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 i n 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, ⁽²⁾ D10 & ⁽²⁾ D12

Ignition Switch In ON Position

⁽²⁾ A12, A13, A25 & B1

⁽¹⁾	For terminal location, see Fig 1 .

⁽²⁾	For Odyssey models.

ECM POWER CIRCUIT FUSE IDENTIFICATION

Application	Fuse
Ignition Switch In OFF Position	BACK-UP
Ignition Switch In ON Position	ECM

Fig 1: Identifying ECM Terminals (1.6L)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

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.

Safety Warning

Power Circuits