Mazda CX-9 Grand Touring. Manual - part 276

4



Fan control module No.1 
terminal 1A (wiring harness-side) 
and body ground.  



Fan control module No.2 
terminal A (wiring harness-side) 
and body ground.  

Single fan control module  



Fan control module terminal 1C 
(wiring harness-side) and body 
ground.  



Are there voltage B+?  

No

Repair or replace suspected part, then go to 

Step 10.

5

INSPECT FAN CONTROL MODULE 
GROUND CIRCUIT FOR OPEN 
CIRCUIT  



Turn the ignition switch off.  



inspect for continuity between the 
following circuits: 

Dual fan control module  



Fan control module No.1 
terminal 1C (wiring harness-side) 
and body ground.  



Fan control module No.2 
terminal C (wiring harness-side) 
and body ground.  

Single fan control module  



Fan control module terminal 1A 
(wiring harness-side) and body 
ground.  



Are there continuity?  

Yes Go to the next step.

No

Repair or replace suspected part, then go to 

Step 10.

INSPECT FAN CONTROL CIRCUIT 
FOR SHORT TO POWER  



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



Measure the voltage between the 
following circuits: 

Dual fan control module  

Yes

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

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:38 AM

Page 237 

© 2005 Mitchell Repair Information Company, LLC. 

6



Fan control module No.1 
terminal 1B (wiring harness-side) 
and body ground.  



Fan control module No.2 
terminal B (wiring harness-side) 
and body ground.  

Single fan control module  



Fan control module terminal 1B 
(wiring harness-side) and body 
ground.  



Are there voltage B+?  

No

Go to the next step.

7

INSPECT FAN CONTROL CIRCUIT 
FOR SHORT TO GROUND  



Turn the ignition switch off.  



Inspect continuity between the 
following circuits: 

Dual fan control module  



Fan control module No.1 
terminal 1B (wiring harness-side) 
and body ground.  



Fan control module No.2 
terminal B (wiring harness-side) 
and body ground.  

Single fan control module  



Fan control module terminal 1B 
(wiring harness-side) and body 
ground.  



Are there continuity?  

Yes

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

No

Go to the next step.

8

INSPECT PCM CONNECTOR FOR 
POOR CONNECTION  



Turn the ignition switch off.  



Disconnect PCM connector.  



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



Is there any malfunction?  

Yes

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

No

Go to the next step.

INSPECT FAN CONTROL CIRCUIT 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:38 AM

Page 238 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0505 [MZI-3.7] 

DTC P0505 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

9

FOR OPEN CIRCUIT  



Inspect continuity between the 
following circuits: 

Dual fan control module  



Fan control module No.1 
terminal 1B (wiring harness-side) 
and PCM terminal 1AM (wiring 
harness-side).  



Fan control module No.2 
terminal B (wiring harness-side) 
and PCM terminal 1AM (wiring 
harness-side).  

Single fan control module  



Fan control module terminal 1B 
(wiring harness-side) and PCM 
terminal 1AM (wiring harness-
side).  



Are there continuity?  

Yes Go to the next step.

No

Repair or replace suspected part, then go to the 

next step.

10

VERIFY TROUBLESHOOTING OF DTC 
P0480 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". (See KOEO/KOER SELF 
TEST [MZI-3.7].)  



Are any DTCs present?  

Yes

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

No

Go to the next step.

11

VERIFY AFTER REPAIR PROCEDURE 



Perform the "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.

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:38 AM

Page 239 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC P0505 (MZI-3.7) DIAGNOSTIC PROCEDURE 

DTC P0505

Idle speed control system problem

DETECTION 

CONDITION 



The PCM attempts to control engine speed during the KOER self-test. The test 
fails when the desired engine speed could not be reached or controlled during 
the self-test.  

POSSIBLE 

CAUSE 



Failure mode effects management condition is present  



Intake air restriction  



Exhaust restriction  



Sludged throttle body  



Vacuum leakage  



Throttle body malfunction  



PCM malfunction 

NOTE:



This DTC is informational only and it may be accompanied by other 
DTCs. Diagnose other DTCs first. If other DTCs are not present inspect 
the intake air system for air restrictions, vacuum leaks, and damage. If 
no concerns are present, clear the DTC and repeat the self-test.  

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 
availability.  



Is any related Service Bulletins 
available?  

Yes

Perform repair or diagnosis according to the 
available Service Bulletins. 



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

No

Go to the next step.

3

VERIFY RELATED PENDING CODE 
OR STORED DTCs  



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



Verify related pending code or 
stored DTCs.  



Are other DTCs present?  

Yes

Go to the appropriate DTC troubleshooting. (See 
DTC TABLE [MZI-3.7].)

No

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 10:08:38 AM

Page 240 

© 2005 Mitchell Repair Information Company, LLC.