Service Information

Spark

DTC B2745

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B2745 02: Traction Control Switch Circuit Short to Ground

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Traction Control Switch Signal	B2745 02	1	1	--
Traction Control Switch Ground	--	1	--	--
1. Traction Control Switch Inoperative

The electronic brake control module (EBCM) monitors the traction control switch. When the traction control switch is pressed once, the EBCM will sense that the traction control is disabled. When the traction control switch is pressed once again, the EBCM will sense that the stability control is disabled. The EBCM will send the signal to the instrument cluster to turn the traction control off and stability control off indicator ON to notify the driver of the deactivation.

Conditions for Running the DTC

•	Ignition ON.

•	Ignition voltage is greater than 8.0 volts.

Conditions for Setting the DTC

The EBCM detects the traction control system (TCS)/VSES switch is activated for 20 seconds or more.

Action Taken When the DTC Sets

•	The EBCM stores DTC.

•	The ABS/TCS/vehicle stability enhancement system (VSES) may work as before.

Conditions for Clearing the DTC

•	The conditions for setting the DTC are no longer present.

•	The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, with a scan tool command the IPC display test ON and OFF. The StabiliTrak indicator should turn ON and OFF.

⇒	If the indicator does not turn ON and OFF, replace the IPC.

Observe the scan tool EBCM Traction Control Switch parameter while pressing and releasing the traction control switch. The reading should change between Active and Inactive.

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the traction control switch.
Test for less than 1 ohm between the ground circuit terminal 4 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

Ignition ON, verify the scan tool Traction Control Switch parameter is Inactive.

⇒	If not the specified value, test the signal circuit terminal 3 for a short to ground.

Install a 3A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 4. Verify the scan tool Traction Control Switch parameter is Active.

⇒	If not the specified value, test the signal circuit for a short to voltage or an open/high resistance.

If all circuits test normal, test or replace the traction control switch. If the DTC resets, replace the EBCM.

Component Testing

Ignition OFF, disconnect the harness connector at the traction control switch.
Test for infinite resistance between the signal terminal 3 and the ground terminal 4 with the switch in the open position.

⇒	If not the specified value, replace the traction control switch.

Test for less than 3 ohms between the signal terminal 3 and the ground terminal 4 with the switch in the closed position.

⇒	If greater than the specified range, replace the traction control switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Refer to Control Module References for EBCM replacement, setup, and programming.