B2434

TCS Throttle Actuator Motor, Break Or Mechanical Fault

Fault Symptom
- TCS OFF lamp lit, Traction Control System (TCS) system not functioning

Conditions
- Control module output pin 18, break.
- Control module output pin 35, break.
- Throttle mechanism or motor seizing.
- Linkage or return spring faulty.

Important:
- B2434 is generated when the throttle's "ACTUAL" value does not coincide with its "REFERENCE" value.
- This means that the throttle cannot assume a position calculated by the control module.
- This could be due to one of two reasons.
Mechanical fault, for example seized butterfly.
An electrical fault such as a break which prevents the throttle motor from working.
- If there is another diagnostic trouble code in the TCS system, remedy that first.

Action
- Check the leads to the throttle motor for breaks.
1 Ignition in the OFF position.
- Unplug the connector from the throttle body.
- Check the voltage supply in the female connector.
pin 1 to Batt+ approx. 12V
pin 5 to Batt+ approx. 12V
- If the values are correct, proceed to point 2.
- If the values are incorrect, proceed to point 3.





2 Remove the cover from the throttle body linkage.
- With the ignition turned off, check that the butterfly can easily be closed against the stop screw without seizing.
- The butterfly should also easily return to the fully open position under spring force.
If the function is OK, change the throttle body.
If the function is not correct, remedy the fault if possible or change the throttle body.
3 Conduct continuity tests on the two leads from control module outputs 18 and 35 for breaks.
- If the values are correct, proceed to point 4.
4 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.