Volvo Workshop Manuals
940 L4-2.3L SOHC VIN 88 B230F (1992)
Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Switch > Component Information > Technical Service Bulletins > Throttle Switch/Mechanism - Adjustment > Page 2355
Technical Service Bulletin # 25202
Throttle Switch/Mechanism - Adjust, Clean, Center
Date: May 1991
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
The following conditions must be satisfied to ensure that the problems are not attributable to sources other than the throttle housing, switch or
- 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.
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
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