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Home >> Toyota >> 2012 >> Corolla S, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 208 (Automatic Transmission (U341E) (Diagnostic Codes (P0705 - P2759) & Circuit Tests)) >> Automatic Transaxle System >> DTC P0756: Shift Solenoid "B" Performance (Shift Solenoid Valve S2) >> System Description

System Description

WARNING: This page is about a different car, the 2011 Toyota Matrix. However, it is still accessible from the selected car via links, so may be relevant.

The ECM uses signals from the vehicle speed sensor and speed sensor NT to detect the actual gear position (1st, 2nd, 3rd or 4th gear).

Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect the mechanical problems of the shift solenoid valves, the valve body or automatic transaxle (clutch, brake or gear etc.).

DTC No. DTC Detection Condition Trouble Area
P0756 The gear required by the ECM does not match the actual gear when driving (2-trip detection logic)
  • Shift solenoid valve S2 remains open or closed
  • Valve body is blocked
  • Shift solenoid valve S2
  • Automatic transaxle (clutch, brake or gear etc.)