Mazda CX-9 Grand Touring. Manual - part 241

 

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Mazda CX-9 Grand Touring. Manual - part 241

 

 

 

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 97 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC P0135, P0141, P0155, P0161 (MZI-3.7) DIAGNOSTIC PROCEDURE 

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

INSPECT FOR SOURCE OF 
POTENTIAL HO2S CONTAMINATION
 

Investigate the following items as 
potential sources of HO2S 
contamination: 

Use of unapproved silicon sealers 

Fuel contaminated by silicon 
additives  

Excessive oil consumption  

Glycol leaking internally in the 
engine  

Lead-contaminated fuel  

Short drive cycles in cold 
weather  

Use of unapproved cleaning 
agents  

Is a concern present?  

Yes

Repair the source of the contamination. Change 
the engine oil and oil filter. Then go to the next 
step.

No

Go to the next step.

4

VISUALLY INSPECT HO2S WIRING 
HARNESS
  

Connect the PCM connector.  

Visually inspect the HO2S wiring 
harness for exposed wiring water 
contamination, corrosion, and proper 
assembly.  

Is a concern present?  

Yes

Repair or replace suspected part, Then go to 
Step 12.

No

Go to the next step.

 

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 98 

© 2005 Mitchell Repair Information Company, LLC. 

5

INSPECT POWER SUPPLY IN WIRING 
HARNESS
  

Disconnect suspect HO2S connector.  

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

Measure the voltage between suspect 
HO2S connector terminal A and C, on 
the wiring harness side.  

Is the voltage more than 10 V?  

Yes

Turn the ignition switch off. Go to the next 
step.

No Repair or replace suspected part, Go to Step 12.

6

INSPECT HO2S HEATER FOR SHORT 
TO GROUND
  

Disconnect the PCM connector.  

Measure the resistance between HO2S 
terminal A on the wiring harness side 
and body ground.  

Is the resistance more than 10 kilohms? 

Yes Go to the next step.

No Repair or replace suspected part, Go to Step 12.

7

INSPECT HO2S HEATER FOR SHORT 
IN WIRING HARNESS
  

Measure the resistance between the 
following terminals: 

HO2S terminal A (wiring 
harness-side) and HO2S terminal 
C (wiring harness-side)  

HO2S terminal A (wiring 
harness-side) and HO2S terminal 
D (wiring harness-side)  

HO2S terminal A (wiring 
harness-side) and HO2S terminal 
B (wiring harness-side)  

Are the resistances more than 10 
kilohms?  

Yes Go to the next step.

No Repair or replace suspected part, Go to Step 12.

8

INSPECT HO2S HEATER CIRCUIT 
FOR OPEN CIRCUIT IN WIRING 
HARNESS
  

For DTC P0135, measure the resistance 
between PCM terminal 2J and front 
HO2S (RH) terminal A.  

For DTC P0141, measure the resistance 
between PCM terminal 2AS and rear 
HO2S (RH) terminal A.  

Yes Go to the next step.

 

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 99 

© 2005 Mitchell Repair Information Company, LLC. 

For DTC P0155, measure the resistance 
between PCM terminal 2E and front 
HO2S (LH) terminal A.  

For DTC P0161, measure the resistance 
between PCM terminal 2AO and rear 
HO2S (LH) terminal A.  

Is the resistance less than 5.0 ohms?  

No Repair or replace suspected part, Go to Step 12.

9

INSPECT INTERNAL RESISTANCE OF 
HO2S HEATER
  

Measure the resistance between the 
suspect HO2S terminal A and C, on the 
component side.  

Is the resistance between 3-30 ohms?  

Yes Go to the next step.

No

Replace HO2S. 

(See FRONT HEATED OXYGEN SENSOR 

(HO2S) REMOVAL/INSTALLATION 

[MZI-3.7] .) 

(See REAR HEATED OXYGEN SENSOR 

(HO2S) REMOVAL/INSTALLATION 

[MZI-3.7] .) 

Go to Step 12.

10

INSPECT HO2S CASE FOR SHORT TO 
POWER SUPPLY, HTR, AND SIGNRTN
 

Measure the resistance between the 
suspect HO2S terminal A and D at 
component side.  

Measure the resistance between the 
suspect HO2S terminal A and body 
ground.  

Is the resistance more than 10 kilohms? 

Yes Go to the next step.

No

Replace HO2S. 

(See FRONT HEATED OXYGEN SENSOR 

(HO2S) REMOVAL/INSTALLATION 

[MZI-3.7] .) 

(See REAR HEATED OXYGEN SENSOR 

(HO2S) REMOVAL/INSTALLATION 

[MZI-3.7] .) 

Go to the next step.

11

INSPECT FOR CORRECT PCM 
OPERATION
  

Disconnect all the PCM connectors.  

Visually inspect for: 

Pushed out pins  

Corrosion  

Connect all the PCM connectors and 
verify that they seat correctly.  

Retrieve DTCs using the M-MDS.  

Is the PENDING CODE for this DTC 
present?  

Yes Go to the next step.

No

The system is correctly. Go to the next step.

VERIFY TROUBLESHOOTING OF 
MISFIRE DTC HAS BEEN 
COMPLETED
  

Verify that all disconnected connectors 

Yes

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

 

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 100 

© 2005 Mitchell Repair Information Company, LLC. 

 

 

 

 

 

 

 

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