Check for battery voltage between PCM power terminal and ground. See POWER & GROUND CIRCUIT TERMINAL IDENTIFICATION . See Fig 1 . If battery voltage does not exist, check appropriate PCM fuse in underhood fuse box. See PCM POWER CIRCUIT FUSE IDENTIFICATION . If fuse is okay, check for an open in wire between underhood fuse box and appropriate PCM power circuit terminal. See WIRING DIAGRAMS section.

Turn ignition on. Check for battery voltage between appropriate PCM power circuit terminal and ground. See POWER & GROUND CIRCUIT TERMINAL IDENTIFICATION . If battery voltage does not exist, check appropriate fuse in underhood fuse box. See PCM POWER CIRCUIT FUSE IDENTIFICATION . If fuse is okay, check for open in wire between fuse box and appropriate PCM power circuit terminal, and check for defective ignition switch. See WIRING DIAGRAMS section.

POWER & GROUND CIRCUIT TERMINAL IDENTIFICATION

Application

⁽¹⁾ PCM Terminal

Ground Circuits

A9, A10, A22, A23, D11 & D12

Power Circuits

Ignition Switch In OFF Position ⁽²⁾

C10

Ignition Switch In ON Position

A11 & A24

⁽¹⁾	Use illustration for terminal location. See Fig 1 .

⁽²⁾	Back-up power supply.

PCM POWER CIRCUIT FUSE IDENTIFICATION

Application	Fuse
Ignition Switch In OFF Position	BACK-UP
Ignition Switch In ON Position	ECU (ECM/PCM)

Fig 1: PCM Harness Connector Terminal ID

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

Use the Manual With the Right Hardware

When to See a Mechanic

Rather have a pro handle this?