Mazda Protege 5. Manual — part 111
SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (FS)]
01–03B–37
01–03B
End Of Sie
NO.16 HIGH OIL CONSUMPTION/LEAKAGE [FS]
A3U010318881W21
Diagnostic procedure
End Of Sie
6
•
Install fuel pressure gauge between fuel filter
and fuel distributor.
•
Start engine and run it at idle.
•
Measure fuel line pressure at idle.
•
Is fuel line pressure correct at idle?
Fuel line pressure
210—250 kPa {2.1—2.6 kgf/cm
2
, 30—36 psi}
Yes
Go to next step.
No
Zero or low:
•
Inspect fuel pump circuit.
•
Inspect for open fuel pump relief valve.
•
Inspect for fuel leakage inside pressure regulator.
•
Inspect for clogged main fuel line.
High:
•
Inspect pressure regulator for high pressure cause.
•
Inspect for clogged fuel return line.
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 any restriction in exhaust system?
Yes
Inspect exhaust system.
No
Inspect EGR valve.
10
•
Verify test results.
— If okay, return to diagnostic index to service any additional symptoms.
— If malfunction remains, refer to related Service Bulletins and perform repair or diagnosis.
•
If vehicle is repaired, troubleshooting completed.
•
If vehicle is not repaired or additional diagnostic information is not available, 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, refer to related Service Bulletins and perform repair or diagnosis.
•
If vehicle is repaired, troubleshooting completed.
•
If vehicle is not repaired or additional diagnostic information is not available, replace PCM.
1712-1U-01G(01-03B).fm 37 ページ ２００１年６月２９日 金曜日 午前９時３３分
SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (FS)]
01–03B–38
NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [FS]
A3U010318881W22
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
•
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 for 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.
•
Turn ignition key to ON.
•
Retrieve any DTC.
•
Is “DTC” displayed?
Yes
DTC displayed:
•
Go to appropriate DTC test.
No
No DTC 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 next step.
No
Inspect for following and repair or replace as
necessary:
•
Refrigerant charging amount
•
Open circuit between A/C relay and PCM terminal
96
•
Seized A/C magnetic clutch
•
A/C magnetic clutch malfunction
If all items are okay, inspect following:
•
Refrigerant pressure switch operation
•
Evaporator temperature sensor and A/C amplifier
•
A/C switch is stuck open.
•
Open or short circuit between refrigerant pressure
switch and PCM terminal 41
•
Open circuit of blower motor fan switch and resistor
(if blower motor does not operate)
1712-1U-01G(01-03B).fm 38 ページ ２００１年６月２９日 金曜日 午前９時３３分
SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (FS)]
01–03B–39
01–03B
End Of Sie
4
•
Start engine and run it at idle speed.
•
Turn A/C switch on.
•
Do cooling fan and condenser fan operate?
Yes
Go to next step.
No
Cooling fan motor does not operate:
•
Inspect for following:
— Cooling fan relay is stuck open.
— Cooling fan motor malfunction
— Cooling fan motor GND open
— Open circuit between cooling fan motor and
relay
— Open circuit between cooling fan relay and PCM
terminal 47
— Open battery power circuit for cooing fan relay
Condenser fan motor does not operate:
•
Inspect for following:
— Condenser fan relay is stuck open.
— Condenser fan motor malfunction
— Condenser fan motor GND open
— Open circuit between condenser fan motor and
relay
— Open circuit between condenser fan relay and
PCM terminal 45
— Open battery power circuit for condenser fan
relay
5
•
Is drive belt okay?
Yes
Go to next step.
No
Replace drive belt.
6
•
Is there any leakage around heater unit in
passenger compartment?
Yes
Inspect and service heater for leakage.
No
Go to next step.
7
•
Is there any leakage at coolant hoses and/or
radiator?
Yes
Replace malfunctioning part.
No
Go to next step.
8
•
Cool down the engine.
•
Remove thermostat and inspect operation.
(See 01–12–5 THERMOSTAT REMOVAL/
INSTALLATION.)
(See 01–12–7 THERMOSTAT
INSPECTION.)
•
Is thermostat okay?
Yes
Engine coolant temperature and thermostat are okay.
Inspect engine block for leakage or blockage.
No
Access ECT PID on WDS or equivalent.
Inspect for both ECT and temperature gauge readings.
•
If temperature gauge on instrument cluster
indicates normal range but ECT is not same as
temperature gauge reading, inspect ECT sensor.
•
If temperature gauge on instrument cluster
indicates overheating but ECT is normal, inspect
temperature gauge and heat gauge unit.
9
•
Verify test results.
— If okay, return to diagnostic index to service any additional symptoms.
— If malfunction remains, refer to related Service Bulletins and perform repair or diagnosis.
•
If vehicle is repaired, troubleshooting completed.
•
If vehicle is not repaired or additional diagnostic information is not available, replace PCM.
STEP
INSPECTION
RESULTS
ACTION
1712-1U-01G(01-03B).fm 39 ページ ２００１年６月２９日 金曜日 午前９時３３分
SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (FS)]
01–03B–40
NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [FS]
A3U010318881W23
Diagnostic procedure
End Of Sie
18
Cooling system concerns — Runs cold
DESCRIPTION
•
Engine does not reach 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 [FS].”
No
Go to next step.
3
•
Remove thermostat and inspect operation.
(See 01–12–5 THERMOSTAT REMOVAL/
INSTALLATION.)
(See 01–12–7 THERMOSTAT
INSPECTION.)
•
Is thermostat okay?
Yes
Inspect cooling fan and condenser fan operation.
•
If both or either fan operate abnormally, inspect for
following:
— Cooling fan relay is stuck closed.
— Condenser fan relay is stuck closed.
— Short to GND between cooling fan relay and
PCM terminal 47
— Short to GND between condenser fan relay and
PCM terminal 45
— Circuit between cooling fan relay and fan motor
shorts to battery supply line
— Circuit between condenser fan relay and fan
motor shorts to battery supply line
No
Access ECT PID on WDS or equivalent.
Inspect both ECT and temperature gauge on
instrument cluster readings.
•
If temperature gauge on instrument cluster
indicates normal range but ECT is not same as
temperature gauge reading, inspect ECT sensor.
•
If temperature gauge on instrument cluster
indicates cold range but ECT is normal, inspect
temperature gauge and heat gauge unit.
4
•
Verify test results.
— If okay, return to diagnostic index to service any additional symptoms.
— If malfunction remains, refer to related Service Bulletins and perform repair or diagnosis.
•
If vehicle is repaired, troubleshooting completed.
•
If vehicle is not repaired or additional diagnostic information is not available, replace PCM.
1712-1U-01G(01-03B).fm 40 ページ ２００１年６月２９日 金曜日 午前９時３３分
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