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Home >> Mazda >> 1987 >> 323 Base, 2D Hatchback >> Repair and Diagnosis >> Engine Performance >> System >> Fuel INJ - MPFI System >> Testing >> Electronic Control Unit >> 626 & 626 Turbo

626 & 626 Turbo

  1. Test computer control system, using Digital Code Tester (49 G030 920), before testing electronic control unit. Connect voltmeter negative lead to ground. Turn ignition on and measure voltage at each ECU terminal. DO NOT probe directly on ECU side of connectors. Always insert probe on back side of connectors.
  2. See CONTROL UNIT TESTING chart for 626 voltage specifications. See CONTROL UNIT TESTING chart for 626 Turbo voltage specifications. If voltage at terminal(s) is (are) incorrect, check system components, wiring harnesses, and terminals of suspect components before replacing ECU.
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