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Home >> Pontiac >> 2004 >> Sunfire Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 153 (Automatic Transaxle - 4T40-E/4T45-E Diagnosis (DTC P0748 (3.4L) To P1887)) >> Diagnostic Information and Procedures >> DTC P1811 (2.2L and 3.4L) >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2004 Pontiac Grand Am and 2004 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.

The powertrain control module (PCM) modifies the transmission line pressure through the pressure control (PC) solenoid valve, in order to control shift execution time and shift consistency. The PCM monitors various inputs, and modifies the shift execution and timing by applying a calculated duty cycle to the PC solenoid valve. The PCM alters the shifting based on driving habits, transmission load, and internal transmission condition.

When the PCM detects long shifts that cannot be shortened by shift adapts during the same ignition cycle, then DTC P1811 sets. DTC P1811 is a type C DTC.

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