Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHONDA1994CIVIC DX, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLSENGINE CONTROL MODULE (ECM)POWER CIRCUITS
1994 Honda Civic DX, 4D Sedan, Automatic
Power Circuits
1994 Honda Civic DX, 4D Sedan, AutomaticSECTION Power Circuits
- 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.
- 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 | |||
|
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ECM POWER CIRCUIT FUSE IDENTIFICATION
| Application | Fuse | |
|---|---|---|
| Civic & Civic Del Sol | ||
| Ignition Switch In OFF Position | BACK-UP | |
| Ignition Switch In ON Position | ECM | |
RENDER: 1.0x
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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.