Engine and Emission Control System Description - Acceleration Cut Control / Wastegate Valve Control
EF & EC-386prose procedureWastegate Valve Control applies to SR20DET only.
Acceleration Cut Control
INPUT/OUTPUT SIGNAL LINE
SYSTEM DESCRIPTION
When the accelerator pedal is fully depressed, the air conditioner is turned off for a few seconds. This system improves acceleration when the air conditioner is used.
Wastegate Valve Control (SR20DET only)
INPUT/OUTPUT SIGNAL LINE
SYSTEM DESCRIPTION
The wastegate valve control solenoid valve changes the source vacuum which activates the actuator. This results in a suitable turbo-pressure.
When detonation signs are detected, which means a low octane fuel is being used, the solenoid valve turns OFF, and turbocharger pressure becomes low.
OPERATION
Wastegate Valve Control Operation
• Engine stopped.
• C.P.U. of E.C.U. is malfunctioning.
• Detonation sensor is malfunctioning.
• Throttle valve is in idle position.
• Judged fuel quality: low octane (Detecting sign of detonation)
Wastegate valve control solenoid valveOFF (When any of the conditions at left are present.)
Vacuum to wastegate valve actuatorLeads to wastegate valve actuator.
Turbocharger pressureLow
Except the above
Wastegate valve control solenoid valveON
Vacuum to wastegate valve actuatorLeads to suction pipe & wastegate valve actuator.
Turbocharger pressureHigh