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Home >> Suzuki >> 2009 >> Equator Base, 4D Pickup >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (VQ40DE) - (4 Of 5) >> DTC P0128: Thermostat Function >> Diagnosis Procedure
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Diagnosis Procedure

DIAGNOSIS PROCEDURE

Step Action YES NO
CHECK ENGINE COOLANT TEMPERATURE SENSOR 
Refer to [P0128 THERMOSTAT FUNCTION ].
OK or NG 
GO TO 2. Replace engine coolant temperature sensor.
CHECK THERMOSTAT 
Refer to [WATER INLET AND THERMOSTAT ASSEMBLY: REMOVAL AND INSTALLATION ]
OK or NG 
INSPECTION END Replace thermostat.