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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 72 (Automatic Transmission Diagnosis - 4L80-E (Diesel)) >> Diagnostic Tests >> DTC P0723: OSS Sensor Circuit - Intermittent >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 GMC Cab & Chassis Sierra and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The speed sensor circuit consists of a magnetic induction type sensor (which is the OSS) a VSS buffer module, and wiring. Gear teeth pressed onto the output shaft carrier assembly induce an alternating voltage into the sensor. This signal transmits to the VSS buffer module. The VSS buffer module compensates for various final drive ratios. The VSS buffer module also converts the AC OSS signal into a 40 pulse per revolution 5-volt DC square waveform signal to indicate transmission output speed.

If the PCM detects an unrealistically large change in the OSS reading, then DTC P0723 sets. DTC P0723 is a type "B" DTC.

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