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Home >> Infiniti >> 2017 >> QX30 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (4 Of 5) >> DTC/Circuit Diagnosis >> DTC P0638: Throttle Valve Actuator Control >> DTC Description >> DTC Detection Logic

DTC Detection Logic

DTC No. CONSULT screen terms DTC detecting condition
DTC
(Trouble diagnosis content)
Malfunction type
P0638 84 THROTTLE ACTUATOR B1
(Throttle actuator control range/performance bank 1)
SIG BELOW ALLOWABLE RANGE The output for the throttle valve actuator (cylinder bank 1) has a malfunction. There is a signal below the permissible limit value.
85 SIG ABOVE ALLOWABLE RANGE The output for the throttle valve actuator (cylinder bank 1) has a malfunction. There is a signal above the permissible limit value.