Engine Controls - Error In Tech 1 Software Cartridge

91chevy23

GMC NUMBER: 92-7A-21

GROUP: 7A Automatic Transmission


DATE: October, 1991


CORPORATE NUMBER: 177126


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 5.7L TBI (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 sliipped to dealers with a label and a TECH 1 operators manual insert page to alert the user to the above conditions.