Manual Update - Revised DTC P0137, P0173, P0420

File In Section: 6E - Engine Fuel & Emission

Bulletin No.: 81-65-37

Date: February, 1 99S

SERVICE MANUAL UPDATE

Subject:
Section 6E - Engine Controls - Revised DTC P0137, P0172 and DTC P0420

Models:
1996-97 Chevrolet and GMC C/K Models
with 4.3L, 5.0L/5.7L, 7.4L Engine (VINs W, M, R, J - RPOs 1-35, 1-30, 1-31, L29)

DTC P0137 - Change Step 2 NO answer to "Go to Step 4" in the following Service Manuals:

1996 C/K Truck Book 2, Pages 6E-117 and 6E-57O 1997 C/K Truck Book 2, Pages 6E-125 and 6E-621

DTC P0172 - Change Step 12 HO2S reference to "Bank 1 Sensor 1" in the following Service Manuals:

1996 C/K Truck Book 2, Pages 6E-1 60 and 6E-627 1997 C/K Truck Book 2, Pages 6E-169 and 6E-678

DTC P0420 - Change Step 6 NO answer to "Go to Step 7" in the following Service Manuals:

1996 C/K Truck Book 2, Pages 6E-220 and 6E-696 1997 C/K Truck Book 2, Pages 6E-229 and 6E-748