Tools - Revised Injector Tester
Bulletin Number: 93-6-31Reference Number: 316501R
Publish Date: 3/93
Subject:
SERVICE MANUAL UPDATE - SECTION 6E3, 6E2, DRIVEABILITY AND EMISSIONS, INTRODUCTION OF J 39021 FUEL INJECTOR TESTER
Models Affected:
1984-1993 ALL MODELS
In January 1993, Kent-Moore shipped to dealers a new Fuel Injector Tester (J 39021). This tool is being shipped as part of the Essential Tool Program. The Tester will detect intermittent coil failures that may be missed using an ohmmeter alone since the ohmmeter does not load the injector coil with enough current to detect intermittent coil failures.
The Fuel Injector Tester (J 39021) is capable of testing all major brands of fuel injectors; however, to use this tool with non-GM injectors you will need the appropriate injector connector adapter and the injector's resistance specifications. Refer to instructions included with tester for additional information on non-GM applications.
BACKGROUND
The use of injector cleaners and gasoline blends containing high levels of alcohol may cause fuel injectors to become faulty. Alcohol may attack the injector's solenoid coil wire and insulation resulting in a shorted or open solenoid coil. Damaged coils will result in driveability problems due to improper fuel delivery.
COIL TEST DESCRIPTION
The test procedure also requires the use of the J 39200 Digital Volt Meter (DVM). The J 39021 Fuel Injector Tester supplies one of three fixed current values throughout the duration of the test. Selection of a supply current value (0.5, 2.5, or 4.0 amp) is based on the injector's specified resistance. When the push-to-start-test button is depressed, the tool energizes the injector solenoid coil for five (5) seconds.
The condition of the injector solenoid coil (Pass/Fail) is determined by the voltage reading displayed on the DVM while the injector is energized.
Instructions and specifications are included with the tool.