Tech Tip Corner
Tap Test of ECMs for GM Cars
General Motors bulletin # T-92-7
General Motors advised in their bulletin # T-92-7 that the testing of a
ECM should be done with the fingertips of one hand, against the top
of the ECM case. If you tap the bottom of the ECM case, you chance
causing enough deflection of the case bringing it into contact with the
electrical leads on the bottom of the circuit board.
Use your palm, fist, or any other tool(s) may subject the case and
circuit board of the ECM to stress beyond its' design limits. If the case
begins to flex, the internal circuit board will flex. This can cause the
Integrated Circuit chips (IS) to break away from the circuit board
creating a possible ECM failure or intermittent driveability problems.
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