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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transmission Electronic Controlled (ECT) - U241E/U140F - Diagnostics) >> DTC P0746: Pressure Control Solenoid "A" Performance (Shift Solenoid Valve SL1) >> Monitor Description

Monitor Description

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The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual gear position (1st, 2nd, 3rd or O/D gear position). When the gear position commanded by the ECM and the actual gear position are not same, the ECM illuminates the MIL.

Example: When either condition (a) or (b) is met, the ECM detects a malfunction.

  1. The ECM commands the 1st gear, but the actual gear is 2nd.
  2. The ECM commands the 2nd gear, but the actual gear is 1st.
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