Mazda 6. Manual — part 173
F–214
TROUBLESHOOTING
End Of Sie
NO.16 HIGH OIL CONSUMPTION/LEAKAGE
A6E398018881W18
Diagnostic procedure
End Of Sie
5
Is strong blue spark visible at each disconnected
high-tension lead while cranking engine?
Yes
Inspect for following:
• Spark plugs malfunction
• Improperly installed CMP sensor
• Damage of trigger wheel on camshaft
• Open or short circuit on CMP sensor
• Open or short circuit between CMP sensor and
PCM terminal 2J or 2M
Repair or replace malfunctioning parts.
If okay, go to next step.
No
Inspect following:
• High-tension leads
• Ignition coil and connector
6
Install fuel pressure gauge between fuel pipe
and fuel distributor.
Start engine and run it at idle.
Measure fuel line pressure at idle.
Is fuel line pressure correct at idle?
(See
Yes
Go to next step.
No
Zero or low:
Inspect for clogged fuel line.
If okay, replace fuel pump unit.
High:
Replace fuel pump unit.
7
Remove and shake PCV valve.
Does PCV valve rattle?
Yes
Go to next step.
No
Replace PCV valve.
8
Inspect for fuel saturation inside charcoal
canister.
Is excess amount of liquid fuel present in
canister?
Yes
Replace charcoal canister.
No
Inspect fuel tank vent system.
Then, go to next step.
9
Is there restriction in exhaust system?
Yes
Inspect exhaust system.
No
Inspect EGR system.
(See
F–233 EGR Control System Inspection
10
Inspect threeway catalytic converter.
(See
.)
Is threeway catalytic converter okay?
Yes
Inspect EGR system.
(See
F–233 EGR Control System Inspection
No
Replace threeway catalytic converter.
11
Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.
STEP
INSPECTION
RESULTS
ACTION
16
HIGH OIL CONSUMPTION/LEAKAGE
DESCRIPTION
Oil consumption is excessive.
POSSIBLE CAUSE
• PCV valve malfunction
• Improper dipstick
• Improper engine oil viscosity
• Engine internal parts malfunction
STEP
INSPECTION
RESULTS
ACTION
1
Remove and shake PCV valve.
Does PCV valve rattle?
Yes
Go to next step.
No
Replace PCV valve.
2
Inspect for following:
• External leakage
• Proper dipstick
• Proper engine oil viscosity
Are all items okay?
Yes
Inspect internal engine parts such as valves, valve
guides, valve stem seals, cylinder head drain passage,
and piston rings.
No
Service as necessary.
Repeat Step 2.
3
Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.
TROUBLESHOOTING
F–215
F
NO.17 COOLING SYSTEM CONCERNS-OVERHEATING
A6E398018881W19
Diagnostic procedure
17
COOLING SYSTEM CONCERNS -OVERHEATING
DESCRIPTION
Engine runs at higher than normal temperature/overheats.
POSSIBLE CAUSE
• Improper coolant level
• Blown fuses
• Coolant leakage
• Excessive A/C system pressure
• A/C system operation is improper
• Improper water/anti-freeze mixture
• Fans reverse rotation
• Poor radiator condition
• Thermostat malfunction
• Radiator hoses damage
• Condenser fan is inoperative.
• Improper or damaged radiator cap
• Cooling fan is inoperative.
• Coolant overflow system malfunction
• Improper tension of drive belt
• Drive belt damage
STEP
INSPECTION
RESULTS
ACTION
1
Inspect following:
• Engine coolant level
• Coolant leakage
• Water and anti-freeze mixture
• Radiator condition
• Collapsed or restricted radiator hoses
• Radiator pressure cap
• Overflow system
• Fan rotational direction
• Fuses
Are all items okay?
Yes
Go to next step.
No
Service as necessary.
Repeat Step 1.
2
Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and
KOER DTCs.
Are there any DTCs displayed?
Yes
DTC is displayed:
Go to appropriate DTC test.
No
No DTC is displayed:
Go to next step.
3
Start engine and run it at idle speed.
Turn A/C switch on.
Does A/C compressor engage?
Yes
Go to Step 5.
No
Inspect for following and repair or replace as
necessary:
• Refrigerant charging amount
• Open circuit between A/C relay and PCM terminal
4O
• Seized A/C magnetic clutch
• A/C magnetic clutch malfunction
If all items are okay, go to next step.
4
Connect WDS or equivalent to DLC-2.
Access ACSW PID.
Start engine and run it at idle speed.
Turn A/C switch on.
Does ACSW PID read ON?
Yes
Go to next step.
No
Inspect following:
• Refrigerant pressure switch operation
• A/C switch is stuck open.
• Open or short circuit between refrigerant pressure
switch and PCM terminal 1AC
• Open circuit of blower motor fan switch and resistor
(if blower motor does not operate)
• Evaporator temperature sensor and A/C amplifier
5
Inspect cooling fan control system operation.
(See
F–234 Cooling Fan Control System
Does cooling fan control system work properly?
Yes
Go to next step.
No
Repair or replace malfunctioning parts.
6
Is drive belt okay?
Yes
Go to next step.
No
Replace drive belt.
7
Is there any leakage around heater unit in
passenger compartment?
Yes
Inspect and service heater for leakage.
No
Go to next step.
8
Is there any leakage at coolant hoses and/or
radiator?
Yes
Replace malfunctioning part.
No
Go to next step.
F–216
TROUBLESHOOTING
End Of Sie
NO.18 COOLING SYSTEM CONCERNS-RUNS COLD
A6E398018881W20
Diagnostic procedure
End Of Sie
9
Cool down the engine.
Remove thermostat and inspect operation.
(See
Is thermostat okay?
Yes
Engine coolant temperature and thermostat are okay,
inspect engine block for leakage or blockage.
No
Access ECT PID.
Inspect for both ECT PID and temperature gauge
readings.
If temperature gauge on instrument cluster indicates
normal range but ECT PID is not same as temperature
gauge reading, inspect ECT sensor.
If temperature gauge on instrument cluster indicates
overheating but ECT PID is normal, inspect
temperature gauge and heat gauge unit.
10
Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.
STEP
INSPECTION
RESULTS
ACTION
18
COOLING SYSTEM CONCERNS -RUNS COLD
DESCRIPTION
Engine takes excessive period for reaching normal operating temperature.
POSSIBLE CAUSE
• Thermostat malfunction
• Condenser fan system malfunction
• Cooling fan system malfunction
STEP
INSPECTION
RESULTS
ACTION
1
Is customer complaint "Lack of passenger
compartment heat" only?
Yes
Inspect A/C and heater system.
No
Go to next step.
2
Does engine speed continue at fast idle?
Yes
Go to symptom troubleshooting "No.9 Fast idle/runs
on".
No
Go to next step.
3
Remove thermostat and inspect operation.
(See
Is thermostat okay?
Yes
Go to next step.
No
Replace thermostat.
4
Inspect cooling fan control system operation.
(See
F–234 Cooling Fan Control System
Does cooling fan control system work properly?
Yes
Access ECT PID.
Inspect for both ECT PID and temperature gauge on
instrment cluster readings.
If temperature gauge on instrument cluster indicates
normal range but ECT PID is not same as temperature
gauge reading, inspect ECT sensor.
If temperature gauge on instrument cluster indicates
cold range but ECT PID is normal, inspect temperature
gauge and heat gauge unit.
No
Repair or replace malfunctioning part.
5
Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.
TROUBLESHOOTING
F–217
F
NO.19 EXHAUST SMOKE
A6E398018881W21
Diagnostic procedure
19
EXHAUST SMOKE
DESCRIPTION
Blue, black, or white smoke from exhaust system
POSSIBLE CAUSE
Blue smoke (Burning oil):
• PCV valve malfunction
• Engine internal oil leakage
White smoke (Water in combustion):
• Cooling system malfunction (coolant loss)
• Engine internal coolant leakage
Black smoke (Rich fuel mixture):
• Air cleaner restriction
• Intake-air system is collapsed or restricted.
• Fuel return line is restricted.
• Excessive fuel pressure
• Improper engine compression
• Injector fuel leakage
• Ignition system malfunction
Warning
The following troubleshooting flow chart contains fuel system diagnosis and repair
procedures. Read following warnings before performing 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 injuries or
death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete
“BEFORE REPAIR PROCEDURE” and “AFTER REPAIR PROCEDURE” described in this
manual.
(See
.)
(See
Caution
• Disconnecting/connecting quick release connector without cleaning it may possibly 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 material.
STEP
INSPECTION
RESULTS
ACTION
1
What color is smoke coming from exhaust
system?
Blue
Burning oil is indicated.
Go to next step.
White
Water in combustion is indicated.
Go to Step 3.
Black
Rich fuel mixture is indicated.
Go to Step 4.
2
Remove and shake PCV valve.
Does PCV valve rattle?
Yes
Inspect for following:
• Damaged valve guide, stems or valve seals
• Blocked oil drain passage in cylinder head
• Piston ring is not seated, seized or worn.
• Damaged cylinder bore
If other drivability symptoms are present, return to
diagnostic index to service any additional symptoms.
No
Replace PCV valve.
3
Does cooling system hold pressure?
Yes
Inspect for following:
• Cylinder head gasket leakage
• Intake manifold gasket leakage
• Cracked or porous engine block
If other drivability symptoms are present, return to
diagnostic index to service any additional symptoms.
No
Inspect for cause.
4
Inspect for following:
• Air cleaner restriction
• Collapsed or restricted intake-air system
• Restricted fuel return line
Are all items okay?
Yes
Go to next step.
No
Service as necessary.
Repeat Step 4.
5
Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and
KOER DTCs.
Are there any DTCs displayed?
Yes
DTC is displayed:
Go to appropriate DTC test.
No
No DTC is displayed:
Go to next step.
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