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Home › Dodge and Ram › 2009 › Durango Base, 3.7 K › Repair and Diagnosis › Engine Performance › System › DTCS P050D To P0585 › P0585-Speed Control Switch 1/2 Correlation › Diagnostic Test

Diagnostic Test

  1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) 
    1. Ignition on, engine not running.
      NOTE: This DTC is a two trip fault. If the scan tool indicates a one trip failure, the possible cause may have been the customer pressing both switches simultaneously. Test drive the vehicle and activate the Speed Control system. If the DTC matures to an active fault a repair is necessary.
    2. With a scan tool, select View DTCs.
    3. Ask the customer if it is possible that two buttons were pressed at the same time before this DTC set. If this is the case, no repair is necessary.
    4. Start the engine.
    5. Allow the engine to reach normal operating temperature.
    6. With the scan tool, select View DTCs.
      NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data.

      Is the DTC Active or Pending at this time?

      Yes 

      • Go to step  2

      No 

  2. SPEED CONTROL ON/OFF SWITCH 
    1. With the scan tool, monitor the Speed Control Switch voltage.
    2. Disconnect the Speed Control On/Off Switch harness connector.

      Did the voltage change to greater than 4.8 Volts?

      Yes 

      No 

      • Go to step  3
  3. SPEED CONTROL RESUME/ACCEL SWITCH 
    1. With the scan tool, monitor the Speed Control Switch voltage.
    2. Disconnect the Speed Control Resume/Accel Switch harness connector.

      Did the voltage change to greater than 4.8 Volts?

      Yes 

      No 

      • Go to step  4
  4. SPEED CONTROL SWITCHES 
    1. Turn the ignition off.
    2. Remove and disconnect the Speed Control Switches from the steering wheel in accordance with Service Information.
    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 specifications 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
  5. S/C SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 1: Measuring Voltage On S/C Switch Signal Circuit In Speed Control Harness Connector
    GC0090879Courtesy of CHRYSLER LLC
    Fig 2: Checking S/C Switch Signal Circuit Shorted To Voltage
    GC0090886Courtesy of CHRYSLER LLC
    1. Disconnect the C3 PCM harness connector.
    2. Measure the voltage on the (V37) and (V38) S/C Switch signal circuits at both Speed Control harness connectors.

      Is there any voltage present?

      Yes 

      No 

      • Go to step  6
  6. CLOCKSPRING 
    Fig 3: Measuring Resistance Of S/C Switch Signal Circuit Between Upper And Lower Clockspring Harness Connectors
    GC0090880Courtesy of CHRYSLER LLC
    Fig 4: Measuring Resistance Of S/C Switch Signal Circuits Between Clockspring Harness Connectors
    GC0090887Courtesy of CHRYSLER LLC
    Fig 5: Measuring Resistance Of S/C Switch Return Circuit Between Upper And Lower Clockspring Harness Connectors
    GC0090881Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the C1 and C3 Clockspring harness connectors in accordance with Service Information.
    3. Measure the resistance of the (V37) and (V38) S/C Switch signal circuits 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 Service Information before continuing.
      • Go to step  7
  7. S/C SWITCH SIGNAL CIRCUIT OPEN 
    Fig 6: Measuring Resistance Of S/C Switch Signal Circuit From Speed Control Harness Connector To Appropriate Terminal Of Special Tool #8815
    GC0090882Courtesy of CHRYSLER LLC
    Fig 7: Checking S/C Switch Signal Circuit Open
    GC0090888Courtesy of CHRYSLER LLC
    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.
    1. Measure the resistance of the (V37) and (V38) S/C Switch signal circuits from both Speed Control harness connectors to the appropriate terminals of special tool #8815.

      Is the resistance less than 5.0 ohms for each measurement?

      Yes 

      • Go to step  8

      No 

  8. (V937) S/C SWITCH RETURN CIRCUIT OPEN 
    Fig 8: 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: Take the measurement from both Speed Control Switch harness connectors.
    1. Measure the resistance of the (V937) S/C Switch Return circuit from both 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  9

      No 

  9. S/C SWITCH SIGNAL CIRCUITS SHORTED TO THE (V937) S/C SWITCH RETURN CIRCUIT 
    Fig 9: Measuring Resistance Between S/C Switch Signal Circuit And S/C Switch Return Circuit In Speed Control Harness Connector
    GC0090885Courtesy of CHRYSLER LLC
    Fig 10: Checking S/C Switch Signal Circuits Shorted To S/C Switch Return Circuit
    GC0090889Courtesy of CHRYSLER LLC
    1. Measure the resistance between the (V937) S/C Switch Return circuit and both of the (V37) and (V38) S/C Switch signal circuits in the Speed Control harness connector.

      Is the resistance less than 5.0 ohms?

      Yes 

      No 

      • Go to step  10
  10. (V37) S/C SWITCH NO. 1 SIGNAL CIRCUIT SHORTED TO THE (V38) S/C SWITCH NO. 2 SIGNAL CIRCUIT 
    Fig 11: Measuring Resistance Between S/C Switch Signal Circuit And S/C Switch Signal Circuit At Both Speed Control Harness Connectors
    GC0090890Courtesy of CHRYSLER LLC
    1. Measure the resistance between the (V37) S/C Switch No. 1 signal circuit and the (V38) S/C Switch No. 2 signal circuit at both Speed Control harness connectors.

      Is the resistance less than 100 ohms for each circuit?

      Yes 

      No 

      • Go to step  11
  11. S/C SWITCH SIGNAL CIRCUITS SHORTED TO GROUND 
    Fig 12: Measuring Resistance Between Ground And S/C Switch Signal Circuit In Speed Control Harness Connector
    GC0090884Courtesy of CHRYSLER LLC
    Fig 13: Checking S/C Switch Signal Circuits Shorted To Ground
    GC0090891Courtesy of CHRYSLER LLC
    1. Measure the resistance between ground and the (V37) and (V38) S/C Switch signal circuits at both Switch harness connectors.

      Is the resistance less than 100 ohms?

      Yes 

      No 

      • Go to step  12
  12. 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 a 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 a 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
  13. 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 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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