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Relay is mounted to ECM, under glove compartment. Turn ignition off. Check for battery voltage on White wire terminal of relay. If battery voltage is present, go to next step. If battery voltage is not present, check White wire circuit between relay and battery, including fuse No. 7.
Turn ignition on. Check for battery voltage on Black/White wire terminal of relay. If battery voltage is present, go to next step. If battery voltage is not present, check Black/White wire circuit between relay and battery, including fuse No. 8.
Turn ignition off. Disconnect negative battery cable. Disconnect relay connector and remove relay. At relay side of connector, check continuity between White wire terminal and Blue/Black wire terminal. If continuity exists, replace relay. If continuity does not exist, go to next step.
Check continuity between Black/White wire terminal and Black wire terminal. If resistance is 56-84 ohms, go to next step. If resistance is not within specification, replace relay.
Energize relay by applying battery voltage to Black/White wire terminal and ground to Black wire terminal. With relay energized, if continuity does not exist between White wire terminal and Blue/Black wire terminal, replace relay.

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

EFI Main Relay (Samurai)