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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 874 (Automatic Transaxle Diagnosis, Service & Repair - 4T65-E) >> Diagnostic Information and Procedures >> DTC P0756: Gear Ratio Mismatch >> Circuit Description

Circuit Description

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

The 2-3 shift solenoid (2-3 SS) 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 2-3 SS valve performance condition by monitoring the commanded gear versus the gear ratio. Refer to SHIFT SOLENOID VALVE STATE AND GEAR RATIO  .

If the PCM detects a 4th gear ratio when 1st gear is commanded and a 3rd gear ratio when 2nd gear is commanded, then DTC P0756 sets. DTC P0756 is a type A DTC.

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