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 SYSTEMSDESCRIPTION AND OPERATIONDISTRIBUTOR IGNITION (DI) SYSTEMOPERATION
2001 Chevrolet Express 1/2 Ton Van V6-4.3L VIN W
Operation
2001 Chevrolet Express 1/2 Ton Van V6-4.3L VIN WSECTION Operation
This electronic ignition system is known as a High Voltage Switch (HVS) distributor ignition system. Trigger information is supplied only by the CKP sensor. The CMP HVS is located inside the distributor, and is used for fuel injector sequencing and misfire diagnosis. There is no back-up or by-pass system used, so the engine will not run without a valid CKP input. The PCM signals the coil to fire through the IC module. The resulting secondary energy is distributed to the spark plugs by a conventional distributor cap and rotor assembly.
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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.