Mazda CX-9 Grand Touring. Manual - part 209

Open circuit 



If there is no continuity, the circuit is open. Repair or replace the wiring harness. 



MAF/IAT sensor terminal A and main relay No.1 terminal D  



MAF/IAT sensor terminal C and PCM terminal 1AJ  



MAF/IAT sensor terminal D and PCM terminal 1 AN  



MAF/IAT sensor terminal E and PCM terminal 1AL  

Short circuit 



If there is continuity, the circuit is shorted. Repair or replace the wiring harness. 



MAF/IAT sensor terminal A and body ground  



MAF/IAT sensor terminal C and power supply  



MAF/IAT sensor terminal C and body ground  



MAF/IAT sensor terminal D and power supply  



MAF/IAT sensor terminal D and body ground  



MAF/IAT sensor terminal E and power supply  

INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [MZI-3.7] 

RESISTANCE INSPECTION 

1. Disconnect the MAF/IAT sensor connector.  

2. Measure the resistance between MAF/IAT sensor terminals A and F. 

Fig. 12: Identifying MAF/IAT Sensor Terminals 
Courtesy of MAZDA MOTORS CORP. 



If not within the specification, replace the MAF/IAT sensor. (See MASS AIR FLOW 
(MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION 

NOTE:



Before performing the following inspection, make sure to follow the 
procedure as indicated in the troubleshooting flowchart. (See HOW TO 
USE THIS MANUAL .)  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Control System (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:07:19 AM

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© 2005 Mitchell Repair Information Company, LLC. 

[MZI-3.7].)  



If the monitor item status/specification (reference) is not within the specification, even though the 
resistance is within the specification, perform the "Circuit Open/Short Inspection".  

IAT sensor resistance  

IAT SENSOR RESISTANCE SPECIFICATION CHART 

IAT sensor characteristics graph (reference)  

Fig. 13: Temperature Vs Resistance Graph 
Courtesy of MAZDA MOTORS CORP. 

CIRCUIT OPEN/SHORT INSPECTION 

IAT (°C {°F}) Resistance (kilohm)

10(50}

Approx. 58.75

20 {68}

Approx. 37.30

30 {86}

Approx. 24.27

60 {140}

Approx. 7.70

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Control System (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:07:19 AM

Page 16 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 14: Identifying MAF/IAT Sensor Connector And PCM Wiring Harness Side Connector 
Courtesy of MAZDA MOTORS CORP. 

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [MZI-3.7].)  

2. Inspect the following wiring harnesses for open or short. (Continuity inspection)  

Open circuit 



If there is no continuity, the circuit is open. Repair or replace the wiring harness. 



MAF/IAT sensor terminal B and body ground  



MAF/IAT sensor terminal F and PCM terminal 1AF  

Short circuit 



If there is continuity, the circuit is shorted. Repair or replace the wiring harness. 



MAF/IAT sensor terminal B and power supply  



MAF/IAT sensor terminal F and body ground  



MAF/IAT sensor terminal F and power supply  

THROTTLE POSITION (TP) SENSOR INSPECTION [MZI-3.7] 

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Control System (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:07:19 AM

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© 2005 Mitchell Repair Information Company, LLC. 

VOLTAGE INSPECTION 

1. Verify that no DTC related to APP sensor has been detected. 



If any DTCs related to APP sensor have been detected, perform the DTC inspection. (See DTC 
TABLE [MZI-3.7] .)  

2. Connect the M-MDS to the DLC-2.  

3. Turn the ignition switch to the ON position.  

4. Select TP1 or TP2 PID (voltage) on the M-MDS. 

Fig. 15: Identifying DLC-2 Connector 
Courtesy of MAZDA MOTORS CORP. 

5. Operate the accelerator pedal and verify that the TP1 or TP2 PID (voltage) changes as shown in the 

following graph. 



If not verified, perform the "Circuit Open/Short Inspection". 



If there is no open or short circuit, replace the throttle body. (See INTAKE-AIR SYSTEM 
REMOVAL/INSTALLATION [MZI-3.7] .) 

Fig. 16: Throttle Angle & Voltage Graph (Degrees)

NOTE:



Before performing the following inspection, make sure to follow the 
procedure as indicated in the troubleshooting flowchart. (See HOW TO 
USE THIS MANUAL .)  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Control System (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:07:19 AM

Page 18 

© 2005 Mitchell Repair Information Company, LLC.