P0640 Lexus Manifold Intake Air Heater
Possible causes
– Faulty Intake Air Heater
– Intake Air Heater harness is open or shorted
– Intake Air Heater circuit poor electrical connection
– Intake Air Heater harness is open or shorted
– Intake Air Heater circuit poor electrical connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0640 Lexus Description
The intake air (IA) heater is located in the air inlet tube and is used to warm the incoming air to aid in starting the engine and for proper cylinder combustion. The glow plug control module (GPCM) will command the IA heater ON when the engine coolant temperature is below 40 C (104 F). The power to the IA heater is supplied by the battery positive voltage circuit.
Lexus Vehicle:Lexus ES,Lexus GS,Lexus GX,Lexus HS,Lexus IS,Lexus LFA,Lexus LS,Lexus LX,Lexus RX,Lexus RX,Lexus SC,Lexus GS350,Lexus GS450H,Lexus IS250,Lexus GX460,Lexus IS350,Lexus LS460,Lexus LS600H,Lexus LX570,Lexus RX350