EXPERTEC TSB (90-6-12)

Publication date: 1989-11-22
Reference number: 90-6-12

EXPERTEC TSB

TECHNICAL SERVICE BULLETIN

Reference Number(s): 90-6-12, Date of Issue: 11/22/89

USE OF IAC DRIVER TOOL - INFORMATON

Model(s): 1987-90 6000 AND GRAND PRIX WITH 2.8L AND 3.1L (VIN T,W)

Bulletin No.: Pontiac 90-6-12

Date: 11/22/1989

SERVICE INFORMATION

This bulletin is to inform General Motors Dealer Technicians using the Idle Air Control (IAC) Driver Tool "Special Tool" Number (22M - Concept Technology) or (J 37027-A - Kent Moore) on all 2.8L/3.1L MPFI engines that the Diagnostic Test Terminal must be grounded or Field Service Mode entered if a "Scan Tool" is used.

The grounding procedure is fully explained in the diagnostic charts for Service Manual Sections "6E3-A" (Code 35) and "6E3-C2" (Idle Air Control (IAC) Circuit). However, the grounding procedure must also be followed when using the tool for other uses such as: Idle (RPM) Control, Generator Diagnosis, A/C Recharging, etc.

The engine carlines involved are as follows:

1989-1990 "6000 And Grand Prix" Carlines

1987-1988 "6000 And Grand Prix" Mass Air Flow to Speed Density

Updates It should also be noted that whenever the IAC system is disconnected or a battery disconnect is made, the "Idle Learn Procedure" in Section "6E3-C2" of the Service Manual should be followed.