Mazda 6. Manual — part 130
CONTROL SYSTEM
F–48–8
4F
Cooling fan control
Cooling fan relay
Idling
ECT below 100
°C {212 °F}
B+
• Inspect cooling fan
relay
• Inspect related
harness
A/C operating
and refrigerant
pressure switch
(middle) ON
Below 1.0
4G
IAC (+)
IAC valve
• Inspect using the wave profile.
(See
• Inspect IAC valve
(See
CONTROL (IAC)
VALVE INSPECTION
)
• Inspect related
harness
4H
EGR valve #2 coil
control
EGR valve
(terminal A)
Ignition switch ON
B+
• Inspect EGR valve
(See
)
• Inspect related
harness
Idle
B+
4I
Starter relay control
Starter relay*
1
TR switch*
2
Under any condition
Below 1.0
• Perform “On-Board
Diagnostic Test”
(See
• Inspect related
harness
4J
IAC (–)
IAC valve
• Inspect using the wave profile.
(See
• Inspect IAC valve
(See
CONTROL (IAC)
VALVE INSPECTION
)
• Inspect related
harness
4K
EGR valve #3 coil
control
EGR valve
(terminal B)
Ignition switch ON
B+
• Inspect EGR valve
(See
)
• Inspect related
harness
Idle
B+
4L
Cooling fan control
Cooling fan relay
Idling
ECT below 100
°C {212 °F}
B+
• Inspect cooling fan
relay
• Inspect related
harness
A/C operating
Below 1.0
4M*
4
OCV control
OCV
• Inspect using the wave profile.
(See
• Inspect OCV valve
(See
CONTROL VALVE
(OCV) INSPECTION
• Inspect related
harness
4N
EGR valve #4 coil
control
EGR valve
(terminal F)
Ignition switch ON
Below 1.0
• Inspect EGR valve
(See
)
• Inspect related
harness
Idle
Below 1.0
4O
A/C
A/C relay
A/C operating
Below 1.0
• Inspect A/C relay
• Inspect related
harness
A/C not operating
B+
4P*
7
Fuel pump control
Fuel pump relay
Ignition switch ON
B+
• Inspect fuel pump
relay
• Inspect related
harness
Cranking
Below 1.0
Idle
Below 1.0
4Q*
6
Fuel pump control
Fuel pump relay
Ignition switch ON
B+
• Inspect fuel pump
relay
• Inspect related
harness
Cranking
Below 1.0
Idle
Below 1.0
Terminal
Signal
Connected to
Test condition
Voltage
(V)
Action
CONTROL SYSTEM
F–48–9
F
4R*
4
VIS control
VIS control
solenoid valve
Engine speed: above 4,500 rpm
B+
• Inspect VIS solenoid
INTAKE-AIR SYSTEM
(VIS) CONTROL
SOLENOID VALVE
INSPECTION (L3)
• Inspect related
harness
Engine speed: below 4,500 rpm
Below 1.0
4S
—
—
—
—
—
4T
Variable tumble
control
Variable tumble
control solenoid
valve
ECT above 63
°C { 145 °F} while
idling.
B+
• Inspect VIS solenoid
TUMBLE CONTROL
SOLENOID VALVE
INSPECTION
)
• Inspect related
harness
ECT below 63
°C {145 °F} and
engine speed below 3,750 rpm
Below 1.0
4U
Purge control
Purge solenoid
valve
• Inspect using the wave profile.
(See
.)
• Inspect purge
solenoid valve
(See
)
• Inspect related
harness
4V*
2
B+
Main relay
Ignition switch OFF
Below 1.0
• Inspect battery
• Inspect related
harness
Ignition switch ON
B+
4W
Fuel injection (#2)
Fuel injector No.2
• Inspect using the wave profile.
(See
.)
• Inspect fuel injector
No.2
(See
)
• Inspect related
harness
4X
GND
GND
Under any condition
Below 1.0
• Inspect related
harness
4Y*
2
Shift solenoid C
control
Shift solenoid C
• Inspect using the wave profile.
(See
.)
• Inspect shift solenoid
C
• Inspect related
harness
4Z
Fuel injection (#1)
Fuel injector No.1
• Inspect using the wave profile.
(See
.)
• Inspect fuel injector
No.1
(See
)
• Inspect related
harness
4AA
Fuel injection (#4)
Fuel injector No.4
• Inspect using the wave profile.
(See
.)
• Inspect fuel injector
No.4
(See
)
• Inspect related
harness
4AB*
2
Shift solenoid A
control
Shift solenoid A
• Inspect using the wave profile.
(See
.)
• Inspect shift solenoid
A
• Inspect related
harness
4AC*
2
Shift solenoid B
control
Shift solenoid B
• Inspect using the wave profile.
(See
.)
• Inspect shift solenoid
B
• Inspect related
harness
Terminal
Signal
Connected to
Test condition
Voltage
(V)
Action
CONTROL SYSTEM
F–48–10
*
1
: MTX models
*
2
: ATX models
*
3
: LF, L8 engine models
*
4
: L3 engine models
*
5
: MTX, without ABS models
*
6
: Immobilizer system equipped
*
7
: Immobilizer system not equipped
Inspection Using An Oscilloscope (Reference)
IGT1, IGT2 control signals
PCM terminals
• IGT1(No.1 and No.4): 1A(+)—1D(–)
• IGT2(No.2 and No.3): 1B(+)—1C(–)
Oscilloscope setting
• 4 V/DIV (Y), 0.01 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
Generator output voltage signal
PCM terminals
• 1AA(+)—2AC(–)
Oscilloscope setting
• 2 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
HO2S (front) signal
PCM terminals
• 1AB(+)—2H(–)
Oscilloscope setting
• 0.1 V/DIV (Y), 400 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (engine speed approx. 650
rpm [MTX], 700 rpm [ATX], no load, P/S off, A/C
off)
4AD
Fuel injection (#3)
Fuel injector No.3
• Inspect using the wave profile.
(See
• Inspect fuel injector
No.3
(See
• Inspect related
harness
Terminal
Signal
Connected to
Test condition
Voltage
(V)
Action
0 V
A6A3940W003
0 V
A6A3940W004
0 V
A6A3940W005
CONTROL SYSTEM
F–48–11
F
Generator field coil control signal
PCM terminals
• 1AD(+)—1C(–)
Oscilloscope setting
• 0.5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
CKP sensor signal
(+)
PCM terminals
• 2D(+)—2H(–)
Oscilloscope setting
• 2 V/DIV (Y), 4 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
(–)
PCM terminals
• 2G(+)—2H(–)
Oscilloscope setting
• 2 V/DIV (Y), 4 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
VSS signal
PCM terminals
• 3C(+)—2AC(–)
Oscilloscope setting
• 1 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
• Drive the vehicle with approx. 10 km/h {6.2 mph}
0 V
A6A3940W006
0 V
A6A3940W007
0 V
A6A3940W008
0 V
A6A3940W011
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