Mazda CX-9 Grand Touring. Manual — part 312

2

INFORMATION AVAILABILITY



Verify related Service Bulletins and/or on-
line repair information availability.



Is any related Service Bulletins available?

Yes

available Service Bulletins.



If the vehicle is not repaired, go to the
next step.

No

Go to the next step.

3

INSPECT ACCELERATOR PEDAL FOR
OBSTRUCTION



Turn the ignition switch to the ON position
(Engine off).



Depress the accelerator pedal fully to the
floor and release.



Does the pedal move freely to the floor and
back?

Yes Go to the next step.

No

Isolate and repair the obstruction. Then go

to Step 12.

4

INSPECT APP SENSOR SIGNAL
VOLTAGE RANGES FOR ACCELERATOR
PEDAL FULLY APPLIED AND DEPRESS
POSITIONS



Access the PCM and monitor the APP1,
APP2 and APP3 PIDs.



Verify the following values of the PIDs
when depressing the accelerator pedal fully
to the floor.



APP1: 0.48-1.79 V



APP2: 2.95-4.62 V



APP3: 2.43-4.02 V



Verify the following values of the PIDs
when press the accelerator pedal release.



APP1: 3.43-4.69 V



APP2: 1.13-1.88V



APP3: 0.64-1.28 V



Are all PIDs signals out of range for the
pedal fully depressing and released
positions?

Yes Go to the next step.

No

Go to Step 6.

5

INSPECT REFERENCE VOLTAGE TO APP
SENSOR



Turn the ignition switch off.



Disconnect the APP sensor connector.



Turn the ignition switch to the ON position
(Engine off).

Yes 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 10:08:42 AM

Page 381

© 2005 Mitchell Repair Information Company, LLC.



Measure the voltage between the APP
sensor connector D or F terminal (wiring
harness side) and the APP sensor connector
C or G terminal (wiring harness side)



Is the voltage between 4-6 V?

No

Repair if necessary. Then go to Step 12.

6

INSPECT FUNCTIONALITY OF APP
CIRCUITS



Are APP1, APP2 or APP3 out of range?

NOTE:



Use the voltage measurements from
Step 4.

Yes Go to the next Step.

No

Go to Step 11.

7

INSPECT FUNCTIONALITY OF APP
SENSOR



Turn the ignition switch off.



Disconnect the APP sensor connector.



Measure the resistance between the
following APP sensor terminals (APP
sensor component side).



E and D or F: 600-1,370 ohms



E and C or G: 720-1,660 ohms



E and H: 1,300-2,960 ohms



E and B: 1,250-2,860 ohms



H and D or F: 750-1,720 ohms



H and C or G: 660-1,520 ohms



H and B: 1,230-2,810 ohms



B and D or F: 710-1,640 ohms



B and C or G: 580-1,340 ohms



D or F and C or G: 200-470 ohms



Are all the resistances within
specifications?

Yes Go to next Step.

No

Replace the accelerator pedal. Then go to

Step 12.

8

INSPECT APP SENSOR SIGNAL CIRCUIT
FOR OPEN CIRCUIT



Disconnect the PCM connector.



Inspect for continuity between the
following terminals:



P2121: APP sensor terminal E and

Yes 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 10:08:42 AM

Page 382

© 2005 Mitchell Repair Information Company, LLC.

PCM terminal 1AK



P2126: APP sensor terminal H and
PCM terminal 1AG



P2131: APP sensor terminal B and
PCM terminal 1AC



Are there continuity?

No

Repair or replace suspected part, then go to

Step 12.

9

INSPECT APP SENSOR SIGNAL CIRCUIT
FOR SHORT TO GROUND



Turn the ignition switch off.



Inspect for continuity between the
following terminals:



P2121: APP sensor terminal E and
body ground



P2126: APP sensor terminal H and
body ground



P2131: APP sensor terminal B and
body ground



Are there continuity?

Yes

Repair or replace suspected part, then go to
Step 12.

No

Go to the next Step.

10

INSPECT APP SENSOR SIGNAL CIRCUIT
FOR SHORT TO POWER SUPPLY



Turn the ignition switch to the ON position
(Engine off).



Measure the voltage between the following
terminals:



P2121: APP sensor terminal E and
body ground



P2126: APP sensor terminal H and
body ground



P2131: APP sensor terminal B and
body ground



Are the voltage B+?

Yes

Repair or replace suspected part, then go to
Step 12.

No

Go to the next Step.

INSPECT APP SENSOR SIGNAL CIRCUIT
FOR SHORT EACH OTHER



Turn the ignition switch off.



Disconnect PCM connector.



Disconnect APP sensor connector.



Measure the resistance between the
following APP sensor terminals (wiring
harness-side)

Yes 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 10:08:42 AM

Page 383

© 2005 Mitchell Repair Information Company, LLC.

11



P2121

E and H

E and B

E and D or F

E and C or G



P2126

H and E

H and B

H and D or F

H and C or G



P2131

Band E

B and H

B and D or F

B and C or G



Are there resistance greater than 10
kilohms?

No

Repair or replace suspected part, then go to

the next step.

12

VERIFY TROUBLESHOOTING OF DTC
P2121, P2126 or P2131 HAS BEEN
COMPLETED



Verify that all disconnected connectors
reconnected.



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



Perform the KOEO or KOER self-test
using the M-MDS.

(See KOEO/KOER SELF TEST [MZI-
3.7].)

Yes

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

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:08:42 AM

Page 384

© 2005 Mitchell Repair Information Company, LLC.