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HOMESERVICE MANUALSHONDA1994PRELUDE VTECREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLSENGINE CONTROL MODULE (ECM)POWER CIRCUITS
1994 Honda Prelude VTEC

Power Circuits

1994 Honda Prelude VTECSECTION Power Circuits
  1. Check for battery voltage between ECM power terminal and ground. See POWER & GROUND CIRCUIT TERMINAL IDENTIFICATION  table. See Fig 1 . If battery voltage does not exist, check appropriate ECM fuse in underhood fuse box. See ECM POWER CIRCUIT FUSE IDENTIFICATION  table. If fuse is okay, check for an open in wire between underhood fuse box and appropriate ECM power circuit terminal.
  2. Turn ignition on. Check for battery voltage between appropriate ECM power circuit terminal and ground. See POWER & GROUND CIRCUIT TERMINAL IDENTIFICATION  table. If battery voltage does not exist, check appropriate fuse in underhood fuse box. See ECM POWER CIRCUIT FUSE IDENTIFICATION  table. If fuse is okay, check for open in wire between fuse box and appropriate ECM power circuit terminal, and check for defective ignition switch.
    POWER & GROUND CIRCUIT TERMINAL IDENTIFICATION

    Application (1) ECM Terminal
    Ground Circuits A23, A24, A26 & B2
    Power Circuits
    Ignition Switch In OFF Position D1
    Ignition Switch In ON Position A25 & B1
    (1) For terminal location, see Fig 1 .
    ECM POWER CIRCUIT FUSE IDENTIFICATION

    Application Fuse
    Prelude
    Ignition Switch In OFF Position CLOCK
    Ignition Switch In ON Position BACK-UP
    Fig 1: Identifying ECM Terminals
    G93I79051Courtesy of AMERICAN HONDA MOTOR CO., INC.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.