For 1990-2009 cars

# SER. ENGINE SOON LIGHT CODE 22 DIAGNOSTIC PROC. (REPLACE TPS)

#### Subject: SERVICE ENGINE SOON LIGHT (CODE 22) (PROCEDURE/DIAGNOSTICS REPLACE TPS)

#### Models: 1991-92 FIREBIRD MODELS

This bulletin is being revised to pertain only to 5.0L L03 TBI engines. This bulletin cancels and replaces bulletin 92-6-2A.

This bulletin pertains to 5.0L L03 TBI engines.

Condition: Some owners of the above vehicles may comment on a Service Engine Soon Light - Code 22 - Throttle Position Sensor low. Additional comment may be poor idle quality. This condition may be more prevalent after initial startup.

Cause: The above concerns may result from an intermittent electrical contact inside the Throttle Position Sensor (TPS).

Correction: If any of the subject conditions are found, complete the following procedure:

1. Perform the normal diagnostics per Section 6E of the Service Manual.

2. If no problems are found using the normal 6E diagnostics or the bulletin, replace the TPS with a new TPS kit, P/N 17112679 per the procedure in Section 6E of the Service Manual. The new TPS will have a yellow dot at the connector area for easier identification.

Part is currently available from GMSPO. Use applicable labor operations and times.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.