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.
2000 Chevrolet Express 3/4 Ton Van V8-305 5.0L VIN M SFIFACTORY OEM SERVICE PROCEDURE
Scan Tool Data Definitions - Antitheft Systems
Auto Learn Timer: The scan tool displays the seconds used by the Passlock(TM) module to learn valid code from the Passlock(TM) sensor. The learn procedure consists of 3 consecutive periods.
Battery Voltage: The scan tool displays the battery system voltage.
Ignition 1: The scan tool displays the state of the ignition switch. The scan tool displays ACTIVE when the ignition switch is in the RUN or CRANK position.
Ignition 3: The scan tool displays the state of the ignition switch. The scan tool displays ACTIVE when the ignition switch is in the RUN position.
Passlock(TM) Code: The scan tool displays the validity of the Passlock(TM) code received by the Passlock(TM) module. The scan tool displays OPEN, SHORTED, TAMPER and a valid code as a numeric value (1-10).
Passlock(TM) Data Voltage: The scan tool displays the voltage code from the Passlock(TM) sensor to the Passlock(TM) module. The Passlock(TM) module determines if the voltage received is a valid or invalid code voltage.
Passlock(TM) Power: The scan tool displays the 12v reference voltage at the Passlock(TM) module. The Passlock(TM) module determines if the monitored voltage is valid or invalid.
Passlock(TM) State: The scan tool displays the state of the Passlock(TM) system.
Security Lamp Feedback: The scan tool displays the feedback voltage at the Passlock(TM) module. The Passlock(TM) module determines if the monitored voltage is valid or invalid.
Security Lamp State: The scan tool displays the state of the SECURITY lamp. The scan tool displays ON, OFF or FLASHING.
Tamper Timer: The scan tool displays the time remaining when in the tamper mode. The timer starts when the ignition switch is turned to the RUN position and the Passlock(TM) module receives a Passlock(TM) data voltage different from the last learned voltage. The timer has a delay of 10 minutes and will stay active even if the ignition switch is cycled from the RUN to the OFF position.
Battery Voltage: The scan tool displays the battery system voltage.
Ignition 1: The scan tool displays the state of the ignition switch. The scan tool displays ACTIVE when the ignition switch is in the RUN or CRANK position.
Ignition 3: The scan tool displays the state of the ignition switch. The scan tool displays ACTIVE when the ignition switch is in the RUN position.
Passlock(TM) Code: The scan tool displays the validity of the Passlock(TM) code received by the Passlock(TM) module. The scan tool displays OPEN, SHORTED, TAMPER and a valid code as a numeric value (1-10).
Passlock(TM) Data Voltage: The scan tool displays the voltage code from the Passlock(TM) sensor to the Passlock(TM) module. The Passlock(TM) module determines if the voltage received is a valid or invalid code voltage.
Passlock(TM) Power: The scan tool displays the 12v reference voltage at the Passlock(TM) module. The Passlock(TM) module determines if the monitored voltage is valid or invalid.
Passlock(TM) State: The scan tool displays the state of the Passlock(TM) system.
Security Lamp Feedback: The scan tool displays the feedback voltage at the Passlock(TM) module. The Passlock(TM) module determines if the monitored voltage is valid or invalid.
Security Lamp State: The scan tool displays the state of the SECURITY lamp. The scan tool displays ON, OFF or FLASHING.
Tamper Timer: The scan tool displays the time remaining when in the tamper mode. The timer starts when the ignition switch is turned to the RUN position and the Passlock(TM) module receives a Passlock(TM) data voltage different from the last learned voltage. The timer has a delay of 10 minutes and will stay active even if the ignition switch is cycled from the RUN to the OFF position.
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.
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