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Home >> Saturn >> 2002 >> LW300 >> Repair and Diagnosis >> External Pages >> Different car >> Section 314 (Automatic Transaxle - 4T40-E/4T45-E - Diagnosis (DTC P0218 To DTC P0717)) >> Diagnostic Trouble Codes >> DTC P0502 (2.2L (L61)) >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Saturn LW300, 2003 Saturn LW200, 2003 Saturn L300, and 2003 Saturn L200. However, it is still accessible from the selected car via links, so may be relevant.

The automatic transmission output shaft speed sensor (AT OSS) provides vehicle speed information to the PCM. The AT OSS is a permanent magnet generator mounted to the transmission case. The AT OSS produces an AC voltage as the transmission speed sensor rotor teeth pass through the magnetic field of the sensor. The AC voltage level increases as the speed of the vehicle increases. The PCM converts the AC voltage into a digital signal. The PCM uses the vehicle speed signal to determine shift timing, torque converter clutch (TCC) apply, TCC release, and gear ratio calculations.

When the PCM detects a low output speed and the vehicle has a large engine speed in a drive gear, then DTC P0502 sets. DTC P0502 is a type B DTC.

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