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.