Nissan 200SX S13 silhouetteS13

TROUBLE DIAGNOSES — Diagnostic Procedure (Cont'd)

EF & EC-79prose procedure
Continued from EF & EC-78

Diagnostic Procedure (Cont'd)

  1. 7
    When measuring supply voltage of E.C.U. controlled components 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 power transistor of the control unit.
    If the two tester probes accidentally make contact with each other during measurement, the circuit will be shorted, resulting in damage to the power transistor of the control unit.
    Illustration showing incorrect (N.G.) method of measuring ECU supply voltage with two tester probes touching each other causing a short at the harness connector for solenoid valve, versus correct (O.K.) method with probes separated using a circuit tester. Components labeled: Battery voltage, Short, Harness connector for solenoid valve, E.C.U., N.G., Solenoid valve, O.K., Circuit tester.
    SEF599D
  2. 8
    Improve tester probe as shown to perform test easily.
    Illustration showing an improved tester probe with a thin wire attached to the tip to allow easier access during testing.
    SEF050F
  3. 9
    For the first trouble-shooting procedure, perform POWER SOURCE & GROUND CIRCUIT FOR E.C.U. check.
Support our work!

See also

POWER SOURCE & GROUND CIRCUIT FOR E.C.U.

Search Manual

Search pages, specs, and procedures