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Throttle Switch/Mechanism - Adjust, Clean, Center: Overview

Model:
200/700/900

Group
25

Number:
202/704

Title:
Throttle Switch/ Mechanism - Adjustment, Centering/ Cleaning
200/700/900

Market:
US and Canada

Date: May 1991

Reference:
TP 31347/1 (English); 01/89; Regina Fuel System B230F
TP 31354/2 (English); 09/90; LH-Jetronic 2.4 B230F/FT, B234F
TP 31361/1 (English); 12/88; LH-Jetronic 2.4 B230F

This bulleting supersedes SB 23-137; 11/90.

This service bulletin describes fault-tracing procedures, corrective action, and a number of standard measures to be used when evaluating customer reports of rough engine running. The procedures cover conditions related to incorrect adjustment of the throttle housing, switch or mechanism, or some other fault in these components.

The following conditions must be satisfied to ensure that the problems are not attributable to sources other than the throttle housing, switch or mechanism:

- Faults (if any) indicated by faults codes stored in the diagnostic system must be corrected and no new codes displayed.

- The engine can be started and the car can be driven, both with the engine cold and hot.

- The throttle cable is not too tight. The throttle pulley must be free to return fully to its stopped position.

- There must be no air leakage into the intake manifold.

- The ignition and fuel injection systems (and the EGR system if applicable) must be operating satisfactorily. Otherwise, faults in these systems can cause uneven idling.

- Connectors and wiring must be properly connected and free of faults.


Note:
The throttle housing and plate will become dirty after a period of operation. This is normal and does not call for cleaning. Cleaning of the throttle housing and plate should be carried out only if the plate requires centering.


Corrective Action Chart:




The corrective action procedures illustrated in the table are shown in order of priority. The engine should be tested to verify that the problem has been solved when a fault has been found and corrected. If the problem is still present, proceed to the next measure. If the fault still persists after all the measures listed have been carried out, continue fault tracing on the wiring and control units as described in the service literature.


REMEMBER TO ERASE THE DIAGNOSTIC SYSTEM MEMORY BEFORE RETURNING THE CAR TO THE CUSTOMER ON COMPLETION OF SERVICE.
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