORTED TO THE (V937) S/C SWITCH RETURN CIRCUIT 
    Fig 7: Measuring Resistance Between S/C Switch Signal Circuit And S/C Switch Return Circuit In Speed Control Harness Connector
    GC0090889Courtesy of CHRYSLER LLC
    1. Measure the resistance between the (V38) S/C Switch No. 2 signal circuit and the (V937) S/C Switch Return circuit in the Speed Control harness connector.

      Is the resistance less than 5.0 Ohms?

      Yes 

      No 

      • Go to step  9
  9. SPEED CONTROL SWITCH VOLTAGE VALUES 
    CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 and PCM Pinout Box Adapter 8815-1 to perform diagnosis.
    1. Install Miller Special Tool #8815-1 on the C3 PCM harness connector.
    2. Connect the S/C Switch harness connectors.
    3. Connect the Clockspring harness connectors.
    4. Turn the ignition on.
    5. With the scan tool, monitor the S/C Switch voltage readings.
    6. Using a voltmeter check the voltage on the (V37) S/C Switch No. 1 signal circuit and the (V38) S/C Switch No. 2 signal circuit at the appropriate terminals of the special tool #8815.
    7. Monitor the voltmeter.
    8. With the scan tool, monitor the S/C Switch voltage readings.
    9. Compare the voltage readings on the voltmeter to what the scan tool displayed.
    SWITCH POSITION  SWITCH No. 1 VOLTAGE VALUE  SWITCH No. 2 VOLTAGE VALUE 
    NO SWITCHES PRESSED 4.31 to 4.78 Volts 4.31 to 4.78 Volts
    ON/OFF PRESSED 0.59 and 1.13 Volts 3.53 and 3.92 Volts
    RES/ACCEL PRESSED 3.88 to 4.17 Volts 2.04 to 2.47 Volts
    SET PRESSED 3.16 to 3.56 Volts 1.17 to 1.56 Volts
    COAST PRESSED 2.57 to 2.94 Volts 0.77 to 1.09 Volts
    CANCEL PRESSED 1.59 to 1.99 Volts 2.84 to 3.25 Volts
  10. 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. Verify there is good pin to terminal contact in the Switch and PCM connectors.
    4. Refer to any Technical Service Bulletins (TSBs) that may apply.

      Were there any problems found?

      Yes 

      No 

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