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Home >> Jeep >> 2003 >> Grand Cherokee Overland >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1595: Speed Control Solenoid Circuits, P1683: Speed Control Power Circuit >> Testing

DTC P1595: Speed Control Solenoid Circuits, P1683: Speed Control Power Circuit: Testing

    NOTE: You will need to actuate both S/C solenoids separately. Note the operation of each solenoid when actuated.
  1. With the ignition on and the engine not running, read the DTCs with the DRBIII®. With the DRBIII®, actuate the Speed Control Vacuum Solenoid and note operation. With the DRBIII®, actuate the Speed Control Vent Solenoid and note operation. If only the Vacuum Solenoid is not operating, go to the next step. If only the Vent Solenoid is not operating, go to step  5. If both S/C Solenoids are not operating, go to step  8. If both S/C Solenoids are operating, go to step  13.
  2. Turn the ignition off. Disconnect the Speed Control Servo harness connector. Turn ignition on, engine not running. With the DRBIII®, actuate the Speed Control Vacuum Solenoid. Using a 12-Volt test light connected to 12-Volts, probe the (V36) S/C Vacuum Solenoid Control circuit at the S/C Servo harness connector. Does the test light illuminate brightly and flash? If yes, replace the Speed Control Servo. If no, go to the next step.
  3. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the (V36) S/C Vacuum Solenoid Control circuit between the PCM harness connector and Speed Control Servo harness connector. Is the resistance below 5.0 ohms? If yes, go to the next step. If no, repair the open in the (V36) S/C Vacuum Solenoid Control circuit.
  4. Measure the resistance between ground and the (V36) S/C Vacuum Solenoid Control circuit at the PCM harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the (V36) S/C Vacuum Solenoid Control Circuit. If no, go to step  12.
  5. Turn the ignition off. Disconnect the Speed Control Servo harness connector. Ignition on, engine not running. With the DRBIII®, actuate the S/C Vent Solenoid. Using a 12-Volt test light connected to 12-Volts, probe the (V35) S/C Vent Solenoid Control circuit in the Speed Control Servo harness connector. Does the test light illuminate brightly and flash? If yes, replace the Speed Control Servo. If no, go to the next step.
  6. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the (V35) S/C Vent Solenoid Control circuit between the PCM harness connector and S/C Servo harness connector. Is the resistance below 5.0 ohms? If yes, go to the next step. If no, repair the open in the (V35) S/C Vent Solenoid Control circuit.
  7. Measure the resistance between ground and the (V35) S/C Vent Solenoid Control circuit at the PCM harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the (V35) S/C Vent Solenoid Control circuit. If no, go to step  12.
  8. Turn the ignition off. Disconnect the S/C Servo harness connector. Ignition on, engine not running. Turn the Cruise Control on. Using a 12-Volt test light connected to ground, probe the (V30) S/C Brake Switch Output circuit in the S/C Servo harness connector. Does the test light illuminate brightly? If yes, replace the Speed Control Servo. If no, go to next step.
  9. Turn the ignition off. Measure the resistance of the (V30) S/C Brake Switch Output circuit from the S/C Servo harness connector to the Brake Lamp Switch harness connector. Is the resistance below 5.0 ohms? If yes, go to the next step. If no, repair the open in the (V30) S/C Brake Switch Output circuit.
  10. Disconnect the Brake Lamp Switch harness connector. Ignition on, engine not running. Turn the Cruise Control on, it may be necessary to hold the On button down while checking the following circuit. Using a 12-Volt test light connected to ground, probe the (V32) S/C Power Supply circuit in the Brake Lamp Switch harness connector. Does the test light illuminate brightly? If yes, replace the Brake Lamp Switch. If no, go to the next step.
  11. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the (V32) S/C Power Supply circuit between the PCM harness connector and the Brake Lamp Switch harness connector. Is the resistance below 5.0 ohms? If yes, go to the next step. If no, repair the open in the (V32) S/C Supply circuit.
    12. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  12. Using the wiring diagram as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. If the there are no possible causes remaining, replace the Powertrain Control Module. Program the new PCM. See PROGRAMMING .
  13. Turn the ignition off. Disconnect the S/C Servo harness connector. Using a 12-Volt test light connected to 12-Volts, probe the (Z1) ground circuit in the S/C Servo harness connector. Does the test light illuminate brightly? If yes, refer to the INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, repair the open in the (Z212) ground circuit.
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