Mazda Mazda6 Workshop Manual Supplement page 130

Terminal Signal
4B Cooling fan control
VAD control*
4C
7
—*
HO2S (Rear) heater
4D
control
EGR valve #1 coil
4E
control
4F Cooling fan control
4G IAC (+)
EGR valve #2 coil
4H
control
4I Starter relay control
4J IAC (–)
EGR valve #3 coil
4K
control
4L Cooling fan control
OCV control*
4M
7
—*
EGR valve #4 coil
4N
control
4O A/C
Fuel pump
10
control*
4P
9
—*
F1–42
CONTROL SYSTEM
Connected to
Cooling fan relay
VAD control
5
solenoid valve
—
HO2S (Rear)
heater
EGR valve
(terminal E)
Cooling fan relay
IAC valve
EGR valve
(terminal A)
Starter relay
(MTX)
TR switch (ATX)
IAC valve
EGR valve
(terminal B)
Cooling fan relay
5
OCV
—
EGR valve
(terminal F)
A/C relay
Fuel pump relay
—
Test condition
ECT below 100
°C {212 °F}
Idling
A/C operating
Engine speed
below 5,800
rpm
Ignition switch
ON
Engine speed
above 5,800
rpm
—
Engine speed
below 4,000
rpm
Ignition switch
ON
Engine speed
above 4,000
rpm
Ignition switch ON
Idle
ECT below 100
°C {212 °F}
A/C operating
Idling
and refrigerant
pressure switch
(middle) ON
• Inspect using the wave profile.
(See F1–44 Inspection Using An
Oscilloscope (Reference).)
Ignition switch ON
Idle
Under any condition
• Inspect using the wave profile.
(See F1–44 Inspection Using An
Oscilloscope (Reference).)
Ignition switch ON
Idle
ECT below 100
°C {212 °F}
Idling
A/C operating
• Inspect using the wave profile.
(See F1–44 Inspection Using An
Oscilloscope (Reference).)
—
Ignition switch ON
Idle
A/C operating
A/C not operating
Ignition switch ON
Cranking
Idle
—
Voltage
Action
(V)
• Inspect cooling fan
B+
relay
• Inspect related
Below 1.0
harness
• Inspect VAD control
B+
solenoid valve
• Inspect related
harness
Below 1.0
— —
• Inspect HO2S (Front)
B+
heater.
• Inspect related
harness
Below 1.0
Below 1.0 • Inspect EGR valve
• Inspect related
Below 1.0
harness
B+
• Inspect cooling fan
relay
• Inspect related
Below 1.0
harness
• Inspect IAC valve
• Inspect related
harness
• Inspect EGR valve
B+
• Inspect related
B+
harness
• Perform "On-Board
Diagnostic Test"
Below 1.0
• Inspect related
harness
• Inspect IAC valve
• Inspect related
harness
• Inspect EGR valve
B+
• Inspect related
B+
harness
• Inspect cooling fan
B+
relay
• Inspect related
Below 1.0
harness
• Inspect OCV valve
• Inspect related
harness
— —
Below 1.0 • Inspect EGR valve
• Inspect related
Below 1.0
harness
Below 1.0 • Inspect A/C relay
• Inspect related
B+
harness
• Inspect fuel pump
B+
relay
Below 1.0
• Inspect related
Below 1.0
harness
— —