Mazda 6. Manual — part 129

CONTROL SYSTEM

F–48–4

1Z

PSP

PSP switch

Idle

Steering wheel
at straight
ahead position

B+

• Inspect PSP switch

(See

F–58 POWER

STEERING
PRESSURE (PSP)
SWITCH
INSPECTION

)

• Inspect power

steering system

• Inspect related

harness

While turning
steering wheel

Below 1.0

1AA

Generator output
voltage

Generator
(terminal P)

• Inspect using the wave profile.

(See

F–48–10 Inspection Using An

Oscilloscope (Reference)

.)

• Inspect generator

• Inspect related

harness

1AB

HO2S (front)

HO2S (front)

• Inspect using the wave profile.

(See

F–48–10 Inspection Using An

Oscilloscope (Reference)

.)

• Inspect HO2S (front)

(See

F–56 HEATED

OXYGEN SENSOR
(HO2S)
INSPECTION

)

• Inspect related

harness

1AC

A/C on signal

Refrigerant
pressure switch

Idle

A/C switch and
fan switch on

Below 1.0

• Inspect refrigerant

pressure switch

• Inspect related

harness

A/C switch off

B+

1AD

Generator field coil
control

Generator
(terminal D)

• Inspect using the wave profile.

(See

F–48–10 Inspection Using An

Oscilloscope (Reference)

.)

• Inspect following

PIDs: IAT, ECT, RPM,
VPWR, ALTT V.

• Inspect generator

• Inspect related

harness

2A

Throttle position

TP sensor

Ignition switch
ON

CTP

0.65—

1.15

• Inspect TP sensor

(See

F–51

THROTTLE
POSITION (TP)
SENSOR
INSPECTION

)

• Inspect related

harness

WOT

4.3—4.8

2B

—

—

—

—

—

2C

—

—

—

—

—

2D

CKP (+)

CKP sensor

• Inspect using the wave profile.

(See

F–48–10 Inspection Using An

Oscilloscope (Reference)

.)

• Inspect CKP sensor

(See

F–54

CRANKSHAFT
POSITION (CKP)
SENSOR
INSPECTION

)

• Inspect related

harness

2E

IAT

MAF/IAT sensor

Ignition switch
ON

IAT 20

°C

{68

°F}

2.4—2.6

• Inspect IAT sensor

(See

F–50 INTAKE

AIR TEMPERATURE
(IAT) SENSOR
INSPECTION

)

• Inspect related

harness

IAT 30

°C

{86

°F}

1.7—1.9

2F

—

—

—

—

—

2G

CKP (–)

CKP sensor

• Inspect using the wave profile.

(See

F–48–10 Inspection Using An

Oscilloscope (Reference)

.)

• Inspect CKP sensor

(See

F–54

CRANKSHAFT
POSITION (CKP)
SENSOR
INSPECTION

)

• Inspect related

harness

Terminal

Signal

Connected to

Test condition

Voltage

(V)

Action

CONTROL SYSTEM

F–48–5

F

2H

Sensor GND

MAF/IAT sensor,
HO2S (Front,
Rear),
ECT sensor,
TP sensor,
MAP sensor, TFT
sensor, TR switch

Under any condition

Below 1.0

• Inspect related

harness

2I*

5

VSS (–)

VSS

• Inspect using the wave profile.

(See

F–48–10 Inspection Using An

Oscilloscope (Reference)

.)

• Inspect VSS sensor

(See

J–5 VEHICLE

SPEEDOMETER
SENSOR
INSPECTION

)

• Inspect related

harness

2J

CMP (+)

CMP sensor

• Inspect using the wave profile.

(See

F–48–10 Inspection Using An

Oscilloscope (Reference)

.)

• Inspect CMP sensor

(See

F–55

CAMSHAFT
POSITION (CMP)
SENSOR
INSPECTION

)

• Inspect related

harness

2K

Constant voltage
(Vref)

MAP sensor, TP
sensor

Ignition switch ON

Approx.

5.0

• Inspect related

harness

2L*

5

VSS (+)

VSS

• Inspect using the wave profile.

(See

F–48–10 Inspection Using An

Oscilloscope (Reference)

.)

• Inspect VSS sensor

(See

J–5 VEHICLE

SPEEDOMETER
SENSOR
INSPECTION

)

• Inspect related

harness

2M

CMP (–)

CMP sensor

• Inspect using the wave profile.

(See

F–48–10 Inspection Using An

Oscilloscope (Reference)

.)

• Inspect CMP sensor

(See

F–55

CAMSHAFT
POSITION (CMP)
SENSOR
INSPECTION

)

• Inspect related

harness

2N

—

—

—

—

—

2O

—

—

—

—

—

2P

Knocking (–)

Knock sensor

Ignition switch ON (Use digital
type voltmeter, because
measurement voltage will be
detected less than true voltage
when using analog type
voltmeter)

Below 1.0

• Perform “On-Board

Diagnostic Test”
(See

F–62

ON-BOARD
DIAGNOSTIC TEST

)

• Inspect related

harness

2Q*

6

Coil (Immobilizer
system)

Coil

Because this terminal is for communication,
good/no good judgment by terminal voltage
is not possible.

• Inspect coil

• Inspect related

harness

2R

CAN (–)

Instrument cluster,
ABS HU/CM,
ABS/TCS HU/CM,
DSC HU/CM

Because this terminal is for CAN, good/no
good judgment by terminal voltage is not
possible.

• Inspect related

harness

2S

Knocking (+)

Knock sensor

Ignition switch ON (Use digital
type voltmeter, because
measurement voltage will be
detected less than true voltage
when using analog type
voltmeter)

Approx.

4.3

• Perform “On-Board

Diagnostic Test”
(See

F–62

ON-BOARD
DIAGNOSTIC TEST

)

• Inspect related

harness

2T*

6

Coil (Immobilizer
system)

Coil

Because this terminal is for communication,
good/no good judgment by terminal voltage
is not possible.

• Inspect coil

• Inspect related

harness

Terminal

Signal

Connected to

Test condition

Voltage

(V)

Action

CONTROL SYSTEM

F–48–6

2U

CAN (+)

Instrument cluster,
ABS HU/CM,
ABS/TCS HU/CM,
DSC HU/CM

Because this terminal is for CAN, good/no
good judgment by terminal voltage is not
possible.

• Inspect related

harness

2V

—

—

—

—

—

2W

Security light
control

Instrument cluster
(Security light)

Security light illuminate

Below 1.0

• Inspect related

harness

Others

B+

2X

Main relay control

Main relay

Ignition switch OFF

B+

• Inspect main relay

(See

T–24 RELAY

INSPECTION

)

• Inspect related

harness

Ignition switch ON

Below 1.0

2Y

B+

Main relay

Ignition switch OFF

Below 1.0

• Inspect battery

• Inspect related

harness

Ignition switch ON

B+

2Z

Back-up power
supply

Battery (positive
terminal)

Under any condition

B+

• Inspect battery

• Inspect related

harness

2AA

—

—

—

—

—

2AB

GND

GND

Under any condition

Below 1.0

• Inspect related

harness

2AC

GND

GND

Under any condition

Below 1.0

• Inspect related

harness

2AD

—

—

—

—

—

3A

—

—

—

—

—

3B

—

—

—

—

—

3C*

2

Vehicle speed

VSS (ATX)

• Inspect using the wave profile.

(See

F–48–10 Inspection Using An

Oscilloscope (Reference)

.)

• Inspect VSS

• Inspect related

harness

3D*

2

ATF temperature

TFT sensor

Ignition switch
ON

TFT 20

°C

{68

°F}

Approx.

3.3

• Inspect TFT sensor

• Inspect related

harness

TFT 40

°C

{104

°F}

Approx.

2.4

TFT 60

°C

{140

°F}

Approx.

1.5

3E

—

—

—

—

—

3F

—

—

—

—

—

3G*

2

Input/turbine speed
sensor (+)

Input/turbine
speed sensor

• Inspect using the wave profile.

(See

F–48–10 Inspection Using An

Oscilloscope (Reference)

.)

• Inspect input/turbine

speed sensor

• Inspect related

harness

3H

—

—

—

—

—

3I

—

—

—

—

—

3J*

2

Input/turbine speed
sensor (–)

Input/turbine
speed sensor

• Inspect using the wave profile.

(See

F–48–10 Inspection Using An

Oscilloscope (Reference)

.)

• Inspect input/turbine

speed sensor

• Inspect related

harness

3K*

2, 4

Manual down

Down switch

Ignition switch
ON

Detects down-
shift operation
of selector lever
in M range

Below 1.0

• Inspect down switch

• Inspect related

harness

Others

B+

3L

—

—

—

—

—

3M

—

—

—

—

—

3N*

2, 4

Manual up

Up switch

Ignition switch
ON

Detects up-shift
operation of
selector lever in
M range

Below 1.0

• Inspect up switch

• Inspect related

harness

Others

B+

3O

—

—

—

—

—

Terminal

Signal

Connected to

Test condition

Voltage

(V)

Action

CONTROL SYSTEM

F–48–7

F

3P*

2

Shift solenoid E
control

Shift solenoid E

Detects TCC operation

B+

• Inspect shift solenoid

E

• Inspect related

harness

Others

Below 1.0

3Q*

2

HOLD*

3

HOLD switch

Ignition switch
ON

HOLD switch
pushed

Below 1.0

• Inspect HOLD switch

• Inspect related

harness

Others

B+

M range*

4

M range switch

Ignition switch
ON

Manual mode

Below 1.0

• Inspect M range

switch

• Inspect related

harness

Others

B+

3R

—

—

—

—

—

3S*

2

Shift solenoid D
control

Shift solenoid D

Selector lever is at P, N position

B+

• Inspect shift solenoid

D

• Inspect related

harness

Others

Below 1.0

3T*

2

Oil pressure

Oil pressure
switch

Ignition switch
ON

Detects forward
clutch pressure

Below 1.0

• Inspect oil pressure

switch

• Inspect related

harness

Others

B+

3U

—

—

—

—

—

3V*

2

Pressure control
solenoid (–)

Pressure control
solenoid valve

• Inspect using the wave profile.

(See

F–48–10 Inspection Using An

Oscilloscope (Reference)

.)

• Inspect pressure

control solenoid valve

• Inspect related

harness

3W

—

—

—

—

—

3X

—

—

—

—

—

3Y*

2

Pressure control
solenoid (+)

Pressure control
solenoid valve

• Inspect using the wave profile.

(See

F–48–10 Inspection Using An

Oscilloscope (Reference)

.)

• Inspect pressure

control solenoid valve

• Inspect related

harness

3Z

—

—

—

—

—

3AA

—

—

—

—

—

4A

HO2S (Front)
heater control

HO2S (Front)
heater

• Inspect using the wave profile.

(See

F–48–10 Inspection Using An

Oscilloscope (Reference)

.)

• Inspect HO2S (Front)

heater.
(See

F–56 HEATED

OXYGEN SENSOR
(HO2S)
INSPECTION

)

• Inspect related

harness

4B

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

4C*

4

VAD control

VAD control
solenoid valve

Ignition switch
ON

Engine speed
below 5,800
rpm

B+

• Inspect VAD control

solenoid valve

• Inspect related

harness

Engine speed
above 5,800
rpm

Below 1.0

4D

HO2S (Rear) heater
control

HO2S (Rear)
heater

Ignition switch
ON

Engine speed
below 4,000
rpm

B+

• Inspect HO2S (Front)

heater.
(See

F–56 HEATED

OXYGEN SENSOR
(HO2S)
INSPECTION

)

• Inspect related

harness

Engine speed
above 4,000
rpm

Below 1.0

4E

EGR valve #1 coil
control

EGR valve
(terminal E)

Ignition switch ON

Below 1.0

• Inspect EGR valve

(See

F–40 EGR

VALVE INSPECTION

)

• Inspect related

harness

Idle

Below 1.0

Terminal

Signal

Connected to

Test condition

Voltage

(V)

Action