Mazda X-5. Manual — part 35
CONTROL SYSTEM
01–40–13
01–40
DRIVE-BY-WIRE CONTROL OPERATION [LF]
E5U014000000N60
Idle Speed Control
• Controls the throttle valve opening angle so that it is close to the target idle speed calculated by the PCM.
• The PCM calculates the target throttle opening angle by adding each type of correction to the basic duty value
which is the basis of the throttle valve opening angle, and then sends a duty signal to the throttle valve actuator.
The basic duty value is determined by the target engine speed.
• Each type of correction is as follows.
Correction
Accelerator Control
• Controls the throttle valve opening angle through control of the throttle valve actuator, according to the amount
of AP depression.
• The PCM controls the throttle valve actuator so that the actual throttle valve opening angle is close to the target
throttle valve opening angle.
• The final throttle valve opening angle is determined by the sum of the target throttle opening angle during idling
and the target throttle valve opening angle during regular driving.
• The target throttle valve opening angle during regular driving is determined based on the transmission gear
position, the amount of AP depression and the engine speed. If the target throttle opening angle is at the fixed
value or less during regular driving, the PCM switches to idle speed control.
• The PCM sets the throttle valve to the fully-closed position when the ignition switch is on or off and executes the
idle position learning function to learn the throttle valve position. Due to this, changes in the throttle valve
opening angle due to age deterioration are corrected.
• When the ignition switch is off, a main relay on request is output and the fully-closed learning function is
executed. (See 01–40–11 MAIN RELAY CONTROL OPERATION [LF].)
Correction
Purpose
Condition
Amount of Correction
Correction
Target
Conditions
Correction amount
A/C load correction
Prevents decrease in idle speed due to
A/C operation.
A/C is operating.
A/C operation
time
→correction
Electrical load
correction
Prevents decrease in idle speed due to
electrical load operation.
Idle speed during electrical
load operation and under any
condition during driving
High electrical load
→large
correction
D-range correction
(AT)
Prevents decrease in idle speed due to
shifting into D-range
D-range signal is input.
Low idle speed when shifted
to D range
→large correction
Dashpot correction
Prevents decrease in idle speed due to
insufficient intake air amount during
deceleration.
Decelerated
High engine speed
→large
correction
Correction at engine
start
Prevents decrease in idle speed after
engine start.
After cranking and engine
start
Low ECT
→large correction
Hot engine restart
correction
Prevents decrease in idle speed from
hot engine restart.
Just after cranking and engine
start when the ECT is 60
°C
{140
°F} or more the IAT is 50
°C {122 °F} or more
High intake airflow
temperature
→large correction
Feedback correction
A
Sets idle speed to target engine speed. Idle speed during idling
(vehicle is stopped) is over or
under the target engine speed
(except during test mode
when the engine speed is 300
rpm or less).
Actual idle speed
Target engine speed or
less
→volume increase
correction
Target engine speed or
more
→volume decrease
correction
Feedback correction
B
Sets to the target engine speed when
the idle speed has decreased in the
range not corrected by feedback
correction A, and prevents a decrease
in idle speed.
During deceleration at fully
closed throttle, the engine
speed is the target engine
speed or more and when the
feedback correction A is not
performed (except during test
mode).
Large difference between
actual idle speed and target
engine speed
→large
correction
Engaged coasting
clutch volume
increase correction
Reduces shock when the transaxle
coasting clutch is engaged.
When coasting clutch is
engaged.
High vehicle speed
→large
correction
Learning correction
Stores intake air volume changes
based on differences between engines
and changes due to aged deterioration,
and feedback.
During feedback correction A
when ECT is 85
°C {185 °F} or
more.
During idling
→average value
of feedback correction A
CONTROL SYSTEM
01–40–14
Traction Control
• The PCM calculates the target throttle valve opening angle by the torque up/down request signal from the DSC
HU/CM and TCM and the engine speed.
Cruise Control
• Calculates the throttle valve opening angle based on the deviation of the actual vehicle speed from the set
vehicle speed which was set with the cruise control switch and sends a duty signal to the throttle valve actuator.
• The PCM controls the actual vehicle speed so that it is close to the set vehicle speed.
• The cruise control includes the cruise control operation condition and the cruise control stop condition.
Cruise control operation condition
• When all of the following conditions are met, execution of the cruise control system is enabled (cruise control
standby status).
— Cruise control ON OFF switch: ON
— Vehicle speed: More than 27 km/h {17 mph}
Cruise control stop condition
• When any of the following conditions are met even while in cruise control, the PCM stops the cruise control and
clears the set vehicle speed.
— Ignition switch: OFF
— Cruise control ON OFF switch: OFF
— Cruise control related DTCs (P0564, P0571) detected
• When any of the following conditions are met even while in cruise control, the PCM stops the cruise control
while storing the set vehicle speed.
— Cruise control CANCEL switch: ON
— Neutral switch (MT) or CPP switch (MT): ON
— TR switch (AT) P/N position switch: ON
— Vehicle speed: Less than 22.5 km/h {13.9 mph}
— Brake switch: ON
— The actual vehicle speed is 15 km/h {9.3 mph} or more lower than the set vehicle speed during cruise
control (ascending).
— Condition where actual vehicle speed is 15 km/h {9.3 mph} or more lower than the set vehicle speed
continues for 60 s or more even when the RES/+ switch is on.
STANDBY
ACCELERATION
TAP UP
DECELERATION
ON OFF
RES /+
RESUME
SET
VEHICLE
SPEED
CLEAR
SET/-
CANCEL
VEHICLE
SPEED
0 km/h
{0 mph}
VEHICLE SPEED
SETTING
TAP DOWN
ACTUAL
VEHICLE SPEED
SET
VEHICLE SPEED
ON
OFF
+
RES
SET
-
CANCEL
STANDBY
E5U140ZW5501
CONTROL SYSTEM
01–40–15
01–40
Cruise control function
• The cruise control includes accelerating, coasting, resume, tap-down, tap-up and downshift functions (AT).
Function List
End Of Sie
DRIVE-BY-WIRE RELAY CONTROL OUTLINE [LF]
E5U014000000N61
• Supplies power to the drive-by-wire control.
End Of Sie
DRIVE-BY-WIRE RELAY CONTROL OPERATION [LF]
E5U014000000N62
• When the main relay is on, the drive-by-wire relay also turns on. (See 01–40–11 MAIN RELAY CONTROL
OPERATION [LF].)
End Of Sie
VARIABLE INTAKE AIR CONTROL OUTLINE [LF]
E5U014000000N16
• Energizes the variable intake air solenoid valve according to engine speed for enhanced inertia charging effect.
End Of Sie
VARIABLE INTAKE AIR CONTROL BLOCK DIAGRAM [LF]
E5U014000000N17
End Of Sie
Function
Contents
Accelerating
• When any of the following conditions are met while driving in cruise control and when the RES/+
switch is continuously pressed, the PCM gradually increases the set vehicle speed.
— Except during resume operation
— The RES/+ switch is on one time or more during resume operation.
Coasting
• When the SET/- switch is continuously pressed, the PCM gradually decreases the set vehicle
speed.
Resume
• When the RES/+ switch signal is input to the PCM during regular driving (cruise control is stopped)
and the previously set vehicle speed is stored in the PCM, the PCM sets the set vehicle speed to
the previously set vehicle speed and begins control.
Tap down
• When all of the following conditions are met while driving in cruise control, the PCM decreases the
set vehicle speed by 1.6 km/h {1.0 mph} and controls the throttle valve actuator.
— During cruise control
— RES/+ switch off
— The RES/+ switch switches from off to on
— When actual vehicle speed is lower (set vehicle speed +2.0 km/h {+1.2 mph})
Tap-up
• When all of the following conditions are met, the PCM increases the set vehicle speed by 1.6 km/h
{1.0 mph} and controls the throttle valve actuator so that the vehicle speed is close to the set vehicle
speed.
— During cruise control
— The RES/+ switch switches from off to on
Downshift (AT)
• When the following conditions are met, a downshift signal is sent to the TCM via CAN.
— RES/+ switch on
— Target vehicle acceleration is not reached
CKP SENSOR
PCM
VARIABLE INTAKE AIR
SOLENOID VALVE
TP SENSOR NO.1, NO.2
E5U140ZT5001
CONTROL SYSTEM
01–40–16
VARIABLE INTAKE AIR CONTROL OPERATION [LF]
E5U014000000N18
Operation conditions
• If any of the following conditions are met:
— Engine speed is approx. 4,750 rpm or more
— Engine speed is approx. 3,150 rpm or less and the throttle opening angle is the specified value or more.
(heavy load condition)
When operation conditions are not met
• The PCM energizes the variable intake air solenoid valve, closing the variable intake air shutter valve to
enhance the inertia charging effect in the engine low to middle speeds and low load ranges.
When operation conditions are met
• The PCM blocks energization the variable intake air solenoid valve, opening the variable intake air shutter valve
to enhance the inertia charging effect in the engine high speed and high-load range.
End Of Sie
VARIABLE VALVE TIMING CONTROL OUTLINE [LF]
E5U014000000N22
• Variable valve timing control changes the intake valve timing according to engine operation conditions to
improve engine output, fuel economy, and exhaust emission performance.
End Of Sie
VARIABLE VALVE TIMING CONTROL BLOCK DIAGRAM [LF]
E5U014000000N23
• Based on the signals from the input sensors, the PCM determines the valve timing suitable for the engine
operation conditions, drives the OCV, and switches the hydraulic passages of the variable valve timing actuator
to provide appropriate valve timing.
End Of Sie
VARIABLE VALVE TIMING CONTROL OPERATION [LF]
E5U014000000N63
• The PCM divides the oil control valve OCV drive range into four modes according to engine operation
conditions. The OCV drive current is determined based on the target current calculated in each mode.
Cleaning Mode
Mode execution condition
• When the following condition is met:
— Idle speed control feedback execution condition
Purpose
• Cleaning mode is to remove foreign material in the OCV hydraulic passages.
Operation
• The target current in the cleaning mode is fixed at 100 mA or 1,000 mA. A current of 100 mA and 1,000 mA
flows to the OCV alternately at certain intervals. When 100 mA current is supplied, the OCV opens the
hydraulic passage for the retard chamber and hydraulic pressure from the oil pump is introduced to the retard
chamber. When 1,000 mA current is supplied, the OCV opens the hydraulic passage for the advance chamber
and hydraulic pressure is introduced from the oil pump to the advance chamber. After repeating this operation
several times, foreign material mixed in the OCV is removed and the cleaning mode is completed.
ECT SENSOR
CKP SENSOR
CMP SENSOR
MAF SENSOR
OCV
PCM
TP SENSOR NO.1, NO.2
E5U140ZT5100
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