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Home >> Toyota >> 2019 >> RAV4 LE, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (A25A-FKS) (W/O Canister Pump Module) - Diagnostic Codes (2 Of 4) >> SFI SYSTEM (w/o Canister Pump Module) >> DTC P0597-14: Thermostat Heater Control Circuit Short to Ground or Open [11/2018 - 08/2020] >> Monitor Description
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Monitor Description

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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