Mazda 6. Manual — part 25
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.
CONTROL SYSTEM
F–37
F
Operation Conditions
•
While A/C is operating, the PCM cuts off the power supply to the A/C relay as shown below.
End Of Sie
ELECTRIC FAN CONTROL
A6E394018881T14
Operation
L8, LF (Intensely hot area) and L3 engine models
ON: Energized
OFF: De-energized
A/C cut-off condition
A/C cut-off time
Purpose
During cranking
For approx. 4.0 s
Startability improvement
Throttle valve is open more than 50%
For approx. 5.0 s
Acceleration performance
improvement
ECT is above 113
°
C {235
°
F}
Alternates between on and off for 10 seconds
until ECT falls to 107
°
C {225
°
F}
Engine reliability improvement
ECT is above 118
°
C {244
°
F}
Until engine ECT falls below 113
°
C {235
°
F}
Condition
PCM terminal 4L
PCM terminal 4B
PCM terminal 4F
Operation condition
Cooling fan
motor No. 1
Cooling fan
motor No. 2
Stopped
Stopped
OFF
OFF
OFF
A/C: OFF
ECT: below 100
°
C [176
°
F]
Low speed
Low speed
ON
ON
OFF
A/C: OFF
ECT: 100—108
°
C [212—226
°
F]
High speed
High speed
ON
ON
ON
A/C: OFF
ECT: above 108
°
C [226
°
F]
Low speed
Low speed
ON
ON
OFF
A/C: ON (middle switch OFF)
ECT: below 108
°
C [226
°
F]
High speed
Middle speed
ON
OFF
ON
A/C: ON (middle switch ON)
ECT: below 108
°
C [226
°
F]
High speed
High speed
ON
ON
ON
A/C: ON
ECT: above 108
°
C [226
°
F]
F–38
CONTROL SYSTEM
.
L8, LF (General area) engine models
.
•
The PCM energized the cooling fan relay No. 1
and No. 2 (with A/C system) except all of
following condition are met.
— ECT: below 100
°
C [176
°
F]
— A/C: OFF (with A/C system)
End Of Sie
CONTROLLER AREA NETWORK (CAN)
A6E394018881T15
•
PCM transmit/received the information in the CAN. For detail information of the CAN, see the “MULTIPLEX
COMMUNICATION SYSTEM.” (See
A6E3940T220
1
Cooling fan motor No. 1
2
Cooling fan motor No. 2
3
Cooling fan relay No. 1
4
Cooling fan relay No. 2
5
Cooling fan relay No. 3
6
Cooling fan relay No. 4
7
PCM
8
L3 engine models
9
LF, L8 engine models (Intensely hot area)
1
Cooling fan motor No. 1
2
Cooling fan motor No. 2
3
Cooling fan relay No. 1
4
Cooling fan relay No. 2
5
PCM
6
With A/C system
A6E3940T221
CONTROL SYSTEM
F–39
F
Transmit Information
•
Torque reduction inhibit
•
Engine speed
•
Vehicle Speed
•
TP
•
ECT
•
Travelled distance
•
Fuel injection amount
•
MIL condition
•
Generator warning light conditions
•
Engine displacement
•
Number of cylinders
•
Air induction type
•
Fuel type and delivery
•
Country
•
Transmission/axle type
•
Tire circumference (front/rear)
•
Desired gear/change lever position
•
HOLD switch conditions
Received Information
•
Wheel Speed from ABS HU/CM, ABS/TCS HU/CM, or DSC HU/CM
— Front Left
— Front right
— Rear left
— rear right
•
Travelled distance from ABS HU/CM, ABS/TCS HU/CM, or DSC HU/CM
•
Brake system status from ABS HU/CM, ABS/TCS HU/CM, or DSC HU/CM
•
Torque reduction request from ABS/TCS HU/CM, or DSC HU/CM
•
Brake system configuration from ABS HU/CM, ABS/TCS HU/CM, or DSC HU/CM
End Of Sie
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