Mazda CX-9 Grand Touring. Manual - part 306

2



Verify related Service Bulletins 
availability.  



Is any related Service Bulletins 
available?  



If vehicle is not repaired, go to next step.  

No

Go to next step.

3

VERIFY THE BRAKE PEDAL WAS 
APPLIED  



Was the brake pedal applied and 
released during the KOEO self-
test?  

Yes Go to next step.

No

Perform the KOER self-test. 

Apply and release the brake pedal during the KORE 

test, then go to Step 10 (See KOEO/KOER SELF 

TEST [MZI-3.7].)

4

INSPECT THE OPERATION OF 
THE BLAKE/TAILLIGHT  



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



Depress and release the brake 
pedal and check the blake/taillight 
operation.  



Do the blake/taillight operate 
correctly?  

Yes Go to next step.

No

Repair or replace harness or blake/taillight, then go 

to Step 10.

5

INSPECT THE CRUISE CONTROL 
OPERATION  



Check for cruise control 
operation.  



Does the cruise control operate 
correctly?  

Yes Go to next step.

No Repair or replace suspected part, then go to Step 10.

6

INSPECT BRAKE SWITCH AND 
PCM CONNECTOR FOR POOR 
CONNECTION  



Turn the ignition switch off.  



Disconnect the throttle body 
connector.  



Inspect for poor connection (such 
as damaged/pulled-out pins, 
corrosion).  



Are there any malfunction?  

Yes Repair or replace suspected part, then go to Step 10.

No

Go to the next step.

INSPECT BRAKE SWITCH NO.1 
CIRCUIT MALFUNCTION  



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



Measure the voltage between 

Yes Go to 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 357 

© 2005 Mitchell Repair Information Company, LLC. 

7

PCM terminal 1T (wiring harness-
side) and body ground.  



Verify the following values when 
the brake pedal to the floor and 
releasing. 



Brake pedal fully depressed: 
more than 10 V  



Brake pedal fully released: 
less than 1.0 V  



Is the voltage normal?  

No Repair or replace suspected part, then go to Step 10.

8

INSPECT BRAKE SWITCH  



Inspect the brake switch. (See 
BRAKE SWITCH 
INSPECTION .)  



Is there any malfunction?  

Yes Repair or replace suspected part, then go to Step 10.

No

Go to the next step.

9

INSPECT FOR CORRECT PCM 
OPERATION  



Disconnect all the PCM 
connectors.  



Visually inspect for: 



Pushed out pins  



Corrosion  



Connect all the PCM connectors 
and verify that they seat correctly. 



Retrieve DTCs using the M-MDS. 



Is the PENDING CODE for this 
DTC present?  

Yes Go to the next step.

No

The system is correctly. Go to the next step.

10

VERIFY TROUBLESHOOTING OF 
DTC P1703 HAS BEEN 
COMPLETED  



Verify that all disconnected 
connectors reconnected.  



Clear DTC from memory using 
M-MDS.  



Perform KOEO/KOER Self-Test.  



Is PENDING CODE same as 
DTC present?  

Yes

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

No

Go to next step.

VERIFY AFTER REPAIR 
PROCEDURE  

 

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 358 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P2100 [MZI-3.7] 

DTC P2100 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

11



Perform "AFTER REPAIR 
PROCEDURE". 

(See AFTER REPAIR 
PROCEDURE [MZI-3.7].) 



Are any DTCs present?  

Yes

Go to the applicable DTC inspection. (See DTC 
TABLE [MZI-3.7].)

No

Troubleshooting completed.

DTC P2100

Throttle actuator circuit open

DETECTION 

CONDITION 



A PCM malfunction flag is set indicating the motor circuit is open.  

POSSIBLE CAUSE 



Throttle actuator malfunction  



Connector or terminal malfunction  



Open circuit wiring harness between throttle body terminal A and PCM 
terminal 2BO  



Short to power supply in wiring harness between throttle body terminal A and 
PCM terminal 2BO  



Open circuit wiring harness between throttle body terminal B and PCM 
terminal 2BR  



Short to power supply in wiring harness between throttle body terminal B and 
PCM terminal 2BR  



Throttle actuator circuits are shorted each other  

 

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 359 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC P2100 (MZI-3.7) DIAGNOSTIC PROCEDURE 

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA 
HAS BEEN RECORDED  



Has FREEZE FRAME DATA been 
recorded?  

Yes Go to the next step.

No

Record FREEZE FRAME DATA on the repair 

order, then go to the next step.

2

VERIFY RELATED REPAIR 
INFORMATION AVAILABILITY  



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

Yes

Perform repair or diagnosis according to the 
available Service Bulletins. 



If the vehicle is not repaired, go to the next 

 

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 360 

© 2005 Mitchell Repair Information Company, LLC.