Mazda CX-9 Grand Touring. Manual - part 210

Courtesy of MAZDA MOTORS CORP.

CIRCUIT OPEN/SHORT INSPECTION 

Fig. 17: Throttle Body Wiring Harness Side Connector & 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 circuit. (Continuity inspection)  

Open circuit 



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



Throttle body terminal C and PCM terminal 2AD  



Throttle body terminal D and PCM terminal 2D  



Throttle body terminal E and PCM terminal 2AH  



Throttle body terminal F and PCM terminal 2Z  

Short circuit 

 

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 19 

© 2005 Mitchell Repair Information Company, LLC. 



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



Throttle body terminal C and power supply  



Throttle body terminal C and body ground  



Throttle body terminal D and body ground  



Throttle body terminal E and power supply  



Throttle body terminal F and body ground  



Throttle body terminal F and power supply  

ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [MZI-3.7] 

VOLTAGE INSPECTION 

1. Turn the ignition switch to the ON position (Engine OFF).  

2. Verify that the PCM terminal 1 AC, 1 AG and 1 AK change smoothly while throttle valve is gradually 

opened. 



If as verified, go to next step.  



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



If there is no open or short circuit, replace the throttle body.  

3. Verify that the PCM terminal 1 AC, 1 AG and 1 AK voltages are as shown in the following table. 

Fig. 18: Identifying PCM Wiring Harness Side-Connector 
Courtesy of MAZDA MOTORS CORP.

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 20 

© 2005 Mitchell Repair Information Company, LLC. 



If voltage is not as following table, perform the "Circuit Open/Short Inspection". 



If there is no open or short circuit, replace accelerator pedal. (See ACCELERATOR 
PEDAL REMOVAL/INSTALLATION [MZI-3.7] .)  

APP sensor output voltage  

APP SENSOR OUTPUT VOLTAGE SPECIFICATION CHART 

CIRCUIT OPEN/SHORT INSPECTION 

Fig. 19: Identifying Accelerator Pedal Position Sensor & 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 circuit. (Continuity inspection)  

Condition

PCM terminal 1AK (APP 

sensor No.1)

PCM terminal 1AG (APP 

sensor No.2)

PCM terminal 1 AC 

(APP sensor No.3)

Accelerator pedal 
released

Approx. 4.1 V

Approx. 1.5 V

Approx. 0.1 V

Accelerator pedal 
depressed

Approx. 1.0 V

Approx. 3.9 V

Approx. 3.3 V

 

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 21 

© 2005 Mitchell Repair Information Company, LLC. 

Open circuit 



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



APP sensor terminal B and PCM terminal 1 AC  



APP sensor terminal C and PCM terminal 1AH  



APP sensor terminal D and PCM terminal 1Y  



APP sensor terminal E and PCM terminal 1AK  



APP sensor terminal F and PCM terminal 1BA  



APP sensor terminal G and PCM terminal 1AD  

Short circuit 



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



APP sensor terminal B and body ground  



APP sensor terminal B and power supply  



APP sensor terminal C and power supply  



APP sensor terminal D and body ground  



APP sensor terminal E and body ground  



APP sensor terminal E and power supply  



APP sensor terminal F and body ground  



APP sensor terminal G and power supply  

CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [MZI-
3.7] 

NOTE:



Disconnect the connector after the CKP sensor is removed to prevent the 
CKP sensor from falling off.  



The bolt and sensor are integrated and cannot be pulled out.  



When removing the CKP sensor, be careful not to drop the tool.  



The bolt and sensor must be pulled in different directions. Pull them as 
indicated in the figure. 

Fig. 20: Identifying CKP Sensor 

 

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 22 

© 2005 Mitchell Repair Information Company, LLC.