Content .. 90 91 92 93 ..

Mazda CX 7. Manual - part 92

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–65

01-03

NO.20 FUEL ODOR (IN ENGINE COMPARTMENT)[L3 WITH TC]

id010339802600

Diagnostic procedure

End Of Sie

FUEL ODOR (IN ENGINE COMPARTMENT)

DESCRIPTION

Gasoline fuel smell or visible leakage

POSSIBLE CAUSE

• Excessive fuel pressure

• Purge solenoid valve malfunction

• Fuel system vent system blockage

• Evaporative gas leakage

• Improper connection of evaporative related vacuum hoses

• Charcoal canister malfunction

• Fuel leakage from fuel system

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

• 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 injury or

death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete
“BEFORE REPAIR ROCEDURE” and “AFTER REPAIR PROCEDURE” described in this
manual.
(See01-14-4 BEFORE REPAIR PROCEDURE[L3 WITH TC].)
(See01-14-4 AFTER REPAIR PROCEDURE[L3 WITH TC].)

Caution

• Disconnecting/connecting the quick release connector without cleaning it may possibly

cause damage to the fuel pipe and quick release connector. Always clean the quick release
connector joint area before disconnecting/connecting, and make sure that it is free of
foreign material.

STEP

INSPECTION

RESULTS

ACTION

Visually inspect fuel leakage at fuel line.
Is there any fuel leakage?

Yes

Service if necessary.

Go to the next step.

Inspect the vacuum hose routine.
(See01-13-4 VACUUM HOSE ROUTING
DIAGRAM[L3 WITH TC].)
Are vacuum hoses routines properly?

Yes

Go to the next step.

Reconnect the vacuum hose.

Perform the Evaporative Emission (EVAP)
System Leak Inspection.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
Is there any problem found?

Yes

Repair or replace suspected part according to the
inspection results.

Go to the next step.

Inspect the airflow of purge solenoid valve.
(See01-16-9 PURGE SOLENOID VALVE
INSPECTION[L3 WITH TC].)
Is the purge solenoid airflow properly?

Yes

Go to the next step.

Replace the purge solenoid valve.

Connect the M-MDS to the DLC-2.
Access the FUEL_PRESPID.
Monitor the FUEL_PRES PID while idle and race
the engine.
Is the FUEL_PRES PID indicate15 MPa {153
kgf/cm

, 2175 psi} or less?

Yes

Inspect the charcoal canister for fuel saturation.
If excess amount of liquid fuel is present, replace the
charcoal canister.

Inspect the fuel pressure sensor and the high pressure
fuel pump.
(See01-40-35 FUEL PRESSURE SENSOR
INSPECTION[L3 WITH TC].)
(See01-14-19 HIGH PRESSURE FUEL PUMP
INSPECTION[L3 WITH TC].)

Verify test results.

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

• If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the

repair or diagnosis.
— If the vehicle is repaired, troubleshooting is completed.

— If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later

calibration is available. Retest.

1871-1U-06B(01-03).fm 65 ページ２００６年３月１５日　水曜日　午前１０時３６分

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–66

NO.21 ENGINE NOISE[L3 WITH TC]

id010339802700

Diagnostic procedure

ENGINE NOISE

DESCRIPTION

Engine noise under hood

POSSIBLE CAUSE

Squeal, click or chirp noise:

• Improper engine oil level

• Loose installation of solenoid valves

• Improper drive belt tension

Rumble or grinding sound noise:

• Loose parts

• Fluid revel low or air in power the steering fluid

• Improper drive belt tension

Hiss sound noise:

• Vacuum leakage

• Loose spark plug

• Air leakage from the intake-air system

Rattle noise:

• Loose parts

Rap or roar noise:

• Exhaust system looseness

Excessive noise from turbocharger:

• Foreign objects or material in the compressor inlet to the intake manifold ducting or the compressor

housing

• Carbon built-up in the turbine housing

• Turbocharger routing assembly banding or dragging

• Loose intake or exhaust ducting systems

Other noise:

• Camshaft friction gear noise or MLA noise

• Timing chain noise

Warning

The following troubleshooting flow chart contains the fuel system diagnosis and

repair procedures. Read the following warnings before performing the fuel system
services:

• 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 injury or

Caution

• Disconnecting/connecting the quick release connector without cleaning it may possibly

cause damage to the fuel pipe and quick release connector. Always clean the quick release
connector joint area before disconnecting/connecting, and make sure that it is free of
foreign material.

STEP

INSPECTION

RESULTS

ACTION

Is the noise from the turbocharger?

Yes

Go to Step 8.

Go to the next step

Is squeal, click or chirp sound present?

Yes

Inspect the engine oil level, solenoid valves installation
or drive belt tension.

Go to the next step.

Is rumble or grinding sound present?

Yes

Inspect and repair the following;

• Drive belt tension

• Loose parts in engine compartment

• Power steering system fluid level

If normal, perform the power steering fluid line air
bleed.
(See06-14-3 AIR BLEEDING.)

Go to the next step.

Is rattle sound present?

Yes

Inspect the location of rattle for loose parts.

Go to the next step.

1871-1U-06B(01-03).fm 66 ページ２００６年３月１５日　水曜日　午前１０時３６分

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–67

01-03

End Of Sie

NO.22 VIBRATION CONCERNS (ENGINE)[L3 WITH TC]

id010339802800

Diagnostic procedure

Is hiss sound present?

Yes

Inspect and repair the following;

• Vacuum leakage

• Spark plug looseness

• Intake-air system leakage

Go to the next step.

Is rap or roar sound present?

Yes

Inspect the exhaust system or loose parts.

Go to the next step.

Is knocking noise present?

Yes

Go to symptom troubleshooting “NO.13 KNOCKING/
PINGING”.
(See01-03-50 NO.13 KNOCKING/PINGING[L3 WITH
TC].)

If noise comes from engine internal, inspect for the
friction gear, timing chain or MLA noise.

Inspect the intake and exhaust housing system
for loose installation.
Is there any problem found?

Yes

Repair installation or replace suspected part.

Go to the next step.

Remove the parts necessary to inspect
turbocharger without removing the turbocharger.
Inspect if turbocharger compressor wheel is
bent, damaged, or interfering with housing on
vehicle.
Is there any problem?

Yes

Replace the turbocharger.

Go to the next step.

Inspect the turbocharger compressor wheel
locknut is loose or has fallen down inside
turbocharger.
Is there any problem?

Yes

Replace the turbocharger.

Go to the next step.

Turn the turbocharger compressor wheel by
hand.
Does the wheel turn easily and smoothly?

Yes

Go to the next step.

Replace the turbocharger.

Visually inspect the turbine housing.
Is there any carbon built-up or foreign material
on turbine housing?

Yes

Clean built-up carbon or remove foreign materials.
If turbine housing damaged, replace the turbocharger.

Install the removal parts at Step 9, and inspect all
turbocharger related parts installed correctly.

Verify test results.

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

• If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the

repair or diagnosis.

— If the vehicle is repaired, troubleshooting is completed.

— If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later

calibration is available. Retest.

STEP

INSPECTION

RESULTS

ACTION

VIBRATION CONCERNS (ENGINE)

DESCRIPTION

• Vibration from under the hood or driveline

POSSIBLE CAUSE

• Loose attaching bolts or worn parts

• Components malfunction such as worn parts

STEP

INSPECTION

RESULTS

ACTION

Inspect the following components for loose
attaching bolts or worn parts:

• Cooling fan

• Condenser fan

• Drive belt and pulley

• Engine mounts

• Exhaust system

Are all items normal?

Yes

Inspect the following systems:

• Wheels

• Transmission and mounts

• Driveline

• Suspension

Service if necessary.

Readjust or retighten suspect parts installation
position.
Service if necessary for other parts.

1871-1U-06B(01-03).fm 67 ページ２００６年３月１５日　水曜日　午前１０時３６分

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–68

End Of Sie

NO.23 A/C DOES NOT WORK SUFFICIENTLY[L3 WITH TC]

id010339802900

Diagnostic procedure

End Of Sie

Verify test results.

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

• If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the

repair or diagnosis.

— If the vehicle is repaired, troubleshooting is completed.

— If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later

calibration is available. Retest.

STEP

INSPECTION

RESULTS

ACTION

A/C DOES NOT WORK SUFFICIENTLY.

DESCRIPTION

A/C compressor magnetic clutch does not engage when A/C switch is turned on.

POSSIBLE CAUSE

• Improper refrigerant charging amount

• Open A/C magnetic clutch

• Open circuit between the A/C relay and the A/C magnetic clutch

• Poor ground of A/C magnetic clutch

• Refrigerant pressure switch is stuck open.

• A/C relay is stuck open.

• Seized A/C compressor

• Open circuit between the A/C switch and the PCM through both the refrigerant pressure switch and

the A/C amplifier

STEP

INSPECTION

RESULTS

ACTION

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 test.

No DTC is displayed:
Go to the next step.

Disconnect the A/C compressor connector.
Start the engine and turn the A/C switch on.
Is there correct voltage at terminal of A/C
compressor magnetic clutch connector?

Specification

10.5 V or more

Yes

Inspect for the ground condition of magnetic clutch on
A/C compressor.
If ground condition is normal, inspect for an open circuit
magnetic clutch coil.

Go to the next step.

Disconnect the refrigerant pressure switch
connector.
Connect jumper wire between terminals of A/C
high-pressure switch connector.
Connect jumper wires between terminals of
refrigerant pressure switch connector.
Turn the ignition switch to the ON position.
Turn A/C switch on and set blower fan to any
speed.
Does A/C work?

Yes

Inspect the refrigerant pressure switch operation.
If switch is normal, go to the next step.

Inspect for the following:

• A/C switch is stuck open.

• Open circuit between refrigerant pressure switch

and PCM terminal 1AC

• Open circuit between blower motor fan switch and

resistor (if blower motor does not operate)

• Evaporator temperature sensor and A/C amplifier

Remove jumper wire from switch connector.
Reconnect connector to refrigerant pressure
switch.
Start engine and turn A/C switch on.
Does fan operate?

Yes

Inspect the whether A/C relay is stuck open.
Replace if necessary.

Inspect the following and repair or replace if necessary:

• Refrigerant charging amount

• A/C compressor for seizure

Verify test results.

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

• If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the

repair or diagnosis.

— If the vehicle is repaired, troubleshooting is completed.

— If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later

calibration is available. Retest.le. Retest.

1871-1U-06B(01-03).fm 68 ページ２００６年３月１５日　水曜日　午前１０時３６分

Content .. 90 91 92 93 ..