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Home >> Chrysler >> 2002 >> Prowler >> Repair and Diagnosis >> Engine Performance >> System >> Powertrain Diagnostic Procedures >> Diagnostic Information And Procedures >> Speed Control - Diagnostic Tests >> P1597-Speed Control Switch Always Low >> Diagnostic Procedure

Diagnostic Procedure

  1. Turn the ignition on.

    With the DRBIII®, read the Speed Control voltage.

    Is the Speed Control voltage below 1.0 volts?

    1. Yes: Go To 2
    2. No: Go To  7.
  2. Turn the ignition on.

    With the DRBIII®, monitor the Speed Control Switch voltage.

    Disconnect the Speed Control On/Off Switch harness connector.

    Did the volt change to above 4.7 volts?

    1. Yes: Replace the Speed Control On/Off Switch.

      Perform POWERTRAIN VERIFICATION TEST VER - 4 .

    2. No: Go To 3
  3. Turn the ignition on.

    With the DRBIII®, monitor the Speed Control Switch voltage.

    Disconnect the Speed Control Resume/Accel Switch harness connector.

    Did the volt change to above 4.7 volts?

    1. Yes: Replace the Speed Control Resume/Accel Switch.

      Perform POWERTRAIN VERIFICATION TEST VER - 4 .

    2. No: Go To 4
  4. Turn the ignition off.

    Disconnect the Speed Control On/Off Switch harness connector.

    Disconnect the Speed Control Resume/Accel Switch harness connector.

    Disconnect the PCM harness connector.

    Measure the resistance between the Speed Control Switch Signal circuit and the Sensor ground circuit in the PCM harness connector.

    Is the resistance below 5.0 ohms?

    1. Yes: Repair the Speed Control Switch Signal circuit shorted to Sensor ground circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 4 .

    2. No - Go To 5
  5. Turn the ignition off.

    Disconnect the Speed Control On/Off Switch harness connector.

    Disconnect the Speed Control Resume/Accel Switch harness connector.

    Disconnect the PCM harness connector.

    Measure the resistance of the Speed Control Switch Signal circuit in PCM harness connector to ground.

    Is the resistance below 5.0 ohms?

    1. Yes: Repair the Speed Control Switch Signal circuit shorted to ground.

      Perform POWERTRAIN VERIFICATION TEST VER - 4 .

    2. No: Go To 6
  6. If there are no possible causes remaining, replace and program the Powertrain Control Module in accordance with the Service Information.

    Perform POWERTRAIN VERIFICATION TEST VER - 4 .

    7. WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
    NOTE: The conditions that set the DTC are not present at this time. The following list may help in identifying the intermittent condition.
  7. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.

    Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set.

    Refer to any Technical Service Bulletins (TSB) that may apply.

    Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.

    Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.

    Were any of the above conditions present?

    1. Yes: Repair as necessary.

      Perform POWERTRAIN VERIFICATION TEST VER - 4 .

    2. No: Test Complete.
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