Mazda Protege 5. Manual — part 112
SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (FS)]
01–03B–41
01–03B
NO.19 EXHAUST SMOKE [FS]
A3U010318881W24
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 01–14–4 BEFORE REPAIR PROCEDURE.)
(See 01–14–5 AFTER REPAIR PROCEDURE.)
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 rings for 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
•
Engine block cracks or porosity
If other driveability 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.
•
Turn ignition key to ON.
•
Retrieve any DTC.
•
Is “DTC” displayed?
Yes
No DTC displayed:
•
Go to next step.
No
DTC displayed:
•
Go to appropriate DTC test.
1712-1U-01G(01-03B).fm 41 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–42
End Of Sie
NO.20 FUEL ODOR (IN ENGINE COMPARTMENT) [FS]
A3U010318881W25
Diagnostic procedure
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
•
Is strong blue spark visible at each
disconnected high-tension lead while
cranking engine?
Yes
Inspect spark plugs and CMP sensor.
No
Inspect following:
•
High-tension leads
•
Ignition coil and connector
8
•
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
20
Fuel odor (in engine compartment)
DESCRIPTION
•
Gasoline fuel smell or visible leakage
POSSIBLE CAUSE
•
Excessive fuel pressure
•
Purge solenoid valve malfunction
•
Fuel tank vent system blockage
•
Charcoal canister 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 01–14–4 BEFORE REPAIR PROCEDURE.)
(See 01–14–5 AFTER REPAIR PROCEDURE.)
STEP
INSPECTION
RESULTS
ACTION
1
•
Visually inspect for fuel leakage at fuel
injector, O-ring, and fuel line.
•
Service as necessary.
•
Is fuel line pressure held after ignition key is
turned to LOCK?
(See 01–14–28 Operation Inspection.)
Yes
Go to next step.
No
Inspect pressure regulator diaphragm condition.
•
If condition is okay, inspect fuel injector.
•
If condition is not okay, replace pressure regulator.
2
•
Inspect for blockage/restriction or open
between engine vacuum port and charcoal
canister.
•
Inspect for blockage in fuel tank vent system.
•
Is fault indicated?
Yes
Replace vacuum hose.
No
Go to next step.
3
•
Inspect purge solenoid valve.
(See 01–16–12 PURGE SOLENOID VALVE
INSPECTION.)
•
Is solenoid operating properly?
Yes
Go to next step.
No
Replace purge solenoid valve.
4
•
Connect WDS or equivalent to DLC-2.
•
Turn ignition key to ON.
•
Retrieve any DTC.
•
Is “DTC” displayed?
Yes
No DTC displayed:
•
Inspect charcoal canister for fuel saturation.
— If excess amount of liquid fuel is present, replace
charcoal canister.
No
DTC displayed:
•
Go to appropriate DTC test.
1712-1U-01G(01-03B).fm 42 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–43
01–03B
End Of Sie
NO.21 ENGINE NOISE [FS]
A3U010318881W26
Diagnostic procedure
End Of Sie
5
•
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
21
Engine noise
DESCRIPTION
•
Engine noise from under hood or driveline
POSSIBLE CAUSE
Squeal, click or chirp noise:
•
Improper engine oil level
•
Improper drive belt tension
Rattle sound noise:
•
Loose parts
Hiss sound noise:
•
Vacuum leakage
•
Loose spark plug
•
Air leakage from intake-air system
Rumble or grind noise:
•
Improper drive belt tension
Rap or roar sound noise:
•
Exhaust system looseness
Other noise:
•
Camshaft friction gear noise or MLA noise
STEP
INSPECTION
RESULTS
ACTION
1
•
Is squeal, click or chirp sound present?
Yes
Inspect engine oil level or drive belts.
No
Go to next step.
2
•
Is rumble or grind sound present?
Yes
Inspect drive belts.
No
Go to next step.
3
•
Is rattle sound present?
Yes
Inspect location of rattle for loose parts.
No
Go to next step.
4
•
Is hiss sound present?
Yes
Inspect for following:
•
Vacuum leakage
•
Spark plug looseness
•
Intake-air system leakage
No
Go to next step.
5
•
Is rap or roar sound present?
Yes
Inspect exhaust system for loose parts.
No
Go to next step.
6
•
Is knock sound present?
Yes
Go to symptom troubleshooting “NO.13 KNOCKING/
PINGING — ACCELERATION/CRUISE [FS].”
No
If noise comes from engine internal, inspect for friction
gear or MLA noise.
7
•
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 43 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–44
NO.22 VIBRATION CONCERNS (ENGINE) [FS]
A3U010318881W27
Diagnostic procedure
End Of Sie
NO.23 A/C DOES NOT WORK SUFFICIENTLY [FS]
A3U010318881W28
Diagnostic procedure
22
Vibration concerns (engine)
DESCRIPTION
•
Vibration from under hood or driveline
POSSIBLE CAUSE
•
Loose attaching bolts or worn parts
•
Components malfunction such as worn parts
STEP
INSPECTION
RESULTS
ACTION
1
•
Inspect following components for loose
attaching bolts or worn parts:
— Cooling fan
— Drive belt and pulleys
— Engine mounts
•
Are all items okay?
Yes
Inspect following systems:
•
Wheels
•
Automatic transaxle
•
Driveline
•
Suspension
No
Readjust or retighten engine mount installation
position.
Service as necessary for other parts.
2
•
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.
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 A/C relay and A/C magnetic clutch
•
Poor GND of A/C magnetic clutch
•
Refrigerant pressure switch is stuck open.
•
A/C relay is stuck open.
•
Seized A/C compressor
•
Open circuit between A/C switch and PCM through both refrigerant pressure switch and A/C amplifier
STEP
INSPECTION
RESULTS
ACTION
1
•
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.
2
•
Disconnect A/C compressor connector.
•
Start engine and turn A/C switch to ON.
•
Is there correct voltage at terminal of A/C
compressor magnetic clutch connector?
Specification
More than 10.5 V
Yes
Inspect for GND condition of magnetic clutch on A/C
compressor.
If GND condition is okay, inspect for open circuit of
magnetic clutch coil.
No
Go to next step.
3
•
Disconnect refrigerant pressure switch
connector.
•
Connect jumper wires between terminals of
refrigerant pressure switch connector.
•
Turn ignition key to ON.
•
Turn A/C switch on and set blower fan at any
speed.
•
Does A/C work?
Yes
Inspect refrigerant pressure switch operation.
•
If switch is okay, go to next step.
No
Inspect for following:
•
A/C switch is stuck open.
•
Open circuit between refrigerant pressure switch
and PCM terminal 41
•
Open circuit of blower motor fan switch and resistor
(if blower motor does not operate)
•
Evaporator temperature sensor and A/C amplifier
4
•
Remove jumper wires from switch connector.
•
Reconnect connector to refrigerant pressure
switch.
•
Start engine and turn A/C switch on.
•
Does fan operate?
Yes
Inspect for stuck open A/C relay.
Replace as necessary.
No
Inspect following and repair or replace as necessary:
•
Refrigerant charging amount
•
A/C compressor for being seized
1712-1U-01G(01-03B).fm 44 ページ 2001年6月29日 金曜日 午前9時33分
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