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TROUBLE DIAGNOSES - Diagnostic Procedure (Cont'd)

EF & EC-54prose procedure
Continued from EF & EC-53

Diagnostic Procedure (Cont'd)

  1. 7
    When measuring E.C.U. controlled components supply voltage with a circuit tester, separate one tester probe from the other. If the two tester probes accidentally make contact with each other during measurement, the circuit will be shorted, resulting in damage to the control unit power transistor.
    Cartoon illustration showing improper measurement: a technician using a circuit tester to measure battery voltage on a solenoid valve harness connector, with one tester probe shorting against the other. Labels: Battery voltage, Short, Harness connector for solenoid valve, E.C.U., Solenoid valve, Circuit tester. N.G. (not good) example and O.K. example shown.
    SEF599D
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