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.
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HOMESERVICE MANUALSCHEVROLET2001EXPRESS 1/2 TON VAN V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL TESTING & PROCEDURES - ANTITHEFT SYSTEMSSCAN TOOL DATA DEFINITIONS
2001 Chevrolet Express 1/2 Ton Van V6-4.3L VIN W
Scan Tool Data Definitions
2001 Chevrolet Express 1/2 Ton Van V6-4.3L VIN WSECTION Scan Tool Data Definitions
SECURITY DATA
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.
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 12 V 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.
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.
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 12 V 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.
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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.