Mazda CX 7. Manual - part 151

CONTROL SYSTEM [L3 WITH TC]

01-40–45

01-40

CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION[L3 WITH TC]

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Caution

• When replacing the CMP sensor, make sure there is no foreign material on it such as metal 

shavings. If it is installed with foreign material, the sensor output signal will malfunction resulting 
from fluctuation in magnetic flux and cause a deterioration in engine control.

1. Disconnect the negative battery cable.
2. Remove the charge air cooler duct. (See01-13-5 INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH 

TC].)

3. Remove the charge air cooler cover. (See01-13-5 INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH 

TC].)

4. Disconnect the CMP sensor connector.
5. Remove the CMP sensor installation bolt.
6. Remove the CMP sensor from the cylinder head 

cover.

7. Install in the reverse order of removal.

Tightening torque

5.5— 7.5 N·m {57— 76 kgf·cm, 49— 66 in·lbf}

End Of Sie

CAMSHAFT POSITION (CMP) 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.)

Visual Inspection

1. Disconnect the negative battery cable.
2. Remove the CMP sensor. (See01-40-45 CAMSHAFT POSITION (CMP) SENSOR REMOVAL/

INSTALLATION[L3 WITH TC].)

3. Verify that there are no metal shavings on the sensor.

• If the monitor item condition/specification (reference) is not within the specification even though there is no 

malfunction, carry out the “Circuit Open/Short Inspection”.

Voltage Inspection

1. Idle the engine.

Caution

• Water penetrating the connector will cause sensor malfunction. To prevent this, be careful not to 

damage the wiring harnesses or the waterproof connector so as to cause water penetration.

CMP SENSOR

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CONTROL SYSTEM [L3 WITH TC]

01-40–46

2. Measure the output voltage using an 

oscilloscope.

• If not within the specification, replace the 

CMP sensor.

• If the monitor item condition/specification 

(reference) is not within the specification, 
even though the voltage is within the 
specification, carry out the “Circuit Open/
Short Inspection”.

Voltage

*

: Output voltage varies with camshaft rotation.

Circuit Open/Short Inspection

1. Inspect the following wiring harnesses for an open or short circuit. (Continuity check)

Terminal

Voltage (V)

Condition

A

B+

Under any condition

B

Below 1.0

Under any condition

C

4.8 or more

High output*

0.8 or less

Low output*

A

B

CMP SENSOR 

WIRING HARNESS SIDE CONNECTOR

C

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A

B

CMP SENSOR 

WIRING HARNESS SIDE CONNECTOR

C

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FUSE BOX

(MAIN RELAY)

A

E

B

D

FRONT

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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]

01-40–47

01-40

Open circuit

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

— CMP sensor terminal A and main relay terminal E

— CMP sensor terminal B and PCM terminal 2P

— CMP sensor terminal C and PCM terminal 2S

Short circuit

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

— CMP sensor terminal A and body ground

— CMP sensor terminal B and power supply

— CMP sensor terminal C and body ground

— CMP sensor terminal C and power supply

End Of Sie

WM: KNOCK SENSOR

KNOCK SENSOR (KS) REMOVAL/INSTALLATION[L3 WITH TC]

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Caution

• Be careful not to impact the sensor.

• Verify that there is no debris between the sensor and the cylinder block before installing.

1. Disconnect the negative battery cable.
2. Remove the intake manifold. (See01-13-5 INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH TC])
3. Remove the KS attachment bolt to remove the 

KS.

4. Install in the reverse order of removal.

Tightening torque

16— 24 N·m {1.7— 2.4 kgf·m, 12— 17 ft·lbf}

End Of Sie

KNOCK SENSOR (KS) 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.)

Resistance Inspection

1. Turn the ignition switch to the LOCK position.
2. Disconnect the KS connector.
3. Measure the resistance between KS terminals A and B using a tester.

• If not as specified, replace the KS. (See01-40-47 KNOCK SENSOR (KS) REMOVAL/INSTALLATION[L3 

WITH TC].)

• If the KS is normal, but the PID value is out of specification, perform the “Circuit Open/Short Inspection”.

Specification

Approx. 4.87 megohms

VIEW A

A

KS

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CONTROL SYSTEM [L3 WITH TC]

01-40–48

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.

— KS terminal A and PCM terminal 2U

— KS terminal B and PCM terminal 2V

Short circuit

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

— KS terminal A and power supply

— KS terminal A and body ground

— KS terminal B and power supply

— KS terminal B and body ground

End Of Sie

WM: FUEL PRESSURE SENSOR

BAROMETRIC PRESSURE (BARO) 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. (See00-00-3 HOW TO USE THIS MANUAL.)

1. Connect the M-MDS to the DLC-2.
2. Turn the ignition switch to the ON position.
3. Select BARO on the M-MDS.
4. Verify that the BARO PID (pressure) and 

barometric pressure are practically equal.

• If not as verified, replace the PCM. (See01-

40-6 PCM REMOVAL/INSTALLATION[L3 
WITH TC].)

End Of Sie

A

B

KS

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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DLC-2

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