DTC P1569: Variable Tumble Control System Solenoid Valve Circuit, Low Input: Condition

WARNING: This page is about a different car, the 2002 Mazda Protege5 and 2002 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.

DTC is set when PCM detects low voltage input from Variable Tumble Control System (VTCS) solenoid valve when VTCS solenoid valve is off. This is a continuous monitor. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:

Open or Short circuit between VTCS solenoid valve and PCM.
Open circuit between VTCS solenoid valve and main relay.
VTCS solenoid valve malfunction.
PCM malfunction.