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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 65 (Automatic Transmission Diagnosis - 4L60-E) >> Diagnostic Tests >> DTC P0503: VSS Circuit - Intermittent >> Circuit Description

Circuit Description

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Vehicle speed is signaled to PCM by Vehicle Speed Sensor (VSS). Sensor is a Permanent Magnet (PM) generator mounted to transmission case extension. PM generator produces an AC voltage as speed sensor rotor teeth pass sensor's magnetic field. PCM converts AC voltage into a digital signal. PCM uses vehicle speed to determine shift timing and TCC apply and release. DTC P0503 is set if PCM detects a large drop in vehicle speed.

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