Pinpoint Test I: The Traction Control Indicator is Always On

Anti-Lock Control

Pinpoint Tests

Pinpoint Test I: The Traction Control Indicator is Always On

Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information. Diagrams By Number

Normal Operation

Fused ignition voltage is sent to the traction control switch along circuit CBP35 (YE/GY) (for both traction control system activation and for illumination of the indicator in the switch). When the traction control switch is pressed, this voltage is sent to the PCM along circuit CCA15 (YE/GY). If the traction control system is currently enabled when the PCM receives this voltage, it internally grounds circuit CCA10 (WH/BN), this also grounds circuit CBP35 (YE/GY) through the traction control switch and illuminates the yellow traction control indicator in the switch. If the traction control system is currently disabled when the PCM receives this voltage, the PCM opens the internal ground which extinguishes the yellow traction control indicator in the switch.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- PCM



PINPOINT TEST I: THE TRACTION CONTROL INDICATOR IS ALWAYS ON

NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

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I1 CHECK THE TRACTION CONTROL SYSTEM OPERATION


- Test drive the vehicle and verify the traction control system operation.
- Does the traction control system operate normally with the yellow traction control indicator illuminated when the system is disabled and extinguished when the system is enabled?

Yes
The system is operating correctly. The concern may have been caused by a loose or corroded connector. INSPECT the traction control switch and PCM electrical connectors and REPAIR as necessary. TEST the system for normal operation.

No
If the system does not operate normally, GO to Pinpoint Test H. Pinpoint Test H: The Traction Control System is Inoperative Or The Traction Control System Cannot Be Disabled/Enabled

If the system operates normally but the yellow traction control indicator in the switch does not operate normally, GO to I2.

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I2 ISOLATE THE PCM


- Ignition OFF.
- Disconnect: PCM C1232b (Diesel).
- Disconnect: PCM C175t (Gasoline).
- Ignition ON.
- Is the traction control indicator illuminated?

Yes
GO to I3.

No
GO to I4.

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I3 CHECK CIRCUIT CCA10 (WH/BN) FOR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: Traction Control Switch C280.
- Measure the resistance between traction control switch C280-4, circuit CCA10 (WH/BN), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to I4.

No
REPAIR circuit CCA10 (WH/BN). TEST the system for normal operation.

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I4 CHECK THE PCM CONNECTORS


- Ignition OFF.
- Check the PCM connector for:
- corrosion.
- pushed-out pins.
- spread terminal.
- Connect the PCM connector and make sure that it is seated correctly.
- Make sure the connector is seated correctly then operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new PCM. TEST the system for normal operation.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.

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