B1303

Traction Control System(TCS) Throttle Butterfly Position Sensor, Break/Short-Circuit

Fault Symptom
- TCS OFF lamp lit, TCS system not functioning

Conditions
- For diagnostic trouble code B1302:
Control module output pin 3 broken or shorted to ground, or control module input pin 27 shorted to ground
- For diagnostic trouble code B1303:
Control module output pin 20 broken or shorted to battery+, or control module input pin 27 shorted to battery+.

Important B1302 and B1303 can be registered during fault diagnosis when connectors to the throttle body and unplugged and the ignition is placed in the drive position.

Action
- Check the cable assembly to the control module:
1 Unplug the 5 pin connector from the throttle body.
Ignition in ON position.
- Measure voltage supply in the female connector:
pin 2 to Battery: approx. 5V
Battery + to pin 4: approx 12V
- Connect the ISAT and select the command "TCS THROTTLE POS" in the "OBTAIN READOUTS" menu.
ISAT should show: approx 9%
- Bridge between pins 2 and 3 in the female connector.
ISAT should now show: approx 92%.
- If all measured values are correct, change the throttle body.
- If any of the values is incorrect, proceed to point 2.





2 Conduct continuity tests on the leads between pins 2, 3 and 4 in the female connector and associated control module connector for breaks, shorts and any bypasses.
- If the values are correct, proceed to point 3.

3 Erase the diagnostic trouble code, test-drive the car and see if the diagnostic trouble code is reregistered.
- If the trouble code is registered, proceed to Control Module, Procedure Prior To Replacement.
- If the diagnostic trouble code is not registered, the action taken was correct or the fault was of the intermittent type.