HEI MODULE TESTING CORRECT GROUNDING PROCEDURE. Pontiac Phoenix 1981

For 1990-2009 cars

# HEI MODULE TESTING CORRECT GROUNDING PROCEDURE

Known good HEI modules and new HEI modules from service stock may not meet test requirements when using the HEI tester (J-24642), if the tester ground has a poor connection. When using the tester, connect or contact the alligator clip for the tester ground directly to the flat metal surface on the underside of the HEI module. The metal eyelets on the module do not always make a good contact with the metal ground plate on the underside of the module and, therefore, should not be used when testing the module.

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.