Diagnostic Test

ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information.
  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 switches simultaneously. Test drive the vehicle and activate the Speed Control system. If the DTC matures to an active fault a repair is necessary.
3. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK FOR HIGH RESISTANCE IN THE SPEED CONTROL SWITCH CIRCUITS
1. Turn the ignition off.
2. Disconnect the Speed Control Switch harness connector.
3. Disconnect the PCM C1 harness connector.
  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 the GPEC Diagnostic Adaptor to perform the diagnosis.
4. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
5. Measure the resistance of the (V72) S/C Signal 2 circuit between the GPEC Adaptor and Speed Control Switch harness connector.
6. Measure the resistance of the (V937) Switch Ground circuit between the GPEC Adaptor and Speed Control Switch harness connector.
  Is the resistance below 5.0 Ohms for both measurements?
  
  Yes
  - Go To 3
  No
  - Go To 5
SPEED CONTROL SWITCH
1. Turn the ignition off.
2. Disconnect the Speed Control Switch harness connector in accordance with the service information.
3. Measure the resistance between the (V72) S/C Signal 2 terminal and the (V937) S/C Switch Ground terminal at the Speed Control Switch, not the harness connector.
4. Monitor the Ohmmeter while pressing each function button on each switch.
5. The following resistance specs are taken between terminals (V72) S/C Signal 2 terminal and the (V937) Switch Ground terminal of the switch when holding the switch button in the following position:
  - Not pressing any switch - 20.5k Ohms
  - On/Off - 0.47k Ohms
  - Set/Decel - 4.34k Ohms
  - Cancel - 1.24k Ohms
  - Resume/Accel - 8.80k Ohms
  Does the function on the Speed Control Switch have the correct resistance value +/- 0.2 Ohm?
  
  Yes
  - Go To 4
  No
  - Replace the Speed Control Switch in accordance with the Service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
POWERTRAIN CONTROL MODULE
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Speed Control Switch and the Powertrain Control Module.
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
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the service information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
STEERING WHEEL JUMPER HARNESS
1. Turn the ignition off.
2. Disconnect the Clockspring C4 harness connector.
3. Measure the resistance of the (V72) S/C Signal 2 circuit between the Clockspring C4 harness connector and Speed Control Switch harness connector.
4. Measure the resistance of the (V937) Switch Ground circuit between the Clockspring C4 harness connector and Speed Control Switch harness connector.
  Is the resistance below 5.0 Ohms for both measurements?
  
  Yes
  - Go To 6
  No
  - Replace the Steering Wheel Jumper harness in accordance with the service information.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CLOCKSPRING
1. Disconnect the Clockspring C1 harness connector in accordance with the Service Information.
2. Measure the resistance of the (V72) S/C Signal 2 circuit between the C1 Clockspring connector and the GPEC Adaptor.
3. Measure the resistance of the (V937) Switch Ground circuit between the C1 Clockspring connector and the GPEC Adaptor.
  Is the resistance below 5.0 Ohms for both measurements?
  
  Yes
  - Replace the Clockspring in accordance with the service information.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Repair the circuit that measured above 5.0 Ohms for an open or high resistance.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .