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Home >> Toyota >> 2022 >> RAV4 LE, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 52 (Engine Control System (A25A-FXS) (W/ Canister Pump Module) - Diagnostic Codes (07 Of 13)) >> SFI SYSTEM (w/ Canister Pump Module) >> DTC P0597-14: Thermostat Heater Control Circuit Short to Ground or Open [02/2019 - 06/2020] >> Monitor Description

Monitor Description

WARNING: This page is about a different car, the 2020 Toyota RAV4 and 2019 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

The ECM monitors the output voltage while the thermostat heater is operating.

The thermostat heater turns on and off according to ON/OFF switching of a transistor inside the ECM.

If a continuous mismatch occurs between the ECM transistor state and the output voltage, the ECM determines there is a malfunction in the thermostat heater circuit and stores a DTC.

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