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Home >> Chevrolet >> 2001 >> Impala Base, 3.8 K >> Repair and Diagnosis >> External Pages >> Different car >> Section 63 (Automatic Transaxle Diagnosis - 4T65-E) >> Diagnostic Tests >> DTC P0753: 1-2 Shift Solenoid Electrical Problem >> Circuit Description

Circuit Description

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

The 1-2 shift solenoid valve controls transmission fluid pressure acting on the 1-2 and 3-4 shift valves to position the valves for the appropriate gear. The 1-2 shift solenoid valve is a normally-open exhaust valve located on the control valve body. A fused circuit supplies ignition voltage to the 1-2 shift solenoid valve. The PCM commands the solenoid on or off by switching the ground path. When the 1-2 shift solenoid valve is commanded on, the PCM senses low voltage. When the 1-2 shift solenoid valve is commanded off, the PCM senses high voltage.

If the PCM detects a continuous open, short to ground or short to power in the 1-2 shift solenoid valve circuit, then DTC P0753 sets. DTC P0753 is a type "B" DTC.

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