Check stoplight operation. If stoplights operate properly, go to step 3). If stoplights stay on, check stoplight switch. Repair or replace switch as necessary. If stoplights do not come on when brake pedal is depressed, check STOP, HORN fuse located in underhood fuse/relay box. See FUSE IDENTIFICATION . See WIRING DIAGRAMS article.
If fuse is okay, repair open in wire between fuse and stoplight switch. If wire is okay, check stoplight switch. If fuse in not okay, repair short in wire between fuse and stoplight switch. Replace STOP, HORN fuse.

Depress brake pedal and measure voltage between specified PCM terminals. See BRAKE SIGNAL TESTING . See Figure . See appropriate wiring diagram in the WIRING DIAGRAMS article. If battery voltage exists, brake signal is okay. If battery voltage does not exist, repair open in Green/White wire between PCM connector and brake switch.

FUSE IDENTIFICATION

Application	Fuse No. (Amps)
2.2CL	30 (20)

BRAKE SIGNAL TESTING

Application	Measure Between PCM Connector Terminals
2.2CL	A9 (BRN/BLK) & D5 (GRN/WHT)

NOTE: Fast idle thermo valve is factory adjusted and should not be disassembled.

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

Brake Switch Signal

Use the Manual With the Right Hardware

When to See a Mechanic

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