Diagnostic Routine A

Diagnostic Routine A

Diagnostic Overview

The Cruise Control Is Inoperative

Normal Operation and Fault Conditions

REFER to Adaptive Cruise Control (ACC) Operation .

Pinpoint Test

1. CHECK FOR PCM (Powertrain Control Module) DTCs (Diagnostic Trouble Codes)

1. Ignition ON.

2. Using a scan tool, perform the PCM (Powertrain Control Module) KOEO (Key ON Engine OFF) self-test.

Are any DTCs (Diagnostic Trouble Codes) recorded?








2. CHECK FOR SCCM (Steering Column Control Module) DTCs (Diagnostic Trouble Codes)

1. Using a scan tool, perform the SCCM (Steering Column Control Module) self-test.

Are any DTCs (Diagnostic Trouble Codes) recorded?








3. CHECK THE C-CM (Cruise-Control Module) DTCs (Diagnostic Trouble Codes)

1. Using a scan tool, perform the C-CM (Cruise-Control Module) self-test.

Are any DTCs (Diagnostic Trouble Codes) recorded?








4. CHECK FOR LOST COMMUNICATION DTCs (Diagnostic Trouble Codes)

1. Using a scan tool, clear continuous DTCs (Diagnostic Trouble Codes) from all modules.

2. Ignition OFF.

3. Ignition ON.

4. Wait at least 10 seconds.

5. Retrieve all continuous DTCs (Diagnostic Trouble Codes) from all modules.

Are any lost communication DTCs (Diagnostic Trouble Codes) set in the C-CM (Cruise-Control Module) module?








5. CHECK FOR ABS (Anti-Lock Brake System) MODULE DTCs (Diagnostic Trouble Codes)

1. Using a scan tool, perform the ABS (Anti-Lock Brake System) module self-test.

Are any DTCs (Diagnostic Trouble Codes) recorded?








6. CHECK FOR BCM (Body Control Module) DTCs (Diagnostic Trouble Codes)

1. Using a scan tool, perform the BCM (Body Control Module) module self-test.

Are any DTCs (Diagnostic Trouble Codes) recorded?








7. CHECK THE STOPLAMP SWITCH (BOO1) AND CRUISE CONTROL DEACTIVATOR SWITCH (BOO2) PIDs (Parameter Identifications)

1. Using a scan tool, view Powertrain - Cruise Control PIDs (Parameter Identifications).

2. Monitor the powertrain PIDs (Parameter Identifications) BOO1 (stoplamp switch) and BOO2 (cruise control deactivator switch) while applying and releasing the brake pedal.





Do the PID (Parameter Identification) values agree with the brake pedal position?








8. CHECK THE CRUISE CONTROL SWITCH

1. Using a scan tool, view Powertrain - Cruise Control PIDs (Parameter Identifications).

2. Press each cruise control switch while monitoring the cruise control switch PID (Parameter Identification) (SCCS).





Does the PID (Parameter Identification) value agree with the switch position?








9. CHECK FOR CORRECT PCM (Powertrain Control Module) OPERATION

1. Disconnect all the PCM (Powertrain Control Module) connectors.

2. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

3. Reconnect all the PCM (Powertrain Control Module) connectors. Make sure they seat and latch correctly.

4. Operate the system and determine if the concern is still present.

Is the concern still present?