For 1990-2009 cars
ABS Components
Antilock Brake System Schematics
Data Link Connector Schematics
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice

### Circuit Description

The PCM monitors various parameters and will not allow traction control operation if any parameter falls below a specified value.

### Conditions for Running the DTC

The ignition is ON.

### Conditions for Setting the DTC

The PCM detects a malfunction and then causes TCS shut down until the malfunction has been corrected.

### Action Taken When the DTC Sets

• | A DTC C1278 is stored (This is a temporary malfunction)

• | The TCS is disabled

• | The TRACTION OFF indicator is turned on

• | ABS remains functional.

### Conditions for Clearing the DTC

• | The condition for the DTC is no longer present and the scan tool clear DTC function is used

• | 100 ignition cycles have passed with no DTCs detected

### Diagnostic Aids

This code is for information only. As an aid to the technician, this code indicates that there are no problems in the ABS/TCS system. Any further references for diagnostic information should be taken from Engine Controls.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Powertrain On Board Diagnostic (OBD) System Check | Go to Diagnostic System Check - ABS