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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Automatic Transaxle Diagnosis - 4T65-E) >> Diagnostic Tests >> DTC P0752: 1-2 Shift Solenoid Performance >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Buick Regal, 2002 Buick Century, 2001 Buick Regal, and 2001 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The 1-2 shift solenoid valve is supplied with fused ignition voltage. The ground path is controlled by the PCM. When the PCM commands the solenoid off, a ground path is not provided and the filtered line pressure that is fed to the solenoid is exhausted. When the PCM commands the solenoid on, a ground path is provided and the exhaust port is blocked, stopping the exhaust of line pressure.

The PCM identifies a 1-2 shift solenoid valve condition by monitoring the commanded gear versus gear ratio.

If the PCM detects a 1st gear ratio when 2nd gear is commanded and a 4th gear ratio when 3rd gear is commanded, then DTC P0752 sets. DTC P0752 is a type "B" DTC.

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