Fuel - Revised DTC 35/36 Injection Pulse Width Error
File In Section: 6E - Engine Fuel & EmissionBulletin No.: 61-65-27
Date: May, 1996
SERVICE MANUAL UPDATE
Subject:
Section 3 - Control Module Systems Revised DTC 35/36 Injection Pulse Width Error
Models:
1994-95 Chevrolet and GMC C/K, G, P3 Models
with 6.5L Engine (VINs F, S and RPOs L65, L56)
This bulletin is being issued to inform technicians of a revision of DTC chart, DTC 35/36 Injection Pulse Width Error, located on the following pages:
^ Pages 3-72 through 3-75 in both the C/K and G Van 1994/1995 Driveability Emissions and Electrical Diagnosis Service Manuals
^ Pages 3-70 through 3-73 of the P/3 Driveability Emissions and Electrical Diagnosis Service Manual
Technicians are instructed to use revised chart for future diagnosis.
DTC Chart Test Description
Number(s) refer to the circle number(s) on the Diagnostic Chart.
1. This step checks the fuel solenoid driver ignition feed circuit for proper voltage. If voltage is less than 11 volts, injection pulse width will increase. This step should be done during the conditions that the DTC sets (cold engine, hot engine).
2. This step checks to see if there is a signal at the PCM.
3. This step will determine if the PCM is receiving the correct signal or if there is a faulty injection pump. For the Fuel Inject Control (CKT 984) duty cycle there is a corresponding duty cycle operating range for the Fuel Inject Signal (CKT 985). If the Fuel Inject Signal (CKT 985) is not in the corresponding operating range there is a problem with the injection pump. If the Fuel Inject Signal (CKT 985) is in the operating range the PCM is not processing the Signal.