For 1990-2009 cars

# CODES 24,42,44,43 UPDATE DIAGNOSTIC CHART REVISION

Attached are 20 revised and three (3) new CCC/EFL Diagnostic Charts. The affected charts are as follows:

CCC

*1983 Chart -'Idle Speed Solenoid - Throttle Kicker' 1983 Chart -'Code 12 (Except Hall Switch)' 1983 Chart -'Code 12 (Hall Switch)' 1983 Chart 4 1983 Chart -'Code 24' 1983 Chart -'Pulse Width Modulated (PWM) EGR Check' 1983 Chart -'EGR Valve Check' 1983 Chart -'EFE (Vacuum Servo) Check' 1982/1983 Chart -'Engine Cranks But Will Not Run (Remote Coil)' 1982/1983 Chart -'Engine Cranks But Will Not Run (Integral Coil)' 1982 Chart - 'Code 42' 1982 Chart -'EGR Valve Check - 3.0L V6' 1982 Chart -'TCC Electrical Diagnosis' 1982 Chart 2 1981 Chart - 'Code 34'

EFI

1983 Chart -'Field Service Mode Check' 1983 Chart 3 *1983 Chart 8 * 1983 Chart 9 (two pages) 1983 Chart 11 1983 Chart -'Code 24' 1983 Chart -'Code 42' 1982/1983 Chart -'Code 44'

*Indicates New Chart

The 1983 chart revisions should be inserted into your General Carline Information Manual until permanent page revisions are printed. The 1981 and 1982 chart revisions should be taped over the existing charts in your 1981 or 1982 Service Manuals.

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.