Mazda CX-9 Grand Touring. Manual - part 333

 

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Mazda CX-9 Grand Touring. Manual - part 333

 

 

PCM terminal 1AD-APP sensor 

terminal G  

PCM terminal 1AG-APP sensor 

terminal H  

12

Connect the M-MDS to the DLC-2. 
Access the TP1, TP2 PID. Crank the 
engine with accelerator pedal released. 
Are the TP1, TP2 PID indicates the 
closed throttle position?

Yes

Go to the next step.

No

Inspect for the following: 

TP sensor  

Wiring harnesses and connectors for 

following: 

PCM terminal 2BO-TP sensor 

terminal A  

PCM terminal 2BR-TP sensor 

terminal B  

PCM terminal 2AD-TP sensor 

terminal C  

PCM terminal 2D-TP sensor 

terminal D  

PCM terminal 2AH-TP sensor 

terminal E  

PCM terminal 2Z-TP sensor 

terminal F  

13

Does the engine start with the throttle 
valve closed?

Yes

Go to Step 28.

No

Go to the next step.

14

Will the engine start and run smoothly at 
part throttle?

Yes

Inspect the electronic throttle control system 
operation. 
(See ENGINE CONTROL SYSTEM 
OPERATION INSPECTION [MZI-3.7]
.)

No

Go to the next step.

15

Connect the M-MDS to the DLC-2. 
Access RPM PID. 
Is RPM PID indicating the engine speed 
when cranking the engine?

Yes

Go to the next step.

No

Inspect for the following: 

Open or short circuit in CKP sensor  

Open or short circuit in wiring harness 

between CKP sensor terminal A and 

PCM terminal 2P  

Open or short circuit in wiring harness 

between CKP sensor terminal B and 

PCM terminal 2T  

Open or short circuit in CKP sensor 

wiring harnesses  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:10:05 AM

Page 38 

© 2005 Mitchell Repair Information Company, LLC. 

 

If CKP sensor and wiring harness are normal, 

go to the next step.

16

Visually inspect the CKP sensor and 
teeth of crankshaft pulley. 
Are CKP sensor and teeth of crankshaft 
pulley normal?

Yes

Go to the next step.

No

Replace the malfunctioning part.

17

Inspect the ignition coil related wiring 
harness condition (intermittent open or 
short circuit) for all cylinders. Are 
wiring harness conditions normal?

Yes

Go to the next step.

No

Repair the wiring harnesses.

18

Perform the spark test. 
(See ENGINE CONTROL SYSTEM 
OPERATION INSPECTION [MZI-
3.7]
.) 
Is strong blue spark visible at each 
cylinder?

Yes

Go to the next step.

No

Repair or replace the malfunctioning part 

according to spark test result.

19

Inspect the spark plug conditions. 
Is spark plug wet, covered with carbon 
or grayish white?

Yes

Spark plug is wet or covered with carbon: 
Inspect for fuel leakage from injector. 
Spark plug is grayish white:  
Inspect the fuel injector for clogging.

No

Install the spark plugs on original cylinders.

Go to the next step.

20

Remove and shake the PCV valve. 
Does the PCV valve rattle?

Yes

Go to the next step.

No

Replace the PCV valve.

21

visually inspect the exhaust system part.
Is there any deformed exhaust system 
part?

Yes

Replace the suspected part.

No

Go to the next step.

22

Install the fuel pressure gauge between 
the fuel pipe and the fuel distributor. 
Short check connector terminal F/P to 
body GND using a jumper wiring. 
Turn the ignition switch to the ON 
position. 
Is fuel line pressure correct when 
ignition switch is turned on/off five 
times?
  
(See FUEL LINE PRESSURE 
INSPECTION [MZI-3.7]
 .)

Yes

Go to the next step.

No

Zero or low:  

Inspect the fuel pump relay and fuel pump 

circuit. 

Inspect the fuel line for clogging. 

If there is no malfunction, replace the fuel 

pump unit. 

(See FUEL PUMP UNIT 

REMOVAL/INSTALLATION [MZI-

3.7] .) 
High:  

Replace the fuel pump unit. 

(See FUEL PUMP UNIT 

REMOVAL/INSTALLATION [MZI-

3.7] .)

Visually inspect the fuel injector O-ring 
and fuel line for fuel leakage. 

Yes

Go to the next step.

Inspect the fuel injector. 

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:10:05 AM

Page 39 

© 2005 Mitchell Repair Information Company, LLC. 

NO.7 SLOW RETURN TO IDLE [MZI-3.7] 

NO.7 SLOW RETURN TO IDLE (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

23

Service if necessary. 
Is the fuel line pressure held after the 
ignition switch is turned off? 
(See FUEL LINE PRESSURE 
INSPECTION [MZI-3.7]
 .)

No

If the fuel injector is normal, replace the fuel 

pump unit. 

(See FUEL PUMP UNIT 

REMOVAL/INSTALLATION [MZI-

3.7] .)

24

Disconnect the vacuum hose between 
the purge solenoid valve and the intake 
manifold from purge solenoid valve 
side. 
Plug opening end of vacuum hose. 
Start the engine. 
Is starting condition improved?

Yes

Inspect if the purge solenoid valve is stuck 
open mechanically. 
Inspect the evaporative emission control 
system.

No

Go to the next step.

25

Is air leakage felt or heard at intake-air 
system components while racing engine 
to higher speed?

Yes

Repair or replace the malfunctioning part.

No

Go to the next step.

26

Inspect the variable valve timing control 
system operation. 
(See ENGINE CONTROL SYSTEM 
OPERATION INSPECTION [MZI-
3.7]
.) 
Does variable valve timing control 
function properly?

Yes

Go to the next step.

No

Repair or replace the malfunctioning part.

27

Is the engine compression correct?

Yes

Inspect the valve timing.

No

Inspect for causes.

28

Verify test results. 

If normal, return to diagnostic index to service any additional symptoms. 

(See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7].) 

If malfunction remains, inspect related Service Bulletins and/or On-line Repair 
Information and perform repair or diagnosis. 

If vehicle is repaired, troubleshooting completed.  

If vehicle is not repaired or additional diagnostic information is not available, 
replace the PCM. 

(See PCM REMOVAL/INSTALLATION [MZI-3.7] .) 

7

SLOW RETURN TO IDLE

DESCRIPTION 

Engine takes more time than normal to return to idle speed.

CHT sensor malfunction  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:10:05 AM

Page 40 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

NO.7 SLOW RETURN TO IDLE (MZI-3.7) DIAGNOSTIC PROCEDURE 

POSSIBLE CAUSE 

Thermostat is stuck open.  

Throttle body malfunction  

Air leakage from intake-air system  

STEP

INSPECTION

RESULTS

ACTION

1

Connect the M-MDS to the DLC-2. 
Turn the ignition switch to the ON 
position (Engine off). 
Retrieve any DTCs. 
Are there any DTCs displayed?

Yes

DTC is displayed:  
Go to the appropriate DTC inspection. 
(See DTC TABLE [MZI-3.7] .)

No

No DTC is displayed:  

Go to the next step.

2

Remove thermostat and inspect operation.
(See THERMOSTAT 
REMOVAL/INSTALLATION [MZI-
3.7]
 .) 
(See THERMOSTAT INSPECTION 
[MZI-3.7]
 .) 
Is thermostat normal?

Yes

ECT and thermostat are normal. 
Go to the next step.

No

Access ECT PID on the M-MDS. 

Inspect for both ECT PID and temperature 

gauge on instrument cluster readings. 

If temperature gauge on instrument cluster 

indicates normal range but ECT PID is not 

same as temperature gauge reading, inspect 

CHT sensor. 

If temperature gauge on instrument cluster 

indicates cold range but ECT PID is normal, 

inspect temperature gauge and heat gauge 

unit.

3

Is throttle body free of contamination?

Yes

Inspect for air leakage from the intake-air 
system components while racing the engine 
to higher speed.

No

Clean or replace throttle body.

4

Verify test results. 

If normal, return to diagnostic index to service any additional symptoms. 

(See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7].) 

If malfunction remains, inspect related Service Bulletins and/or On-line Repair 
Information and perform repair or diagnosis. 

If vehicle is repaired, troubleshooting completed.  

If vehicle is not repaired or additional diagnostic information is not available, 
replace the PCM. 

(See PCM REMOVAL/INSTALLATION [MZI-3.7] .) 

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:10:05 AM

Page 41 

© 2005 Mitchell Repair Information Company, LLC. 

 

 

 

 

 

 

 

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