DTC P0973 Shift Solenoid "A" Control Circuit Low (Shift Solenoid Valve S1); DTC P0974 Shift Solenoid "A" Control Circuit High (Shift Solenoid Valve S1): Description
WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.
Shifting from 1st to 4th is performed in combination with the ON and OFF operations of shift solenoid valves S1 and S2 which are controlled by the ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be driven smoothly.
(If an open or short circuit occurs, the ECM stops sending currents to the affected circuit.)
Fail-safe function (See FAIL-SAFE CHART ).
DTC DETECTION CONDITION CHART
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0973 | ECM detects short in solenoid valve S1 circuit 4 times when solenoid valve S1 is operated. (1-trip detection logic) |
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| P0974 | ECM detects open in solenoid valve S1 circuit 4 times when solenoid valve S1 is not operated. (1-trip detection logic) |
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