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17.4.12 H53 (Aluminium Electric Heater (Heatcharge) Temperature Sensor Error)
Troubleshooting
Diagnosis Procedures and Cause
Measures to be Taken
For the heat exchanger temperature sensor of some models, the sensor is not connected by a
connector but it is directly soldered to the board.
In this case, replace the control board.
No abnormality is observed
No abnormality is observed
An abnormality is observed
Disconnection/Imperfect
connection of the connector
Check for bad connection of the sensor connector.
Fix the problem.
Replace the sensor.
Replace the control board.
Check for the characteristics of the sensor.
Refer to the characteristic table for electronic circuit diagram.
(Remove the connector and check the resistance value of the sensor.)
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