Mazda CX 7. Manual - part 148

CONTROL SYSTEM [L3 WITH TC]

01-40–33

01-40

Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH TC].)
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity check)

Open circuit

• If there is no continuity, there is an open circuit. Repair or replace the wiring harness.

— Throttle body terminal A and PCM terminal 2AK

— Throttle body terminal B and PCM terminal 2AO

— Throttle body terminal C and PCM terminal 2AL

— Throttle body terminal D and PCM terminal 2AP

Short circuit

• If there is continuity, there is a short circuit. Repair or replace the wiring harness.

— Throttle body terminal A and power supply

— Throttle body terminal A and body ground

— Throttle body terminal B and body ground

— Throttle body terminal C and power supply

— Throttle body terminal C and body ground

— Throttle body terminal D and power supply

End Of Sie

WM: ACCELERATOR PEDAL POSITION SENSOR

ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION[L3 WITH TC]

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Note

• Before performing the following inspection, make sure to follow the procedure as indicated in the 

troubleshooting flowchart. (See 00-00-3 HOW TO USE THIS MANUAL.)

Voltage Inspection

1. Turn the ignition switch to the ON position (Engine off).
2. Verify that the PCM terminal 1Y and 1AC change smoothly while throttle valve is gradually opened.

• If as verified, go to next step.

• If not as verified, perform the “Circuit Open/Short Inspection”.

— If there is no open or short circuit, replace the throttle body. (See01-13-5 INTAKE AIR SYSTEM 

REMOVAL/INSTALLATION[L3 WITH TC].)

A

B

C

D

E

F

TP SENSOR 

WIRING HARNESS SIDE CONNECTOR

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2BE 2BA 2AW 2AS 2AO 2AK 2AG 2AC 2Y 2U 2Q 2M

2E

2A

2I

2BH 2BD 2AZ 2AV 2AR 2AN 2AJ 2AF 2AB 2X 2T 2P

2H

2D

2L

2BG 2BC 2AY 2AU 2AQ 2AM 2AI 2AE 2AA 2W 2S 2O

2G

2C

2K

2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z

2V 2R 2N

2F

2B

2J

1BE 1BA 1AW 1AS 1AO 1AK 1AG 1AC 1Y 1U 1Q 1M

1E

1A

1I

1BH 1BD 1AZ 1AV 1AR 1AN 1AJ 1AF 1AB 1X

1T

1P

1H

1D

1L

1BG 1BC 1AY 1AU 1AQ 1AM 1AI 1AE 1AA 1W 1S 1O

1G

1C

1K

1BF 1BB 1AX 1AT 1AP 1AL 1AH 1AD 1Z

1V

1R 1N

1F

1B

1J

PCM

WIRING HARNESS-SIDE CONNECTOR

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CONTROL SYSTEM [L3 WITH TC]

01-40–34

3. Verify that the PCM terminal 1Y and 1AC voltages are as shown in the following table.

• If the voltage is not according to the following table, perform the “Circuit Open/Short Inspection”.

— If there is no open or short circuit, replace accelerator pedal. (See01-13-17 ACCELERATOR PEDAL 

REMOVAL/INSTALLATION[L3 WITH TC].)

APP sensor output voltage

Circuit Open/Short Inspection

2BE 2BA 2AW 2AS 2AO 2AK 2AG 2AC 2Y 2U 2Q 2M

2E

2A

2I

2BH 2BD 2AZ 2AV 2AR 2AN 2AJ 2AF 2AB 2X 2T 2P

2H

2D

2L

2BG 2BC 2AY 2AU 2AQ 2AM 2AI 2AE 2AA 2W 2S 2O

2G

2C

2K

2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z

2V 2R 2N

2F

2B

2J

1BE 1BA 1AW 1AS 1AO 1AK 1AG 1AC 1Y 1U 1Q 1M

1E

1A

1I

1BH 1BD 1AZ 1AV 1AR 1AN 1AJ 1AF 1AB 1X

1T

1P

1H

1D

1L

1BG 1BC 1AY 1AU 1AQ 1AM 1AI 1AE 1AA 1W 1S 1O

1G

1C

1K

1BF 1BB 1AX 1AT 1AP 1AL 1AH 1AD 1Z

1V

1R 1N

1F

1B

1J

PCM

WIRING HARNESS-SIDE CONNECTOR

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Condition

PCM terminal 1Y

(APP sensor 

No.1)

PCM terminal 

1AC

(APP sensor 

No.2)

APP is depressed

3.65— 3.93 V

3.10— 3.38

APP is released

1.56— 1.65V

1.01— 1.10

LOW

HIGH

OUTPUT
VOLTAGE

SMALL

APP SENSOR No.2

APP SENSOR No.1

LARGE

THROTTLE

OPENING ANGLE

THE CHARACTERISTICS OF 
TP SENSOR (REFERENCE)

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APP SENSOR

WIRING HARNESS SIDE CONNECTOR

A

B

C

D

E

F

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2BE 2BA 2AW 2AS 2AO 2AK 2AG 2AC 2Y 2U 2Q 2M

2E

2A

2I

2BH 2BD 2AZ 2AV 2AR 2AN 2AJ 2AF 2AB 2X 2T 2P

2H

2D

2L

2BG 2BC 2AY 2AU 2AQ 2AM 2AI 2AE 2AA 2W 2S 2O

2G

2C

2K

2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z

2V 2R 2N

2F

2B

2J

1BE 1BA 1AW 1AS 1AO 1AK 1AG 1AC 1Y 1U 1Q 1M

1E

1A

1I

1BH 1BD 1AZ 1AV 1AR 1AN 1AJ 1AF 1AB 1X

1T

1P

1H

1D

1L

1BG 1BC 1AY 1AU 1AQ 1AM 1AI 1AE 1AA 1W 1S 1O

1G

1C

1K

1BF 1BB 1AX 1AT 1AP 1AL 1AH 1AD 1Z

1V

1R 1N

1F

1B

1J

PCM

WIRING HARNESS-SIDE CONNECTOR

acxuuw00000119

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CONTROL SYSTEM [L3 WITH TC]

01-40–35

01-40

1. Disconnect the PCM connector. (See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH TC].)
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity check)

Open circuit

• If there is no continuity, there is an open circuit. Repair or replace the wiring harness.

— APP sensor terminal A and PCM terminal 1AJ

— APP sensor terminal B and PCM terminal 1AV

— APP sensor terminal C and PCM terminal 1AC

— APP sensor terminal D and PCM terminal 1Q

— APP sensor terminal E and PCM terminal 1U

— APP sensor terminal F and PCM terminal 1Y

Short circuit

• If there is continuity, there is a short circuit. Repair or replace the wiring harness.

— APP sensor terminal A and body ground

— APP sensor terminal B and power supply

— APP sensor terminal C and power supply

— APP sensor terminal C and body ground

— APP sensor terminal D and body ground

— APP sensor terminal E and power supply

— APP sensor terminal F and power supply

— APP sensor terminal F and body ground

End Of Sie

WM: FUEL PRESSURE SENSOR

FUEL PRESSURE SENSOR REMOVAL/INSTALLATION[L3 WITH TC]

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Note

• If the fuel pressure sensor is removed, do not reuse the fuel pressure sensor and the fuel delivery pipe. 

When you replace the fuel pressure sensor, replace a new fuel delivery pipe with a new fuel pressure 
sensor.  (See 01-14-23 FUEL INJECTOR REMOVAL/INSTALLATION[L3 WITH TC])

End Of Sie

FUEL PRESSURE SENSOR INSPECTION[L3 WITH TC]

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Note

• Before performing the following inspection, make sure to follow the procedure as indicated in the 

troubleshooting flowchart. (See 00-00-3 HOW TO USE THIS MANUAL.)

1. Connect the M-MDS to the DLC-2.
2. Turn the ignition switch to the ON position (Engine 

off).

3. Select the FUEL_PRES PID on the M-MDS.
4. After warming up the engine, verify that the 

FUEL_PRES PID is at the standard value under 
the following conditions.

— If not as verified, replace the fuel delivery 

pipe.

5. After connecting the spill valve control solenoid valve connector, clear the DTC.

Step

Condition

FUEL_PRES PID

1

• Idle

• 90 s after engine is 

started

Approx. 3 MPa

2

• Idle

• Spill valve solenoid 

valve connector is 
disconnected

Approx. 530 kPa

DLC-2

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CONTROL SYSTEM [L3 WITH TC]

01-40–36

Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH TC].)
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity check)

Open circuit

• If there is no continuity, there is an open circuit. Repair or replace the wiring harness.

— Fuel pressure sensor terminal A and PCM terminal 2P

— Fuel pressure sensor terminal B and PCM terminal 2R

— Fuel pressure sensor terminal C and PCM terminal 2I

Short circuit

• If there is continuity, there is a short circuit. Repair or replace the wiring harness.

— Fuel pressure sensor terminal A and power supply.

— Fuel pressure sensor terminal B and power supply.

— Fuel pressure sensor terminal B and body ground.

— Fuel pressure sensor terminal C and body ground

End Of Sie

WM: HEATED OXYGEN SENSOR

FUEL PRESSURE SENSOR

WIRING HARNESS SIDE CONNECTOR

A

B

C

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2BE 2BA 2AW 2AS 2AO 2AK 2AG 2AC 2Y 2U 2Q 2M

2E

2A

2I

2BH 2BD 2AZ 2AV 2AR 2AN 2AJ 2AF 2AB 2X 2T 2P

2H

2D

2L

2BG 2BC 2AY 2AU 2AQ 2AM 2AI 2AE 2AA 2W 2S 2O

2G

2C

2K

2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z

2V 2R 2N

2F

2B

2J

1BE 1BA 1AW 1AS 1AO 1AK 1AG 1AC 1Y 1U 1Q 1M

1E

1A

1I

1BH 1BD 1AZ 1AV 1AR 1AN 1AJ 1AF 1AB 1X

1T

1P

1H

1D

1L

1BG 1BC 1AY 1AU 1AQ 1AM 1AI 1AE 1AA 1W 1S 1O

1G

1C

1K

1BF 1BB 1AX 1AT 1AP 1AL 1AH 1AD 1Z

1V

1R 1N

1F

1B

1J

PCM

WIRING HARNESS-SIDE CONNECTOR

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