C1203
DTC C1203
Circuit Description
The electronic brake control module (EBCM) monitors the powertrain control module (PCM). The EBCM will prevent traction control and vehicle stability control (VSC) operation if it determines fault within the powertrain control system.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C1203 Throttle Control System
Conditions for Running the DTC
DTC C1203 can be set anytime the ignition is in the ON position.
Conditions for Setting the DTC
The EBCM detects a fault within the PCM data circuits to the EBCM.
Action Taken When the DTC Sets
* The traction control and VSC is disabled.
* The VSC warning indicator turns ON.
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
Diagnostic Aids
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
The following are possible causes of the malfunction:
* An open or short circuit in the TRC - high or TRC - low circuits to the EBCM
* An open or short circuit in the ENG - high or ENG - low circuits to the EBCM
* An internal EBCM malfunction
If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step tests the PCM TRC - high and TRC - low circuits to the EBCM for an open, high resistance, or short.
3. This step tests the PCM ENG - high and ENG - low circuits to the EBCM for an open, high resistance, or short.
4. Test the PCM ground circuits for an open or high resistance.
