Mazda CX-9 Grand Touring. Manual - part 232



Are there voltage B+?  

7

INSPECT MAF SENSOR SIGNAL 
CIRCUIT FOR SHORT TO GROUND  



Turn the ignition switch off.  



Disconnect the MAF/IAT sensor and 
PCM connector.  



Inspect for continuity between the 
following circuits: 



MAF sensor terminal C (wiring 
harness-side) and body ground  



MAF sensor terminal D (wiring 
harness-side) and body ground  



Are there continuity?  

Yes

Repair or replace the malfunctioning part, then 
go to Step 10.

No

Go to next step.

8

INSPECT PCM CONNECTOR FOR 
POOR CONNECTION  



Turn the ignition switch off.  



Disconnect the MAF/IAT sensor 
connector.  



Inspect for poor connection (such as 
damaged/pulled-out pins, corrosion).  



Are there any malfunction?  

Yes

Repair or replace the malfunctioning part, then 
go to Step 10.

No

Go to next step.

9

INSPECT MAF SENSOR CIRCUIT FOR 
OPEN CIRCUIT  



Turn the ignition switch off.  



Disconnect the PCM connector.  



Disconnect the MAF/IAT sensor 
connector.  



Inspect for continuity between the 
following terminals: 



MAF sensor terminal C and 
PCM terminal 1AJ  



MAF sensor terminal D and 
PCM terminal 1AN  



Are there continuity?  

Yes Go to the next step.

No

Repair or replace suspected part, then go to the 

next step.

VERIFY TROUBLESHOOTING OF 
DTC P0104 HAS BEEN COMPLETED  



Verify that all disconnected connectors 
reconnected.  

Yes

Replace the PCM, then go to 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 10:08:34 AM

Page 61 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0111 [MZI-3.7] 

DTC P0111 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

DIAGNOSTIC PROCEDURE 

DTC P0111 (MZI-3.7) DIAGNOSTIC PROCEDURE 

10



Clear DTC from memory using M-
MDS.  



Start the engine.  



Perform the "KOEO/KOER self-
test" (See AFTER REPAIR 
PROCEDURE [MZI-3.7].)  



Is same DTC present?  

3.7] .)

No

Go to next step.

11

VERIFY AFTER REPAIR PROCEDURE
 



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



Are any DTCs present?  

Yes

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

No

Troubleshooting completed.

DTC P0111

IAT sensor circuit range/performance

DETECTION 

CONDITION 



Indicates the IAT rationality test has failed. This DTC indicates that the IAT 
value is higher than a calibrated value and could prevent 1 or more on-board 
diagnostic (OBD) monitors from completing. The PCM runs this logic after an 
engine off and a calibrated soak period (typically 6 hours) This soak period 
allows IAT and CHT to stabilize and not differ by more than a calibrated value. 
DTC P0111 is set when: the IAT at engine start exceeds the CHT by more than a 
calibrated value, typically 17°C {30°F}.  

POSSIBLE 

CAUSE 



IAT sensor malfunction  

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 

Yes

Perform repair or diagnosis according to the 
available Service Bulletins. 



If the vehicle is not repaired, 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 62 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0112 [MZI-3.7] 

DTC P0112 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

available?  

No

Go to the next step.

3

INSPECT IAT SENSOR  



Inspect IAT sensor. (See INTAKE-
AIR SYSTEM 
REMOVAL/INSTALLATION 
[MZI-3.7] .)  



Is IAT sensor normal?  

Yes Go to the next step.

No

Replace MAF/IAT sensor, then go to the next 

step. (See MASS AIR FLOW 

(MAF)/INTAKE AIR TEMPERATURE 

(IAT) SENSOR 

REMOVAL/INSTALLATION [MZI-3.7] .)

4

VERIFY TROUBLESHOOTING OF 
DTC P0111 HAS BEEN COMPLETED  



Verify that all disconnected connectors 
reconnected.  



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



Start engine and run engine under 
FREEZE FRAME DATA condition.  



Is PENDING CODE for this DTC 
present?  

Yes

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

No

Go to the next step.

5

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 P0112

IAT sensor circuit low input

DETECTION 

CONDITION 



Indicates that the sensor signal is less than the self-test minimum. The IAT 
sensor minimum is 0.2 V or 121°C {250°F}.  

POSSIBLE CAUSE 



Short to ground circuit between MAF/IAT sensor terminal F and PCM terminal 
1AF  



IAT sensor malfunction  



Connector or terminal malfunction  

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:35 AM

Page 63 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC P0112 (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.

VERIFY RELATED REPAIR 
INFORMATION AVAILABILITY  

Yes Perform repair or diagnosis according to the 

available Service Bulletins. 

 

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 64 

© 2005 Mitchell Repair Information Company, LLC.