Mazda CX-9 Grand Touring. Manual - part 228

 

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Mazda CX-9 Grand Touring. Manual - part 228

 

 

terminal 2AS  

DTC P0059: Open circuit between front HO2S (LH) terminal A and PCM 
terminal 2E  

DTC P0060: Open circuit between rear HO2S (LH) terminal A and PCM 
terminal 2AO  

HO2S heater malfunction  

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:34 AM

Page 45 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC P0053, P0054, P0059, P0060 (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 POWER SUPPLY IN 
WIRING HARNESS
  

Disconnect the suspect HO2S 
connector.  

Perform the KOEO self-test.  

Measure the voltage between the 
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, then go to step 9.

4

INSPECT HO2S HEATER FOR 
SHORT TO GROUND
  

Disconnect the PCM.  

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

Yes Go to the next step.

No

Repair or replace suspected part, 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 10:08:34 AM

Page 46 

© 2005 Mitchell Repair Information Company, LLC. 

Is the resistance more than 10 
kilohms?  

5

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 9

6

INSPECT HO2S HEATER CIRCUIT 
FOR OPEN CIRCUIT IN WIRING 
HARNESS
  

For DTC P0053 Measure resistance 
between PCM terminal 2J and front 
HO2S (RH) terminal A.  

For DTC P0054 Measure resistance 
between PCM terminal 2AS and rear 
HO2S (RH) terminal A.  

For DTC P0059 Measure resistance 
between PCM terminal 2E and front 
HO2S (LH) terminal A.  

For DTC P0060 Measure resistance 
between PCM terminal 2AO and 
rear HO2S (LH) terminal A.  

Is the resistance less than 5.0 ohms? 

Yes Go to the next step.

No

Repair or replace suspected part, Go to Step 9.

7

INSPECT INTERNAL RESISTANCE 
OF HO2S HEATER
  

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

Yes Go to the next step.

No

Replace the HO2S. 

(See FRONT HEATED OXYGEN SENSOR 

(HO2S) REMOVAL/INSTALLATION [MZI-

3.7] .) 

(See REAR HEATED OXYGEN SENSOR 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:34 AM

Page 47 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0068 [MZI-3.7] 

DTC P0068 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

Is the resistance between 3-30 
ohms?  

(HO2S) REMOVAL/INSTALLATION [MZI-

3.7] .) Go to Step 9.

8

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

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

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

Is the resistance more than 10 
kilohms?  

Yes Replace the PCM. Go to the next step.

No

Replace the 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.

9

VERIFY TROUBLESHOOTING OF 
MISFIRE DTC HAS BEEN 
COMPLETED
  

Verify that all disconnected 
connectors 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.

10

VERIFY AFTER REPAIR 
PROCEDURE
  

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 P0068

MAP/MAF-throttle position correlation

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:34 AM

Page 48 

© 2005 Mitchell Repair Information Company, LLC. 

 

 

 

 

 

 

 

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