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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 220 (Automatic Transaxle Diagnosis - 4T65-E) >> Diagnostic Tests >> DTC P0503: Vehicle Speed Sensor Circuit Performance >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The VSS system is a pulse generator consisting of a speed sensor assembly, located in the case extension, and a toothed VSS reluctor wheel, which is pressed onto the final drive carrier assembly. As the vehicle drives forward, the VSS reluctor wheel rotates. This rotation produces a variable AC signal in the pickup coil that is proportional to vehicle speed. The PCM uses this signal to calculate vehicle speed, shift timing and gear ratios.

If the PCM detects a large change in vehicle speed in a short period of time, then DTC P0503 sets. DTC P0503 is a type "B" DTC.

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