Mazda CX-9 Grand Touring. Manual - part 245

 

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Mazda CX-9 Grand Touring. Manual - part 245

 

 

DIAGNOSTIC PROCEDURE 

DTC P0172, P0175 (MZI-3.7) DIAGNOSTIC PROCEDURE 

POSSIBLE CAUSE 

Fuel rail pressure sensor bias  

Purge solenoid valve is leaking when the canister is full  

 
Base engine: 

Engine oil contamination  

 
Intake Air System: 

Damaged or contaminated MAF sensor  

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS BEEN 
RECORDED
  

Has 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
  

Verify related Service Bulletins and/or on-
line repair information availability.  

Is any related Service Bulletins available?  

Yes

Perform repair or diagnosis according to 
the available Service Bulletins. 

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 any DTCs present other than the 
following: 

P0172, P0175, P2196 or P2198?  

Yes

Go to the appropriate DTC 
troubleshooting procedures. (See DTC 
TABLE [MZI-3.7]
.)

No

Go to the next step.

4

INSPECT ENTIRE INTAKE AIR SYSTEM 
FOR DEBRIS, BLOCKAGE OR OTHER 
DAMAGE
  

Check the intake air system for obstructions, 
restrictions, and damage.  

Yes

Repair if necessary. 
Then go to Step 9.

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:08:35 AM

Page 113 

© 2005 Mitchell Repair Information Company, LLC. 

Check the throttle plate for obstructions or 
sludge.  

Check the air filter element and housing for 
blockage.  

Is a concern present?  

No

Go to the next step.

5

INSPECT FUEL PRESSURE 

 

Remove the jumper wire(s).  

Connect the HO2S connector.  

Relieve the fuel pressure.  

Connect the mechanical fuel pressure gauge  

Pressurize the fuel system.  

Turn the ignition switch to the ON position 
(Engine running)  

Allow the fuel pressure to stabilize.  

Turn the ignition switch off.  

Turn the ignition switch to the ON position 
(Engine running)  

Access the PCM and control the FP PID.  

Run the fuel pump to obtain maximum fuel 
pressure.  

Is the fuel pressure within the range for the 
vehicle being diagnosed?  

WARNING:

Fuel line spills and leakage are dangerous. 
Fuel can ignite and cause serious injuries 
or death. Fuel can also irritate skin and 
eyes. To prevent this, always complete the 
"BEFORE REPAIR PROCEDURE".  

NOTE:

For vehicle specific fuel pressure ranges, 
refer to the "FUEL LINE PRESSURE 
INSPECTION ".  

Yes Go to the next step.

No

Replace the fuel pump unit. Then go to 

Step 9.

6

INSPECT FUEL INJECTOR OPERATION  

Remove fuel injector.  

Inspect the injector operation.  

Is the fuel injector normal?  

Yes Go to the next step.

No

Replace the fuel injector. 

Then go to Step 9.

INSPECT HO2S OUTPUT VOLTAGE  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:08:36 AM

Page 114 

© 2005 Mitchell Repair Information Company, LLC. 

7

Visually inspect the HO2S circuit for 
exposed wiring, contamination, corrosion and 
correct assembly. Repair if necessary.  

Measure the voltage between HO2S terminal 
B and D on the component side.  

Increase the engine speed to 2,000 rpm for 3 
min.  

Turn the ignition switch to the ON position 
(Engine running)  

Monitor the signal voltage.  

Is the voltage more than 0.5 V at any time 
during the engine running?  

Yes Go to the next step.

No

Replace the HO2S. 

Then go to Step 9.

8

PERFORM THOROUGH WIGGLE TEST ON 
HO2S WIRING HARNESS
  

Turn the ignition switch off.  

Connect the HO2S connector.  

Turn the ignition switch to the ON position 
(Engine running)  

Verify that the engine is at normal operating 
temperature.  

Access the PCM and monitor the HO2S 
signal PID.  

Wiggle, shake, and bend small sections of the 
wiring harness while working from the 
sensor to the PCM.  

While monitoring the HO2S PID, does the 
HO2S stop switching?  

Yes

Isolate the concern and repair if 
necessary. 
Then go to the next step.

No

Go to the next step.

9

VERIFY TROUBLESHOOTING OF DTC 
P0172, P0175 HAS BEEN COMPLETED
  

Verify that all disconnected connectors are 
reconnected.  

Turn the ignition switch to the ON position 
(Engine off).  

Clear the DTC from the PCM memory using 
the M-MDS.  

Start the engine and run it at idle.  

Retrieve DTCs using the M-MDS.  

Is the PENDING CODE for this DTC 
present?  

Yes

Replace the PCM, then go to the next 
step. (See PCM 
REMOVAL/INSTALLATION [MZI-
3.7]
 .)

No

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:08:36 AM

Page 115 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0201 [MZI-3.7] 

DTC P0201 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

10

Perform "AFTER REPAIR PROCEDURE". 
(See AFTER REPAIR PROCEDURE 
[MZI-3.7]
.)  

Are any DTC present?  

Yes

Go to the applicable DTC inspection. 
(See DTC TABLE [MZI-3.7].)

No

Troubleshooting completed.

DTC P0201

Injector circuit/open-cylinder No.1

DETECTION 

CONDITION 

The CCM monitors the operation of the fuel injector drivers in the PCM. The test
fails if the fuel injector circuitry is inoperative.  

POSSIBLE CAUSE 

Fuel injector No.1 malfunction  

Connector or terminal malfunction  

Open circuit between fuel pump relay and fuel injector No.1 terminal B  

Open circuit between fuel injector No.1 terminal A and PCM terminal 2BJ  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:08:36 AM

Page 116 

© 2005 Mitchell Repair Information Company, LLC. 

 

 

 

 

 

 

 

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