Mazda CX 7. Manual - part 142

CONTROL SYSTEM [L3 WITH TC]

01-40–9

01-40

1AO

— — 

— 

— 

— 

1AP

— — 

— 

— 

— 

1AQ

Cruise control 
switch

Cruise control 
switch

Ignition switch 
to the ON 
position

ON/OFF switch 
pressed in

Approx. 0

• Cruise control switch

• Related wiring 

harness

CANCEL switch 
pressed in

Approx. 

1.1

SET/COAST 
switch pressed 
in

Approx. 

3.1

RES/ACCEL 
switch pressed 
in

Approx. 

4.2

Except above

Approx. 

5.0

1AR

IAT sensor ground

MAF/IAT sensor

Under any condition

Below 1.0

• Related wiring 

harness

1AS

EVAP leak 
detection pump 
(pump)

EVAP leak 
detection pump

Ignition switch to the ON position

Below 1.0

• EVAP leak detection 

pump

• Related wiring 

harness

Idling

B+

1AT

Main relay control

Main relay

Ignition switch off after 10 s

B+

• Main relay

• Related wiring 

harness

Ignition switch to the ON position

Below 1.0

1AU

A/C on signal

Refrigerant 
pressure switch 
(high, low)

Idle

A/C switch and 
fan switch on

B+

• Refrigerant pressure 

switch (high, low)

• Related wiring 

harness

1AV

APP sensor ground APP sensor

Under any condition

Below 1.0

• Related wiring 

harness

1AW

Injector control

Fuel Injector relay

Under any condition

Below 1.0

• Related wiring 

harness

1AX

Drive-by-wire relay

Drive-by-wire relay

Ignition switch off after 10 s

B+

• Related wiring 

harness

Ignition switch to the ON position

Below 1.0

1AY

Ignition switch

Ignition switch

Ignition switch off

Below 1.0

• Related wiring 

harness

Ignition switch to the ON position

B+

1AZ

Ground

Ground

Under any condition

Below 1.0

• Related wiring 

harness

1BA

Back-up power 
supply

Battery (positive 
terminal)

Under any condition

B+

• Battery

• Related wiring 

harness

1BB

Ground

Ground

Under any condition

Below 1.0

• Related wiring 

harness

1BC

Sensor ground

HO2S (rear)

Under any condition

Below 1.0

• HO2S (rear)

• Related wiring 

harness

1BD

Ground

Ground

Under any condition

Below 1.0

• Related wiring 

harness

1BE

B+

Main relay

Ignition switch off after 10 s

Below 1.0

• Battery

• Related wiring 

harness

Ignition switch to the ON position

B+

1BF

Drive-by-wire relay

Drive-by-wire relay

Ignition switch off after 10 s

Below 1.0

• Related wiring 

harness

Ignition switch to the ON position

B+

1BG

Ground

Ground

Under any condition

Below 1.0

• Related wiring 

harness

1BH

Ground

Ground

Under any condition

Below 1.0

• Related wiring 

harness

2A

Throttle actuator 
control (+)

Throttle body

Ignition switch off

Approx. 

1.5

• Throttle actuator

• Related wiring 

harness

Ignition switch to the ON position

B+

Terminal

Signal

Connected to

Test condition

Voltage 

(V)

Inspection item

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CONTROL SYSTEM [L3 WITH TC]

01-40–10

2B

Throttle actuator 
control (–)

Throttle body

Ignition switch off

Approx. 

1.5

• Throttle actuator

• Related wiring 

harness

Ignition switch to the ON position

B+

2C

HO2S (front) heater 
control

HO2S (front) 
heater

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• HO2S (front)

• Related wiring 

harness

2D

HO2S (rear) heater 
control

HO2S (rear) 
heater

• Engine speed above 5,000 

rpm (Heater control not 
operating) 

B+

• HO2S (rear) heater

• Related wiring 

harness

2E

Variable swirl 
solenoid valve 
power supply

Main relay, 
variable swirl 
solenoid valve, 
CMP sensor

Ignition switch off after 10 s

Below 1.0

• Main relay

• Related wiring 

harness

Ignition switch to the ON position

B+

2F

High pressure fuel 
pump control (+)

High pressure fuel 
pump

Ignition switch off

Below 1.0

• High pressure fuel 

pump

• Related wiring 

harness Related 
wiring harness

Ignition switch to the ON position

Approx. 

9.7

Idle

Approx. 

9.4

2G

High pressure fuel 
pump control (–)

High pressure fuel 
pump

Ignition switch off

Below 1.0

• High pressure fuel 

pump

• Related wiring 

harness Related 
wiring harness

Ignition switch to the ON position

Approx. 

9.6

Idle

Approx. 

8.6

2H

Ground

Body ground

Under any condition

Below 1.0

• Related wiring 

harness

2I

Constant voltage 
(Vref)

Fuel pressure 
sensor

Ignition switch to the ON position

Approx. 

5.0

• Related wiring 

harness

2J

— — 

— 

— 

— 

2K

— — 

— 

— 

— 

2L

— — 

— 

— 

— 

2M

Sensor ground

HO2S (front)

Under any condition

Below 1.0

• Related wiring 

harness

2N

Boost air 
temperature

MAP/Boost air 
temperature 
sensor

Ignition switch 
to the ON 
position

IAT 20 

°C

{68 

°F}

2.4—2.6

• Boost air temperature 

sensor

• Related wiring 

harness

IAT 30 

°C

{86 

°F}

1.7—1.9

2O

— — 

— 

— 

— 

2P

Sensor ground

Fuel pressure 
sensor

Under any condition

Below 1.0

• Fuel pressure sensor

• Related wiring 

harness

2Q

HO2S (rear)

HO2S (rear)

Idle

0—1

• HO2S (rear)

• Related wiring 

harness

2R

Fuel pressure 
sensor

Fuel pressure 
sensor

Ignition switch off

Below 1.0

• Fuel pressure sensor

• Related wiring 

harness

Ignition switch to the ON position

Approx. 

1.1

Idle

Approx. 

1.7

2S

CMP

CMP sensor

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• CMP sensor

• Related wiring 

harness

2T

PSP

PSP switch

Idle

Steering wheel 
at straight 
ahead position

B+

• PSP switch

• Power steering 

system

• Related wiring 

harness

While turning 
steering wheel

Below 1.0

Terminal

Signal

Connected to

Test condition

Voltage 

(V)

Inspection item

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CONTROL SYSTEM [L3 WITH TC]

01-40–11

01-40

2U

Knocking (+)

KS

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

Approx. 

4.3

• KS

• Related wiring 

harness

2V

Knocking (–)

KS

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

Below 1.0

• KS

• Related wiring 

harness

2W

CKP

CKP sensor

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• CKP sensor

• Related wiring 

harness

2X

Internal ground

KS, CMP sensor, 
CKP sensor, 
HO2S (Front), 
Variable swirl 
solenoid valve, TP 
sensor

Under any condition

Below 1.0

• Related wiring 

harness

2Y

HO2S (front) 
calibration resistor

HO2S (front)

Ignition switch off after 10s

Below 1.0

• HO2S (front)

• Related wiring 

harness

Ignition switch to the ON position

Approx. 

3.9

2Z

HO2S (front) power 
supply

HO2S (front)

Idle (after warm up)

Approx. 

6.2

• HO2S (front)

• Related wiring 

harness

2AA

Wastegate control 
solenoid valve

Wastegate control 
solenoid valve

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• Wastegate control 

solenoid valve

• Related wiring 

harness

2AB

Purge solenoid 
valve

Purge solenoid 
valve

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• Purge solenoid valve

• Related wiring 

harness

2AC

HO2S (front) VSIP

HO2S (front)

Idle (after warm up)

Approx. 

3.7

• HO2S (front)

• Related wiring 

harness

2AD

HO2S (front) IP+

HO2S (front)

Idle (after warm up)

Approx. 

3.7

• HO2S (front)

• Related wiring 

harness

After racing

2.1—4.8

2AE

Variable swirl 
shutter valve 
monitor

Variable swirl 
shutter valve 
switch

variable swirl shutter valve close

Below 1.0

• Variable swirl shutter 

valve switch

• Related wiring 

harness

variable swirl shutter valve open

B+

2AF

OCV control

OCV

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• OCV valve

• Related wiring 

harness

2AG

Manifold absolute 
pressure

MAP sensor

Ignition switch to the ON position)

Approx. 

1.9

• MAP sensor

• Related wiring 

harness

Idle (after warm up)

Below 1.0

2AH

ECT

ECT sensor

Ignition switch 
to the ON 
position

ECT 20 

°C

{68 

°F}

3.04—

3.14

• ECT sensor

• Related wiring 

harness

ECT 60 

°C

{140 

°F}

1.29—

1.39

2AI

Generator field coil 
control

Generator
(terminal D)

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• Generator

• Related wiring 

harness

2AJ

Generator output 
voltage

Generator
(terminal P)

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• Generator

• Related wiring 

harness

Terminal

Signal

Connected to

Test condition

Voltage 

(V)

Inspection item

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CONTROL SYSTEM [L3 WITH TC]

01-40–12

2AK

TP sensor (No. 1)

TP sensor (No. 1)

Ignition switch 
to the ON 
position

APP is released

0.4—0.6

• TP sensor

• Related wiring 

harness

APP is 
depressed

4.7—4.9

2AL

TP sensor (No. 2)

TP sensor (No. 2)

Ignition switch 
to the ON 
position

APP is released

4.4—4.6

• TP sensor

• Related wiring 

harness

APP is 
depressed

0.1—0.3

2AM

EGR valve #3 coil 
control

EGR valve
(terminal A)

Ignition switch to the ON position

B+

• EGR valve

• Related wiring 

harness

Ignition switch off

Below 1.0

2AN

EGR valve #6 coil 
control

EGR valve
(terminal F)

Ignition switch to the ON position

B+

• EGR valve

• Related wiring 

harness

Idle

B+

2AO

Constant voltage 
(Vref)

TP sensor

Ignition switch to the ON position

Approx. 

5.0

• TP sensor

• Related wiring 

harness

2AP

TP sensor Ground

TP sensor

Under any condition

Below 1.0

• TP sensor

• Related wiring 

harness

2AQ

EGR valve #1 coil 
control

EGR valve
(terminal E)

Ignition switch to the ON position

Below 1.0

• EGR valve

• Related wiring 

harness

Idle

Below 1.0

2AR

EGR valve #4 coil 
control

EGR valve
(terminal B)

Ignition switch to the ON position

B+

• EGR valve

• Related wiring 

harness

Ignition switch off 

Below 1.0

2AS

Variable swirl 
control

Variable swirl 
solenoid valve

ECT 62 

°C {144 °F} or more and 

engine speed 3,250 rpm or more 

B+

• Variable swirl 

solenoid valve

• Related wiring 

harness

ECT less than 62 

°C {144 °F} and 

engine speed less than3,250 rpm 

Below 1.0

2AT

IGT4

Ignition coil (No.4 
cylinders)

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• Ignition coil No.4

• Related wiring 

harness

2AU

Constant voltage 
(Vref)

MAP sensor

Ignition switch to the ON position

Approx. 

5.0

• Related wiring 

harness

2AV

Sensor ground

MAP sensor

Under any condition

Below 1.0

• Related wiring 

harness

2AW

IGT2

Ignition coil (No.2 
cylinders)

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• Ignition coil No.2

• Related wiring 

harness

2AX

IGT3

Ignition coil (No.3 
cylinders)

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• Ignition coil No.3

• Related wiring 

harness

2AY

Sensor ground

ECT sensor

Under any condition

Below 1.0

• ECT sensor

• Related wiring 

harness

2AZ

Fuel injection
(–)(#4)

Fuel injector 
(No.4)

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• Fuel injector No.4

• Related wiring 

harness

2BA

IGT1

Ignition coil (No.1 
cylinders)

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• Ignition coil No.1

• Related wiring 

harness

2BB

Fuel injection
(–)(#1)

Fuel injector 
(No.1)

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• Fuel injector No.1

• Related wiring 

harness

2BC

Fuel injection
(–)(#2)

Fuel injector 
(No.2)

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• Fuel injector No.2

• Related wiring 

harness

2BD

Fuel injection
(–)(#3)

Fuel injector 
(No.3)

• Inspect using the wave profile.

(See01-40-6 PCM inspection 
preparation.)

• Fuel injector No.3

• Related wiring 

harness

2BE

Fuel injector power 
supply 1

Fuel Injector relay

Ignition switch off

Below 1.0

• Fuel Injector relay

• Related wiring 

harness

Ignition switch to the ON position

B+

Terminal

Signal

Connected to

Test condition

Voltage 

(V)

Inspection item

1871-1U-06B(01-40).fm  12 ページ  ２００６年３月１５日　水曜日　午前１０時５３分