GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1992 🢒 GMC C Pickup - 2WD 🢒 Bulletins 🢒 ERROR IN TECH-1 SOFTWARE CART. (INSTRUCTIONS FOR USAGE)

ERROR IN TECH-1 SOFTWARE CART. (INSTRUCTIONS FOR USAGE)

SUBJECT: ERROR IN TECH 1 SOFTWARE CARTRIDGE RELEASE FOR SOME '92 MODELS (SERVICE INFORMATION - INSTRUCTIONS FOR USE)

MODELS: 1992 C/K, G, P WITH 5.7L OR 6.2L ENGINE AND 4L80E AUTOMATIC TRANSMISSION

The 1988-92 TECH 1 transmission cartridge has two software conditions that may not allow correct diagnosis of the affected Vehicle systems.

CONDITIONS:

----------- 1. 1992 trucks with 5.7LTBI (L05) engines and HYDRA-MATIC 4L80-E transmissions (GVW greater than or equal to 8600 lbs) will display incorrect transmission temperature.

2. 1992 trucks with 6.2L Diesel (LL4) engines and HYDRA-MATIC 4L80-E transmissions are not included in the cartridge under the 1992 model year select options.

CAUSE:

------- Mis-programmed 1992 TECH 1 cartridge.

SERVICE INFORMATION:

1. Select a 1992 7.4 L TBI (L19) system with GVW greater than or equal to 8600 lbs. This will correctly display all data parameters including transmission temperature for the 5.7 TBI (L05) trucks with HYDRA-MATIC 4L80-E transmissions.

2. Select a 1991 6.2 Diesel (LL4) on the model year select screen. This will properly function for diagnosis of the 1992 application.

PARTS INFORMATION:

1988-92 TECH 1 transmission cartridges will be shipped to dealers with a label and a TECH 1 operators manual insert page to alert the user to the above conditions.

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.