Pinpoint Test P: The Traction Control Disabled Indicator Is Never/Always On

Instrumentation and Warning Chimes

Pinpoint Tests

Pinpoint Test P: The Traction Control Disabled Indicator Is Never/Always On

Normal Operation

The traction control switch is hardwired to the Instrument Cluster (IC). When the traction control switch is pressed, the IC sends a message to the ABS module over the High Speed Controller Area Network (HS-CAN) communication bus indicating that the traction control switch has been pressed. The ABS module either disables or enables the traction control and sends a message back to the IC to turn on or off the traction control disabled indicator based upon the system state.

If the traction control message is invalid for 5 seconds or less or if the IC does not receive the traction control message for 5 seconds or less, the IC defaults the traction control indicator to the last indication mode (on/off), based upon the last known good message.

If the traction control switch state message is missing for more than 5 seconds, the IC sets DTC U0121 in continuous memory and defaults the traction control disabled indicator off.

This pinpoint test is intended to diagnose the following:

- Traction control concern
- ABS module
- IC

PINPOINT TEST P: THE TRACTION CONTROL DISABLED INDICATOR IS NEVER/ALWAYS ON

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P1 CARRY OUT THE IC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC traction control disabled indicator (TRAC OFF) active command. Command the traction control disabled indicator on and off while observing the traction control disabled indicator.
- Does the traction control disabled indicator illuminate when commanded on and turn off when commanded off?

Yes
GO to P2.

No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

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P2 CHECK THE TRACTION CONTROL INPUT TO THE IC

- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC traction control indicator PID (TRAC_SW).
- Monitor the traction control PID while pressing and releasing the traction control disable switch.
- Does the traction control PID read RELEASED when the button is released and DEPRESSED when the button is pressed?

Yes
GO to P3.

No
REFER to Vehicle Dynamic Systems Testing and Inspection to diagnose the traction control system cannot be disabled.

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P3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST

- Check for recorded DTCs from the IC self-test.
- Are any DTCs recorded?

Yes
For DTC U0121, GO to Pinpoint Test AM. Pinpoint Test AM: DTC U0121

For all other DTCs, REFER to DTC Charts. Diagnostic Trouble Code Tests and Associated Procedures

No
GO to P4.

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P4 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.

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