Power Circuits

Using a voltmeter, check for battery voltage between ECU power terminal and ground. See POWER & GROUND CIRCUITS TERMINAL IDENTIFICATION table. See Fig 1 or Fig 2 . If battery voltage is not present, check appropriate ECU fuse in underhood fuse box. See ECU POWER CIRCUITS FUSE IDENTIFICATION table. If fuse is okay, check for an open in wire between underhood fuse box and appropriate ECU power circuit terminal.

Turn ignition switch to ON position. Using a voltmeter, check for battery voltage between appropriate ECU power circuit terminal and ground. See POWER & GROUND CIRCUITS TERMINAL IDENTIFICATION table. See Fig 1 or Fig 2 . If battery voltage is not present, check appropriate fuse in underhood fuse box. See ECU POWER CIRCUITS FUSE IDENTIFICATION table. If fuse is okay, check for an open in wire between fuse box and appropriate ECU power circuit terminal or check for a defective ignition switch.

POWER & GROUND CIRCUITS TERMINAL IDENTIFICATION

Application

⁽¹⁾ ECU Terminal

2.0L

Ground Circuits

A2, A4, A16 & A18

Power Circuits

Ignition Switch In OFF Position

A17

Ignition Switch ON Position

A13 & A15

2.1L

Ground Circuits

A23, A24, A26 & B2

Power Circuits

Ignition Switch In OFF Position

Ignition Switch ON Position

A25 & B1

⁽¹⁾	See Fig 1 or Fig 2 for terminal location identification.

ECU POWER CIRCUITS FUSE IDENTIFICATION

Application

⁽¹⁾ Fuse

Ignition Switch In OFF Position

CLOCK

Ignition Switch ON Position

EFI/ECU

⁽¹⁾	All fuses are in underhood fuse box.

Fig 1: Identifying ECU Terminals (2.1L)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: Identifying ECU Terminals (2.0L)

Courtesy of AMERICAN HONDA MOTOR CO., INC.