Pinpoint Test G: The Stability/Traction Control System is Inoperative
Anti-Lock Control
Pinpoint Test G: The Stability/Traction Control System is Inoperative
Normal Operation
The AdvanceTrac(R) and Roll Stability Control (RSC(R)) systems are controlled by the ABS module. The ABS module continuously monitors and compares the rotational speed of each wheel and when it detects a wheel spinning excessively, modulates brake pressure to the appropriate brake caliper. The ABS module will also send a message to the PCM along the High Speed Controller Area Network (HS-CAN) bus to modulate engine torque by adjusting engine timing and decreasing fuel injector pulses.
The system can be disabled by pressing the stability/traction control switch located in the Front Controls Interface Module (FCIM). The switch is hardwired to the Instrument Panel Cluster (IPC). When the stability/traction control switch is pressed, circuit CCA15 (YE/GY) is momentarily connected to the ground circuit GD114 (BK/BU) through the FCIM (Front Controls Interface Module). The IPC (Instrument Panel Cluster) detects this ground and sends a signal to the PCM and the ABS module along the HS-CAN (High Speed Controller Area Network) bus to disable the stability/traction control system. The IPC (Instrument Panel Cluster) will also illuminate the sliding-car OFF icon.
Because the stability/traction control switch is grounded through the FCIM (Front Controls Interface Module), any concerns with the FCIM (Front Controls Interface Module) should be addressed before diagnosing the stability/traction control switch.
Certain DTCs being present in the ABS module or communication DTCs being present in the IPC (Instrument Panel Cluster) or PCM will disable the system. When the system is disabled due to DTCs being present, both the ABS warning indicator and the sliding-car icon will be illuminated.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- PCM
- ABS module
- IPC (Instrument Panel Cluster)
- Stability/traction control switch (part of the FCIM (Front Controls Interface Module))
PINPOINT TEST G : THE STABILITY/TRACTION CONTROL SYSTEM IS INOPERATIVE
NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
G1 VERIFY THAT THE SYSTEM CAN BE ENABLED/DISABLED BY THE STABILITY/TRACTION CONTROL SWITCH
- Test drive the vehicle, press the stability/traction control switch and verify that the system can be enabled/disabled by the switch.
Can the system be enabled/disabled by the switch?
Yes
EXPLAIN correct system operation to the customer.
No
GO to G2.
G2 CHECK FOR ABS MODULE, PCM AND IPC (Instrument Panel Cluster) DTCs
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test- All CMDTCs (Continuous Memory Diagnostic Trouble Codes).
Are any DTCs present in the PCM, IPC (Instrument Panel Cluster) or ABS module?
Yes
For PCM DTCs, REFER to Computers and Control Systems Information.
For IPC (Instrument Panel Cluster) DTCs, REFER to the DTC Chart in Instrument Panel, Gauges and Warning Indicators. Instrument Panel, Gauges and Warning Indicators
For ABS module DTCs, GO to the ABS Module DTC Chart. Antilock Brakes / Traction Control Systems
No
GO to G3.
G3 VERIFY THE ABS MODULE CONFIGURATION
- Configure the ABS module. Refer to Programmable Module Installation (PMI) in Information Bus. Programming and Relearning
- Test drive the vehicle and verify that the traction control system operates correctly.
Does the system operate correctly?
Yes
The concern was due to improper or incomplete ABS module configuration.
No
GO to G4.
G4 CHECK THE SIGNAL CIRCUIT FOR A SHORT TO GROUND
- Disconnect: FCIM (Front Controls Interface Module) C2403.
- Disconnect: IPC (Instrument Panel Cluster) C220.
- Measure the resistance between IPC (Instrument Panel Cluster) C220-18, circuit CCA15 (YE/GY), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to G5.
No
REPAIR circuit CCA15 (YE/GY). CLEAR the DTCs. REPEAT the self-test.
G5 CHECK FOR CORRECT FCIM (Front Controls Interface Module) OPERATION
- Disconnect: FCIM (Front Controls Interface Module) C2403.
- Check for:
- corrosion.
- pushed-out pins.
- spread terminals.
- Connect the FCIM (Front Controls Interface Module) connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new FCIM (Front Controls Interface Module). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.