Mazda CX 7. Manual - part 47

 

  Index      Mazda     Mazda CX 7 - service repair manual 2007 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  45  46  47  48   ..

 

 

Mazda CX 7. Manual - part 47

 

 

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–143

01-02

Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA AND 
DIAGNOSTIC MONITORING TEST RESULTS 
HAVE BEEN RECORDED

• Have the FREEZE FRAME DATA and 

DIAGNOSTIC MONITORING TEST RESULTS 
(EVAP system related) been recorded?

Yes

Go to the next step.

No

Record FREEZE FRAME DATA and DIAGNOSTIC 
MONITORING TEST RESULTS 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 diagnostic according to the available 
repair information.

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

No

Go to the next step.

3

CHECK COV CONTROL (EVAP SYSTEM LEAK 
DETECTION PUMP CIRCUIT FOR SHORT TO 
POWER)

• Turn ignition switch to the ON position (engine 

OFF).

• Disconnect the EVAP system leak detection 

pump connector.

• Measure the voltage between EVAP system 

leak detection pump connector terminal C 
(wiring harness-side) and body ground.

• Is the voltage B+?

Yes

Repair or replace the wiring harness, then go to Step 5.

No

Go to the next step.

4

INSPECT COV (EVAP SYSTEM LEAK 
DETECTION PUMP)

• Inspect the EVAP system leak detection pump.

 (See01-16-7 EVAPORATIVE EMISSION 
(EVAP) SYSTEM LEAK DETECTION PUMP 
INSPECTION[L3 WITH TC].)

• Is the COV (EVAP system leak detection 

pump) normal?

Yes

Go to the next step.

No

Replace the EVAP system leak detection pump, then go to 
the next step.

DTC P0446

Change over valve (COV) (EVAP system leak detection pump) stuck close

EVAP SYSTEM LEAK DETECTION PUMP 
WIRING HARNESS-SIDE CONNECTOR

EVAP SYSTEM LEAK
DETECTION PUMP

PCM

PCM WIRING

HARNESS-SIDE CONNECTOR

A

B

C

D

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

1V

1AS

C

D

M

B

A

MAIN RELAY

3

4

1871-1U-06B(01-02).fm  143 ページ  2006年3月15日 水曜日 午前10時32分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–144

End Of Sie

DTC P0455[L3 WITH TC]

id010239815500

5

VERIFY TROUBLESHOOTING OF DTC P0446 
COMPLETED

• Make sure to reconnect all disconnected 

connectors.

• Turn the ignition switch to the ON position 

(Engine off).

• Clear the DTC from the PCM memory using 

the M-MDS.

• Perform the EVAP system test using the M-

MDS.
 (See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)

• Is the same DTC present?

Note

• If the EVAP system test function is not 

available, preform the following 
procedure:
— Perform “EVAP System Repair 

Verification Drive Mode”.
 (See01-02-10 OBD-II DRIVE 
MODE[L3 WITH TC])

— Is the PENDING CODE for this DTC 

present?

Yes

Replace the PCM, then go to the next step.

No

Go to the next step.

6

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 P0455

Evaporative emission control system leak detected (gross leak)

DETECTION 

CONDITION

• PCM measures the pump load current (EVAP line pressure) when a specified period has passed after the 

EVAP system is sealed when monitoring conditions are met. If the load does not reach the reference 
current value within the specified period, the PCM determines that the EVAP system has a gross leak.

MONITORING CONDITION

— IG switch OFF

— IAT: 5— 35 

°C {40— 95 °F}

— Battery voltage: 11— 20 V

— Atmospheric pressure: 72.2 kPa {542 mmHg, 21.3 inHg} or above

— Fuel tank level: 15— 85%

Diagnostic support note

• This is an intermittent monitor (Evaporative system monitor).

• MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in 

one drive cycle while the DTC for the same malfunction has been stored in the PCM.

• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive 

cycle.

• FREEZE FRAME DATA is available.

• DTCs are stored in the PCM memory.

• DIAGNOSTIC MONITORING TEST RESULT is available.

POSSIBLE 

CAUSE

• Purge solenoid valve malfunction

• EVAP system leak detection pump malfunction

• Loose, missing or detective fuel filler cap

• Charcoal canister malfunction

• Fuel tank malfunction

• Fuel tank misinstallation

• EVAP hose damaged or loose

• Poor connection or damaged vacuum hose

1871-1U-06B(01-02).fm  144 ページ  2006年3月15日 水曜日 午前10時32分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–145

01-02

Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA AND 
DIAGNOSTIC MONITORING TEST RESULTS 
HAVE BEEN RECORDED

• Have the FREEZE FRAME DATA and 

DIAGNOSTIC MONITORING TEST RESULTS 
(Evaporative emission system related) been 
recorded?

Yes

Go to the next step.

No

Record FREEZE FRAME DATA and DIAGNOSTIC 
MONITORING TEST RESULTS 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 RELATED PENDING CODE OR 
STORED DTCS

• Turn the ignition switch off then to the ON 

position (Engine off).

• Verify related PENDING CODE or stored 

DTCs.

• Are DTCs P0443 and/or P0446 present?

Yes

Go to the appropriate DTC troubleshooting procedure.

No

Go to the next step.

4

CLASSIFY INTERMITTENT CONCERN OR 
CONTINUOUS CONCERN

• Perform the evaporative system leak 

inspection.
 (See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)

• Does test result fail?

Yes

Go to the next step.

No

Intermittent concern exists. Inspect the purge solenoid 
valve and the EVAP system leak detection pump circuit for 
an intermittent concern.
 (See01-03-76 INTERMITTENT CONCERN 
TROUBLESHOOTING[L3 WITH TC].)

5

INSPECT FUEL FILLER CAP

• Verify that the fuel-filler cap is neither 

disconnected nor loose or damaged.

• Is it normal?

Note

• When a fuel-filler cap other than an OEM 

cap is attached, it is considered a 
malfunction.

Yes

Go to the next step.

No

Retighten the fuel-filler cap or replace it if it is damaged.
Go to Step 17.

6

INSPECT IF PURGE SOLENOID VALVE IS 
STUCK

• Inspect the purge solenoid valve.

• Is the purge solenoid valve normal?

Yes

Go to the next step.

No

Replace the purge solenoid valve, then go to Step 17.

7

INSPECT COV (EVAP SYTEM LEAK 
DETECTION PUMP)

• Inspect the EVAP system leak detection pump.

• Is the COV (EVAP leak detection pump) 

normal?

Yes

Go to the next step.

No

Replace the EVAP system leak detection pump, then go to 
Step 17.

8

DETERMINE IF EVAP CONTROL SYSTEM FOR 
LEAKAGE OR BLOCKAGE

Note

• If the evaporative emission tester is not 

available, then go to the next step.

• Perform the Evaporative System Leak 

Inspection.

• Does the system test fail?

Yes

Repair or replace malfunctioning area, then go to Step 17.

No

Go to the next step.

9

INSPECT LEAKAGE OF CHARCOAL CANISTER 
TO FUEL PUMP

• Disconnect the fuel tank side vacuum hose at 

the charcoal canister.

• Apply vacuum 1.7 KPa {13 mmHg, 0.5 inHg} 

to the disconnected vacuum hose using a 
vacuum pump.

• Does the vacuum hold for a minimum of 

min?

Yes

Go to the Step 13.

No

Go to the next step.

1871-1U-06B(01-02).fm  145 ページ  2006年3月15日 水曜日 午前10時32分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–146

End Of Sie

10

VERIFY POOR CONNECTION OF VACUUM 
HOSE

• Verify the vacuum hose installation condition 

between the fuel tank and the charcoal 
canister.

• Is a poor connection detected?

Yes

Connect the vacuum hose correctly, then go to Step 17.

No

Go to the next step.

11

INSPECT FUEL TANK INSTALLATION

• Remove the fuel tank.

• Visually inspect for damage, insufficient sealing 

or poorly installed fuel pump unit.

• Is it normal?

Yes

Go to the next step.

No

Repair or replace the fuel tank or sealing, then go to Step 
17.

12

INSPECT FUEL TANK

• Inspect the fuel tank.

• Is it normal?

Yes

Replace the vacuum hose from the charcoal canister to the 
fuel tank, then go to the next step.

No

Replace the fuel tank, then go to the next step.

13

INSPECT LEAKAGE FROM CHARCOAL 
CANISTER TO PURGE SOLENOID VALVE

• Disconnect the purge solenoid valve side 

vacuum hose at the charcoal canister.

• Apply vacuum 3.3 KPa {25 mmHg, 1.0 inHg} 

to the disconnected vacuum hose using a 
vacuum pump.

• Does the vacuum hold for a minimum of 2 

min?

Yes

Go to the Step 17.

No

Go to the next step.

14

VERIFY POOR CONNECTION OF VACUUM 
HOSE

• Verify the vacuum hose installation condition 

between the purge solenoid valve and the 
charcoal canister.

• Is a poor connection detected?

Yes

Connect the vacuum hose correctly, then go to Step 17.

No

Go to the next step.

15

INSPECT PURGE SOLENOID VALVE FOR 
DAMAGE OR AIR LEAKAGE

• Remove the purge solenoid valve and inspect 

for damage and air leakage.

• Is it normal?

Yes

Go to the next step.

No

Replace the purge solenoid valve, then go to Step 17.

16

INSPECT CHARCOAL CANISTER

• Remove the charcoal canister and inspect for 

clogging, damage and pinholes.

• Is it normal?

Yes

Replace the vacuum hose from the charcoal canister to the 
purge solenoid valve, then go to the next step.

No

Replace the charcoal canister, then go to the next step.

17

PERFORM LEAK INSPECTION

• Connect all disconnected connectors.

• Perform the evaporative system leak 

inspection. (See01-03-78 ENGINE CONTROL 
SYSTEM OPERATION INSPECTION[L3 WITH 
TC].)

• Does the test result fail?

Yes

Leakage still exists. Locate the leak point and repair.
Then go to the next step.

No

Go to the next step

18

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

1871-1U-06B(01-02).fm  146 ページ  2006年3月15日 水曜日 午前10時32分

 

 

 

 

 

 

 

Content   ..  45  46  47  48   ..