Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2002 Ford ZX2 AutomaticFACTORY OEM SERVICE PROCEDURE
Diagnostic Procedure
- Turn ignition switch to OFF position. Disconnect shift interlock actuator harness connector. Measure the resistance between the shift interlock actuator harness connector terminal No. 1 and ground. Is the resistance less than 5 ohms? If so, go to next step. If not, repair open in Black wire and test the system for normal operation.
- Turn ignition switch to ON position. Measure the voltage between the shift interlock actuator harness connector terminal No. 2 and ground. Depress the brake pedal. Is the voltage less than one volt with the brake pedal depressed, and greater than 10 volts with the brake pedal released? If so, replace shift interlock actuator and test the system for normal operation. See SHIFT INTERLOCK ACTUATOR under REMOVAL & INSTALLATION. If not, go to next step.
- Turn ignition switch to OFF position. Disconnect Brake Pedal Position (BPP) switch. Measure the resistance between the shift interlock actuator harness connector terminal No. 2 and the BPP switch harness connector terminal No. 2. Is the resistance less than 5 ohms? If so, go to next step. If not, repair open in White wire and test the system for normal operation.
- Turn ignition switch to ON position. Measure the voltage between the BPP switch harness connector terminal No. 1 and ground. Is the voltage greater than 10 volts? If so, replace BPP switch and test the system for normal operation. See BRAKE PEDAL POSITION SWITCH under REMOVAL & INSTALLATION. If not, repair open in Blue wire and test the system for normal operation.
Factory Service Tools
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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.