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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transmission - MVB 4 Speed) >> Diagnostic Information and Procedures >> DTC P0787 or P0788 >> Circuit Description

Circuit Description

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Shift solenoid valve ST is switched ON/OFF by a signal from the engine control module (ECM) so that letting in or out timing of the 2nd brake is adjusted by operating orifice control valve. Therefore, shift solenoid valve ST operates when letting in or out reverse clutch.

If the shift solenoid valve ST is broken, the shift shock becomes big.

When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem, and illuminates the MIL and stores the DTC. The ECM performs the fail-safe and turns on the other shift solenoid valves in good condition.

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