Mazda CX 7. Manual - part 43

 

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Mazda CX 7. Manual - part 43

 

 

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–127

01-02

Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS BEEN 
RECORDED

• Has the FREEZE FRAME DATA been 

recorded?

Yes

Go to the next step.

No

Record FREEZE FRAME DATA on the repair order, then go 
to the next step.

2

VERIFY RELATED REPAIR INFORMATION 
AVAILABILITY

• Check for related Service Bulletins and/or on-

line repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available the 
repair information.

• If the vehicle is not repaired, go to the next step.

No

Go to the next step.

3

VERIFY CKP SENSOR VOLTAGE

• Disconnect the CKP sensor connector.

• Connect the voltmeter between the CKP 

sensor connector terminals B and C (sensor-
side).

• Inspect the voltage in the AC range while 

cranking the engine.

• Is there any voltage?

Yes

Go to the next step.

No

Go to step 10.

4

INSPECT CKP SENSOR CONNECTOR FOR 
POOR CONNECTION

• Verify that the CKP sensor connector is 

connected securely.

• Is connector normal?

Yes

Go to the next step.

No

Reconnect the connector, then go to Step 11.

5

INSPECT CKP CIRCUIT FOR SHORT TO 
POWER SUPPLY

• Turn ignition switch OFF

• Disconnect the CKP sensor connector.

• Turn ignition switch to the ON position (Engine 

off).

• Measure the voltage between following 

terminals (harness-side):

— CKP sensor terminal A

— CKP sensor terminal B

• Is there any voltage?

Yes

Repair or replace the suspected wiring harness, then go to 
Step 11.

No

Go to the next step.

6

INSPECT CKP CIRCUIT FOR SHORT TO 
GROUND

• Inspect for continuity between following 

terminal and body ground:
— CKP sensor connector terminal C (harness-

side)

— CKP sensor connector terminal B (harness-

side)

• Is there continuity?

Yes

Repair or replace the suspected wiring harness, then go to 
Step 11.

No

Go to the next step.

7

INSPECT CKP CIRCUITS FOR SHORT CIRCUIT

• Inspect for continuity between CKP sensor 

connector terminals B and C (harness-side).

• Is there continuity?

Yes

Repair or replace the suspected wiring harness, then go to 
Step 11.

No

Go to the next step.

8

INSPECT PCM CONNECTOR FOR POOR 
CONNECTION

• Disconnect the PCM connector.

• Inspect for poor connection (such as damaged/

pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair the terminal, then go to Step 11.

No

Go to the next step.

9

INSPECT CKP CIRCUIT FOR OPEN CIRCUIT

• Inspect for continuity between the following 

circuits:

— CKP sensor terminal A (harness-side) and 

PCM terminal 2P (harness-side)

— CKP sensor terminal B (harness-side) and 

PCM terminal 2W (harness-side)

— CKP sensor terminal C (harness-side) and 

main relay

• Are there continuity?

Yes

Go to Step 11.

No

Repair or replace the suspected wiring harness, then go to 
Step 11.

1871-1U-06B(01-02).fm  127 ページ  2006年3月15日 水曜日 午前10時32分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–128

End Of Sie

DTC P0340[L3 WITH TC]

id010239807000

10

INSPECT CKP SENSOR

• Turn the ignition switch off.

• Perform the CKP sensor inspection.

 (See01-40-43 CRANKSHAFT POSITION 
(CKP) SENSOR INSPECTION[L3 WITH TC])

• Is the CKP sensor normal?

Yes

Go to the next step.

No

Inspect the CKP sensor pulse wheel for damage. Replace 
the CKP sensor pulse wheel and go to the next step.

11

VERIFY TROUBLESHOOTING OF DTC P0335 
COMPLETED

• Make sure to reconnect all disconnected 

connectors.

• Turn ignition switch to the ON position (Engine 

off).

• Clear the DTC from the PCM memory using 

the M-MDS.

• Start the engine.

• Access the MAF PID using the M-MDS.

Note

• The MAF PID should indicate 2.0 g/s 

{0.26 lb/min.} or above during this test

• Is the same DTC present?

Yes

Replace the PCM, then go to the next step.
 (See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH 
TC].)

No

Go to the next step.

12

VERIFY AFTER REPAIR PROCEDURE

• Perform the “After Repair Procedure”.

 (See01-02-10 AFTER REPAIR 
PROCEDURE[L3 WITH TC].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.
 (See01-02-13 DTC TABLE[L3 WITH TC].)

No

Troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P0340

Camshaft position (CMP) sensor circuit malfunction

DETECTION 

CONDITION

• PCM monitors the input voltage from the CMP sensor when engine is running. If the PCM does not receive 

the input voltage from the CMP sensor while the PCM receives the input signal from the CKP sensor, the 
PCM determines that the CMP circuit has a malfunction.

Diagnostic support note

• This is a continuous monitor (CCM).

• MIL illuminates if the PCM detects the above malfunction condition during first drive cycle.

• FREEZE FRAME DATA is available.

• DTCs are stored in the PCM memory.

POSSIBLE 

CAUSE

• CMP sensor malfunction

• Connector or terminal malfunction

• CMP sensor is dirty

• Short to the power circuit between CMP sensor terminal C and PCM terminal 2S

• Short to the power circuit between CMP sensor terminal B and PCM terminal 2P

• Short to ground circuit between CMP sensor terminal A and main relay

• Short to ground circuit between CMP sensor terminal C and PCM terminal 2S

• Open circuit between CMP sensor terminal A and main relay

• Open circuit between CMP sensor terminal B and PCM terminal 2P

• Open circuit between CMP sensor terminal C and PCM terminal 2S

• Both CMP sensor wires are shorted to each other

• CMP sensor pulse wheel malfunction

• CMP sensor misinstallation

• Timing chain misinstallation

• Loose timing chain or improper valve timing

• Loose camshaft sprocket lock bolt

• Loose crankshaft pulley lock bolt

• PCM malfunction

1871-1U-06B(01-02).fm  128 ページ  2006年3月15日 水曜日 午前10時32分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–129

01-02

Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS BEEN 
RECORDED

• Has the FREEZE FRAME DATA been 

recorded?

Yes

Go to the next step.

No

Record FREEZE FRAME DATA on the repair order, then go 
to the next step.

2

VERIFY RELATED REPAIR INFORMATION 
AVAILABILITY

• Check for related Service Bulletins and/or on-

line repair information availability.

• Is any related repair information available?

Yes

Perform the repair or diagnosis according to the available 
repair information.

• If the vehicle is not repaired, go to the next step.

No

Go to the next step.

3

VERIFY CMP SENSOR VOLTAGE

• Disconnect the CMP sensor connector.

• Connect a voltmeter between CMP sensor 

connector terminals A and C (sensor-side).

• Inspect the voltage in AC range while cranking 

the engine.

• Is there any voltage?

Yes

Go to the next step.

No

Go to step 10.

4

INSPECT CMP SENSOR CONNECTOR FOR 
POOR CONNECTION

• Verify that the CMP sensor connector is 

connected securely.

• Is the connector normal?

Yes

Go to the next step.

No

Reconnect the connector, then go to Step 15.

DTC P0340

Camshaft position (CMP) sensor circuit malfunction

PCM

B

C

2S

A

2P

A

B

C

CMP SENSOR

WIRING HARNESS-SIDE CONNECTOR

CMP SENSOR

3

4

5

4

3

4

5

10

9

8

8

6

6

MAIN RELAY

PCM

WIRING HARNESS SIDE CONNECTOR

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

7 9

7 9

1871-1U-06B(01-02).fm  129 ページ  2006年3月15日 水曜日 午前10時32分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–130

5

INSPECT CMP CIRCUIT FOR SHORT TO 
POWER

• Turn ignition switch OFF.

• Disconnect the CMP sensor connector.

• Turn ignition switch to the ON position (Engine 

off)

• Measure voltage between the following 

terminals:

— CMP sensor connector terminal C (harness-

side) and body ground

— CMP sensor connector terminal B (harness-

side) and body ground

• Is the voltage B+?

Yes

Repair or replace the suspected wiring harness, then go to 
Step 15.

No

Go to the next step.

6

INSPECT CMP CIRCUIT FOR SHORT TO 
GROUND

• Inspect for continuity between the following 

terminal and body ground:
— CMP sensor connector terminal A (harness-

side)

— CMP sensor connector terminal C (harness-

side)

• Is there continuity?

Yes

Repair or replace the suspected wiring harness, then go to 
Step 15.

No

Go to the next step.

7

INSPECT CMP CIRCUITS FOR SHORT CIRCUIT

• Inspect for continuity between CMP sensor 

connector terminals A and C (harness-side).

• Is there continuity?

Yes

Repair or replace the suspected wiring harness, then go to 
Step 15.

No

Go to the next step.

8

INSPECT PCM CONNECTOR FOR POOR 
CONNECTION

• Disconnect the PCM connector.

• Inspect for poor connection (damaged, pulled-

out terminals, corrosion, etc.).

• Is there any malfunction?

Yes

Repair the terminal, then go to Step 15.

No

Go to the next step.

9

INSPECT CMP CIRCUIT FOR OPEN CIRCUIT

• Inspect for continuity between the following 

circuits:

— CMP sensor terminal A (harness-side) and 

main relay

— CMP sensor terminal B (harness-side) and 

PCM terminal 2P (harness-side)

— CMP sensor terminal C (harness-side) and 

PCM terminal 2S (harness-side)

• Is there continuity?

Yes

Go to Step 11.

No

Repair or replace the suspected wiring harness, then go to 
Step 15.

10

INSPECT CMP SENSOR

• Turn the ignition switch off.

• Perform the CMP sensor inspection.

 (See01-40-45 CAMSHAFT POSITION (CMP) 
SENSOR INSPECTION[L3 WITH TC].)

• Is the CMP sensor normal?

Yes

Go to the Step 15.

No

Replace the CMP sensor and go to Step 15.

11

VERIFY CMP SENSOR INSTALLATION

• Verify the CKP sensor installation.

 (See01-40-45 CAMSHAFT POSITION (CMP) 
SENSOR REMOVAL/INSTALLATION[L3 WITH 
TC].)

• Is the CMP sensor installed correctly?

Yes

Go to the next step.

No

Reinstall the CKP sensor and go to Step 15.

12

VERIFY VALVE TIMING MECHANISM 
INSTALLATION

• Verify the valve timing mechanism installation 

for the following parts:

— Timing chain misinstallation

— Loose camshaft sprocket lock bolt

— Loose crankshaft pulley lock bolt

• Is the valve timing mechanism installed 

correctly?

Yes

Go to the next step.

No

Reinstall the following parts and go to Step 15.

• Timing chain

• Camshaft sprocket

• Crankshaft pulley

STEP

INSPECTION

ACTION

1871-1U-06B(01-02).fm  130 ページ  2006年3月15日 水曜日 午前10時32分

 

 

 

 

 

 

 

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