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
20
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
1
Visually inspect fuel leakage at fuel line.
Is there any fuel leakage?
Yes
Service if necessary.
No
Go to the next step.
2
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.
No
Reconnect the vacuum hose.
3
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.
No
Go to the next step.
4
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.
No
Replace the purge solenoid valve.
5
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
2
, 2175 psi} or less?
Yes
Inspect the charcoal canister for fuel saturation.
If excess amount of liquid fuel is present, replace the
charcoal canister.
No
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].)
5
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
21
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
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
1
Is the noise from the turbocharger?
Yes
Go to Step 8.
No
Go to the next step
2
Is squeal, click or chirp sound present?
Yes
Inspect the engine oil level, solenoid valves installation
or drive belt tension.
No
Go to the next step.
3
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.)
No
Go to the next step.
4
Is rattle sound present?
Yes
Inspect the location of rattle for loose parts.
No
Go to the next step.
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SYMPTOM TROUBLESHOOTING [L3 WITH TC]
01-03–67
01-03
End Of Sie
NO.22 VIBRATION CONCERNS (ENGINE)[L3 WITH TC]
id010339802800
Diagnostic procedure
5
Is hiss sound present?
Yes
Inspect and repair the following;
• Vacuum leakage
• Spark plug looseness
• Intake-air system leakage
No
Go to the next step.
6
Is rap or roar sound present?
Yes
Inspect the exhaust system or loose parts.
No
Go to the next step.
7
Is knocking noise present?
Yes
Go to symptom troubleshooting “NO.13 KNOCKING/
PINGING”.
(See01-03-50 NO.13 KNOCKING/PINGING[L3 WITH
TC].)
No
If noise comes from engine internal, inspect for the
friction gear, timing chain or MLA noise.
8
Inspect the intake and exhaust housing system
for loose installation.
Is there any problem found?
Yes
Repair installation or replace suspected part.
No
Go to the next step.
9
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.
No
Go to the next step.
10
Inspect the turbocharger compressor wheel
locknut is loose or has fallen down inside
turbocharger.
Is there any problem?
Yes
Replace the turbocharger.
No
Go to the next step.
11
Turn the turbocharger compressor wheel by
hand.
Does the wheel turn easily and smoothly?
Yes
Go to the next step.
No
Replace the turbocharger.
12
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.
No
Install the removal parts at Step 9, and inspect all
turbocharger related parts installed correctly.
13
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
22
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
1
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.
No
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
2
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
23
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
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 test.
No
No DTC is displayed:
Go to the next step.
2
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.
No
Go to the next step.
3
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.
No
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
4
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.
No
Inspect the following and repair or replace if necessary:
• Refrigerant charging amount
• A/C compressor for seizure
5
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
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