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

Instrumentation and Warning Chimes

Pinpoint Test

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 Antilock Brakes / Traction Control Systems 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 Tests AM: DTC U0121

For all other DTCs, REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions

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 Antilock Brakes / Traction Control Systems.

No
INSTALL a new ABS module. REFER to Antilock Brakes / Traction Control Systems. TEST the system for normal operation.

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