Pinpoint Test Q: The Stability/Traction Control Disabled Indicator Is Never/Always On
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test Q: The Stability/Traction Control Disabled Indicator Is Never/Always On
Normal Operation
The traction control switch is hardwired to the Instrument Panel Cluster (IPC). When the traction control switch is pressed, the IPC sends a message to the ABS module (with Roll Stability Control (RSC(R))) or the PCM (traction control only) over the High Speed Controller Area Network (HS-CAN) communication bus indicating that the traction control switch has been pressed. The ABS module or PCM either disables or enables the stability/traction control system and sends a message back to the IPC to turn on or off the stability/traction control disabled indicator based upon the system state.
If the traction control switch state message is missing for less than 5 seconds, the stability/traction control disabled indicator remains in the last indication mode (on or off) based upon the last known good message received. If the traction control switch state message is missing for more than 5 seconds, the IPC sets DTC U0121:00 (RSC(R)) or U0100:00 (traction control only) in continuous memory and defaults the stability/traction control disabled indicator off.
This pinpoint test is intended to diagnose the following:
- Stability/traction control cannot be disabled
- ABS module
- IPC
PINPOINT TEST Q: THE STABILITY/TRACTION CONTROL DISABLED INDICATOR IS NEVER/ALWAYS ON
-------------------------------------------------
Q1 CARRY OUT THE IPC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger .
- Enter the IPC active command mode and select the stability/traction control disabled indicator (STAB_TC_LMP) active command. Command the stability/traction control disabled indicator on and off while observing the stability/traction control disabled indicator.
- Does the stability/traction control disabled indicator illuminate when commanded on and turn off when commanded off?
Yes
GO to Q2.
No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.
-------------------------------------------------
Q2 CHECK THE TRACTION CONTROL INPUT TO THE IPC
- Enter the following diagnostic mode on the scan tool: IPC DataLogger .
- Select the IPC stability/traction control indicator PID (STAB_CTRL_SW).
- Monitor the traction control PID while pressing and releasing the traction control disable switch.
- Does the stability/traction control PID read RELEASED when the button is released and DEPRESSED when the button is pressed?
Yes
GO to Q3.
No
REFER to Vehicle Dynamic Systems Testing and Inspection to diagnose the traction control system cannot be disabled.
-------------------------------------------------
Q3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST
- Check for recorded DTCs from the IPC self-test.
- Are any DTCs recorded?
Yes
For DTC U0100:00, GO to Pinpoint Test AU Pinpoint Tests AU: DTC U0100:00. For DTC U0121:00, GO to Pinpoint Test AW Pinpoint Tests AW: DTC U0121:00. For all other DTCs, REFER to DTC Charts.
No
For RSC(R), GO to Q4. For traction control only, GO to Q5.
-------------------------------------------------
Q4 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE SELF-TEST
- Check for recorded DTCs from the ABS module self-test.
- Are any DTCs recorded?
Yes
REFER to Vehicle Dynamic Systems Testing and Inspection.
No
INSTALL a new ABS module. REFER to Vehicle Dynamic Systems Service and Repair. TEST the system for normal operation.
-------------------------------------------------
Q5 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST
- Check for recorded DTCs from the PCM Key ON Engine OFF (KOEO) self-test.
- Are any DTCs recorded?
Yes
REFER to Electronic Engine Controls P Codes for Electronic Engine Controls.
No
INSTALL a new PCM. REFER to Electronic Engine Controls Service and Repair. TEST the system for normal operation.
-------------------------------------------------