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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1568 (Automatic Transmission - 5AT - DTC P0218 To DTC P0761) >> DTC P0731 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

While driving in 1st gear, line pressure is supplied to the 1st clutch piston, the 1st clutch engages and the shaft and 1st gear rotate together to transmit drive force. The oil pressure is supplied to the 1st clutch via the suction filter, oil pump, main regulator, manual valve, shift valve, feed pipe and clutch piston. The powertrain control module (PCM) calculates the automatic transmission input shaft speed (AT ISS) sensor to automatic transmission output shaft speed (AT OSS) sensor ratio.

When the PCM detects an incorrect calculated ratio for 1st gear, while the PCM is commanding 1st gear, DTC P0731 sets. DTC P0731 is a type C DTC.

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