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

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.
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VARIABLE VALVE TIMING CONTROL

Outline
• The variable valve timing control of the Mazda6 (GG) is essentially carried over from the current MX-5 (NB)
ecept eecution condition for the cleaning mode and maimum cam retard mode to match the vehicle
characteristics.
Eecution 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]
Maimum 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
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FUEL INJECTION CONTROL

Outline
• There are two types of injection timing control: “synchronized injection” and “non-synchronized injection.”
• BARO and rear oygen 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/ehaust 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
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A/C CUT-OFF CONTROL

Outline
• The A/C cut-off control of the Mazda6 (GG) is essentially carried over from the current MPV (LW) FS engine
model ecept for operation condition.
F–36
CONTROL SYSTEM
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