Mazda CX-9 Grand Touring. Manual - part 331

 

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Mazda CX-9 Grand Touring. Manual - part 331

 

 

12

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 appropriate DTC inspection. 
(See DTC TABLE [MZI-3.7] .) 
Communication error message is 
displayed:
  
Inspect for the following: 

Open circuit in wiring harness 
between main relay and PCM 
terminal 1 BO or 1BJ  

Open main relay GND circuit  

Main relay is stuck open.  

Open or short circuit in wiring 
harness between the DLC-2 and 
PCM terminals 1BL or 1BG  

Open or poor GND circuit (PCM 
terminal 1D, 1J, 1BP, 1BK)  

Poor connection of vehicle body 
GND  

No

No DTC is displayed:  

Go to the next step.

13

Attempt to start engine at part throttle. 
Does engine run smoothly at part throttle?

Yes

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

No

Go to the next step.

14

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

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  

 

If CKP sensor and wiring harness are 

normal, go to the next step.

Visually inspect CKP sensor and teeth of 

 

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 30 

© 2005 Mitchell Repair Information Company, LLC. 

15

crankshaft pulley. 
Are CKP sensor and teeth of crankshaft 
pulley normal?

Yes

Go to the next step.

No

Replace the malfunctioning part.

16

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.

17

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. 
If symptoms occurs with the A/C on, go to 
Step 23.

No

Repair or replace the malfunctioning part 

according to spark test result.

18

Inspect the spark plug condition. 
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 spark plugs on original cylinders.

Go to the next step.

19

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

Yes

Go to the next step.

No

Replace the PCV valve.

20

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

Yes

Replace the suspected part.

No

Go to the next step.

21

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 with ignition 
switch ON? 
(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] .)

22

Visually inspect for fuel leakage at fuel 
injector O-ring and fuel line. 
Service if necessary. 
Is fuel line pressure held after ignition 
switch is turned off? 
(See FUEL LINE PRESSURE 

Yes

Go to the next step.

No

Inspect the fuel injector. 

If the fuel injector is normal, replace the 

fuel pump unit. 

(See FUEL PUMP UNIT 

REMOVAL/INSTALLATION [MZI-

 

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 31 

© 2005 Mitchell Repair Information Company, LLC. 

INSPECTION [MZI-3.7] .)

3.7] .)

23

Connect pressure gauges to A/C low and 
high pressure side lines.Turn A/C on and 
measure low side and high side 
pressures.Are pressures within 
specifications?(See REFRIGERANT 
PRESSURE CHECK
 .)

NOTE:

The following test is for stall 
concerns with the A/C on. If other 
symptoms exist, go to the next 
step.  

Yes

Go to the next step.

No

If A/C is always on, go to symptom 

troubleshooting "No.24 A/C is always on 

or A/C compressor runs continuously". 

(See NO.24 A/C IS ALWAYS ON OR 

A/C COMPRESSOR RUNS 

CONTINUOUSLY [MZI-3.7].) 

For other symptoms, inspect the following:

Refrigerant charging amount  

Condenser fan operation  

24

Disconnect the vacuum hose between the 
purge solenoid valve and the intake 
manifold from purge solenoid side. 
Plug opening end of vacuum hose. 
Start the engine. 
Is the engine stall now eliminated?

Yes

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

No

Go to the next step.

25

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

Yes

Repair or replace the malfunctioning part.

No

Go to the next step.

26

Inspect 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 parts 

according to variable valve timing control 

system operation inspection results.

27

Is the engine compression correct?

Yes

Inspect the valve timing.

No

Inspect for cause.

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] .) 

 

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 32 

© 2005 Mitchell Repair Information Company, LLC. 

NO.6 CRANKS NORMALLY BUT WILL NOT START [MZI-3.7] 

NO.6 CRANKS NORMALLY BUT WILL NOT START (MZI-3.7) DETECTION CONDITIONS AND 
POSSIBLE CAUSES
 

6

CRANKS NORMALLY BUT WILL NOT START

DESCRIPTION 

The starter cranks engine at normal speed but the engine will not run.  

Refer to symptom troubleshooting "NO.5 ENGINE STALLS" if this symptom 
appears after engine stall.  

Fuel is in tank.  

Battery is in normal condition.  

POSSIBLE 

CAUSE 

No battery power supply to PCM  

Air leakage from intake-air system  

Open PCM GND or vehicle body GND  

Improper operation of electronic throttle control system  

No signal from CKP sensor due to sensor, related wire or incorrect installation  

No signal from CMP sensor due to sensor, related wire or incorrect installation  

Low engine compression  

Engine overheating  

Vacuum leakage  

Erratic signal to ignition coil  

Improper air/fuel mixture ratio control  

Poor fuel quality  

PCV valve malfunction  

Restriction in intake-air system  

Restriction in exhaust system  

Disconnected electrical connector  

Open or short circuit in fuel pump body and related wiring harness  

Inadequate fuel pressure  

Fuel pump mechanical malfunction  

Fuel leakage from injector  

Fuel injector is clogged.  

Purge solenoid valve malfunction  

Spark plug malfunction  

Ignition coil malfunction  

Improper variable valve timing control system operation  

Improper valve timing  

Immobilizer system and/or circuit malfunction  

Immobilizer system operating properly. (Ignition key is not registered.)  

 

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 33 

© 2005 Mitchell Repair Information Company, LLC. 

 

 

 

 

 

 

 

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