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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[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

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© 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

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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.