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Home >> Mazda >> 1992 >> MPV Base, 3D Van Cargo >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - System/Component Tests - EFI >> Computerized Engine Controls >> Engine Control Unit (Except NAVAJO)
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Engine Control Unit (Except NAVAJO)

  1. Locate Engine Control Unit (ECU). See ECU LOCATION  table. Connect Engine Signal Monitor (49-9200-162) to ECU. See Fig 1 . Check voltage at each terminal of ECU. If input and output component voltage readings are not as specified, check faulty component. See PIN VOLTAGE CHART S article, TESTS W/CODES - EXCEPT NAVAJO article and testing for appropriate component in this article.
  2. If input and output component voltages are as specified, and ECU voltage is incorrect, replace ECU.
CAUTION: DO NOT apply voltage to terminals "A" and "B" of engine signal monitor. See Fig 1 .
ECU LOCATION

Application Location
B2200, B2600i & 929 Behind Passenger Front Side Trim Panel
Miata & MPV Under Passenger Front Floor Mat
MX-3, Protege & 323 Behind Driver & Passenger Front Side Walls
MX-6 & 626 Behind Passenger Side Console Cover
Fig 1: Testing Engine Control Unit ECU
G92B24985Courtesy of MAZDA MOTORS CORP.
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