Circuit Description
The TC indicator is controlled by the EBTCM. The EBTCM supplies the ground to the TC indicator circuit to turn the indicator on. When the TC indicator circuit is not grounded at the EBTCM, the TC indicator remains off. When the EBTCM sees the traction control switch voltage go low, it turns the TC indicator on and disables traction control. The EBTCM harness connector contains a shorting bar for the TC indicator circuit. When the EBTCM connector is disconnected from the EBTCM, the shorting bar shorts the TC indicator terminal to ground turning on the indicator.
Diagnostic Aids
If the EBTCM harness connector is not securely connected to the EBTCM, the shorting bar in the harness connector may turn on the TC indicator. Make sure the EBTCM harness connector is securely connected to the EBTCM.
| • | It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction. |
| • | Thoroughly inspect any circuitry that may be causing the complaint for the following conditions: |
| - | Backed out terminals |
| - | Improper mating |
| - | Broken locks |
| - | Improperly formed or damaged terminals |
| - | Poor terminal-to-wiring connections |
| - | Physical damage to the wiring harness |
| • | The following conditions may cause an intermittent malfunction: |
| - | A poor connection |
| - | Rubbed-through wire insulation |
| - | A broken wire inside the insulation |
| • | If an intermittent malfunction exists refer to Intermittents and Poor Connections Diagnosis in Wiring Systems for further diagnosis. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
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If there is a malfunction in the Engine Control Module or Transmission Control Module that is inhibiting Traction Control, the TC indicator will turn on, but will not have a DTC stored in the EBTCM. The engine or transmission DTCs must be repaired before further diagnosis of the TC indicator circuit.
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This step checks for an internal EBTCM malfunction. You must install the pinout box and cable adapter to the harness connector at this point to prevent the shorting bar in the harness connector from grounding the circuit and turning on the indicator.
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This step checks for a short to ground in CKT XB105.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: TC indicator is on and traction control was not turned off. There are no DTC(s) set. | ||||
1 | Was the Diagnostic System Check performed? | -- | ||
Are there any DTCs set in Engine or Transmission? | -- | Go to Powertrain On Board Diagnostic (OBD) System Check for Engine DTCs or On-Board Diagnostic System Check for Transmission DTCs | ||
3 |
Does the switch state change from Off to On as the TCS switch is pressed and released? | -- | ||
Does the TC Indicator turn off? | -- | |||
5 | Replace the EBTCM. Refer to Electronic Brake and Traction Control Module Replacement . Is the replacement complete? | -- | -- | |
Is the resistance within the range specified in the value(s) column? | OL (infinite) | |||
7 | Repair CKT XB105 for a short to ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
8 | Suspect the Instrument Cluster. Refer to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges and Console. Is the repair complete? | -- | -- | |
9 |
Is the resistance within the range specified in the value(s) column? | OL (Infinite) | ||
10 | Repair CKT XA105 for an Short to Ground, being sure to check the traction control switch for a short. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
