Mazda 6 - A;C Cut-Off Control; Fuel Injection Control; Variable Valve Timing Control

F36
CONTROL SYSTEM
Operation Conditions
• The PCM turns the VTCS solenoid valve ON to close the VTCS shutter valve in the intake manifold when all of
the following conditions are met:
 Engine speed: below 3,750 rpm
 Throttle opening angle is below as followings:
Below 1,500 rpm: CTP
Between 2,000 rpm and 3,000 rpm: 2629%
Above 2,500 rpm: WOT
ECT below 63 °
°°
°C [145 °
°°
°F]
• The PCM turns the VTCS solenoid valve OFF for maintaining the startability and stability during the engine
cranking and for 0.2 second after engine started.
End Of Sie
VARIABLE VALVE TIMING CONTROL
A6E394018881T11
Outline
• The variable valve timing control of the Mazda6 (GG) is essentially carried over from the current MX-5 (NB)
except execution condition for the cleaning mode and maximum cam retard mode to match the vehicle
characteristics.
Execution condition
Cleaning mode
• When all of the following conditions are met.
 Decrease the engine speed with CTP
 Engine speed: between 2,250 rpm and 3,500 rpm
ECT: above 80 °
°°
°C [176 °
°°
°F]
Maximum cam retard mode
• When any of the following conditions are met.
Cranking
 Engine speed: below 970 rpm
ECT: below 18 °
°°
°C [64 °
°°
°F]
 Target valve timing: 0
 Torque reduction is activating by TCS
End Of Sie
FUEL INJECTION CONTROL
A6E394018881T12
Outline
• There are two types of injection timing control: synchronized injection and non-synchronized injection.
• BARO and rear oxygen sensor feedback correction has been added.
Injection Timing
Synchronized injection
• PCM determines fuel injection timing and amount synchronized with the crank angle, and based on the
following signals during the intake/exhaust stroke of each cylinder.
 CKP, MAF, ECT, IAT
Non-synchronized injection
• PCM determines fuel injection timing and amount based on the following signals (not synchronized with the
crankangle).
 TP, MAF, ECT, IAT
Correction
BARO correction
• Purpose: to maintain the engine stability
• Conditions: at all time
• Action: lower BARO, larger correction
Rear HO2S feedback correction
• Purpose: to control air/fuel ratio close to increase the performance of the catalytic converter
• Conditions: at feedback zone
• Action: Rear HO2S output voltage
End Of Sie
A/C CUT-OFF CONTROL
A6E394018881T13
Outline
• The A/C cut-off control of the Mazda6 (GG) is essentially carried over from the current MPV (LW) FS engine
model except for operation condition.