Mazda CX-9 Grand Touring. Manual - part 338

 

  Index      Mazda     Mazda CX-9 Grand Touring - service repair manual 2008 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  336  337  338  339   ..

 

 

Mazda CX-9 Grand Touring. Manual - part 338

 

 

NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE (MZI-3.7) DIAGNOSTIC PROCEDURE

STEP

INSPECTION

RESULTS

ACTION

1

Verify the following: 

Vacuum connection  

Restriction in intake-air system (such 
as air cleaner element, fresh air duct) 

No air leakage from intake-air system 

No restriction of intake-air system  

Proper sealing of intake manifold and 
components attached to intake 
manifold  

Fuel quality (such as proper octane, 
contamination, winter/summer blend) 

 
Are all items normal?

Yes

Go to the next step.

No

Service if necessary. 

Repeat Step 1.

2

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.

3

Is the engine overheating?

Yes

Go to symptom troubleshooting "No. 17 
Cooling system concerns-Overheating".

No

Go to the next step.

4

Connect the M-MDS to the DLC-2. 
Access APP1, APP2, APP3, RPM, MAF, 
TP1, TP2, IAT and VSS PIDs. 
Drive vehicle while monitoring PIDs. 
Are PIDs within specifications? 
(See PCM INSPECTION [MZI-3.7] .)

Yes

Go to the next step.

No

APP1, APP2, APP3 PIDs:  

Inspect if output signal accelerator pedal 

position sensor changes smoothly. 

RPM PID:  

Inspect CKP sensor and related wiring 

harness for vibration or intermittent 

open/short circuit or both. 

MAF PID:  

Inspect for intermittent open circuit of 

MAF sensor and related wiring harness.

TP1, TP2 PID:  

Inspect if output signal TP sensor changes 

smoothly. 

IAT PID:  

Inspect for air suction in intake-air 

system. 

If normal, inspect intermittent short circuit 

of IAT sensor and related 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 58 

© 2005 Mitchell Repair Information Company, LLC. 

VSS PID:  

Inspect for intermittent open circuit of 

VSS and related wiring harness.

5

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

Yes

Go to the next step.

No

Replace the malfunctioning part.

6

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 the fuel injector for fuel leakage. 
Inspect spark plug and high-tension lead.
Spark plug is grayish white:  
Inspect the fuel injector for clogging.

No

Install the spark plugs on original 

cylinders. 

Go to the next step.

7

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

Yes

Go to the next step.

No

Replace PCV valve.

8

Perform electronic throttle control system 
operation inspection. 
(See ENGINE CONTROL SYSTEM 
OPERATION INSPECTION [MZI-3.7]
.)
Does electronic throttle control system 
function properly?

Yes

Go to the next step.

No

Repair or replace the malfunctioning part 

according to electronic throttle control 

system operation inspection results.

9

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

Yes

Replace the suspected part.

No

Go to the next step.

10

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 to ON position? 
(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] .)

NOTE:

The following test is for engine 
stalling with the A/C on concern. If 

Yes

Go to the next step.

If A/C is always on, go to symptom 

troubleshooting "No.24 A/C is always on 

or A/C compressor runs continuously". 

 

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 59 

© 2005 Mitchell Repair Information Company, LLC. 

11

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

other symptoms exist, go to the 
next step.  

No

(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  

12

Inspect for A/C cut-off operation. 
(See ENGINE CONTROL SYSTEM 
OPERATION INSPECTION [MZI-3.7]
.)
Does the A/C cut-off function properly?

Yes

Go to the next step.

No

Inspect A/C cut-off system components.

13

Disconnect the vacuum hose between the 
purge solenoid valve and the intake 
manifold from purge solenoid valve side. 
Plug opening end of vacuum hose. 
Drive the vehicle. 
Does the engine condition improve?

Yes

Inspect if purge solenoid valve is stuck 
open mechanically. 
Inspect the evaporative emission control 
system. 
(See ENGINE CONTROL SYSTEM 
OPERATION INSPECTION [MZI-
3.7]
.)

No

Go to the next step.

14

Visually inspect the CMP sensor and 
projections of camshaft pulley. 
Are the CMP sensor and projections of 
camshaft pulley normal?

Yes

Go to the next step.

No

Replace the malfunctioning part.

15

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

Yes

Go to the next step.

No

Repair or replace the malfunctioning part 

according to variable valve timing control 

system inspection results.

16

Is the engine compression correct?

Yes

Inspect the following: 

Valve timing  

Internal transaxle components  

Brake system for dragging  

No

Inspect for cause.

17

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. 

 

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 60 

© 2005 Mitchell Repair Information Company, LLC. 

NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE [MZI-3.7] 

NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE (MZI-3.7) DETECTION CONDITIONS 
AND POSSIBLE CAUSES
 

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] .) 

13

KNOCKING/PINGING - ACCELERATION/CRUISE

DESCRIPTION 

Sound is heard when air/fuel mixture is ignited by something other than spark plug 
(such as hot spot in combustion chamber).

POSSIBLE 

CAUSE 

Engine overheating due to cooling system malfunction  

CHT sensor malfunction  

IAT sensor malfunction  

MAF sensor malfunction  

Knock sensor malfunction  

Erratic signal from CMP sensor  

Inadequate engine compression  

Inadequate fuel pressure 

WARNING:

The following troubleshooting flow chart contains the fuel system diagnosis 
and repair procedures. Read the following warnings before servicing the fuel 
system: 

Fuel vapor is hazardous. It can easily ignite, causing serious injury 
and damage. Always keep sparks and flames away from fuel.  

Fuel line spills and leakage are dangerous. Fuel can ignite and cause 
serious injuries or death and damage. Fuel can also irritate skin and 
eyes. To prevent this, always complete "BEFORE SERVICE 
PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this 
manual. 

(See BEFORE SERVICE PRECAUTION [MZI-3.7] .) 

(See AFTER SERVICE PRECAUTION [MZI-3.7] .) 

CAUTION:

Disconnecting/connecting quick release connector without cleaning it 
may cause damage to fuel pipe and quick release connector. Always 
clean quick release connector joint area before 
disconnecting/connecting, and make sure that it is free of foreign 

 

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 61 

© 2005 Mitchell Repair Information Company, LLC. 

 

 

 

 

 

 

 

Content   ..  336  337  338  339   ..