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