Mazda Protege 5. Manual — part 110
SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (FS)]
01–03B–33
01–03B
End Of Sie
NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE [FS]
A3U010318881W18
Diagnostic procedure
14
•
Disconnect vacuum hose between purge
solenoid valve and intake manifold from
purge solenoid valve side.
•
Plug opening end of vacuum hose.
•
Drive vehicle.
•
Does engine condition improve?
Yes
Inspect if purge solenoid valve is stuck open
mechanically.
Inspect evaporative emission control system.
No
Go to next step.
15
•
Visually inspect CMP sensor and projections
of camshaft pulley.
•
Are CMP sensor and projections of camshaft
pulley okay?
Yes
Go to next step.
No
Replace malfunctioning parts.
16
•
Inspect EGR valve.
•
Is EGR valve okay?
Yes
Go to next step.
No
Replace malfunctioning parts.
17
•
Is engine compression correct?
Yes
Inspect following:
•
Valve timing
•
Internal transaxle components (ATX)
•
Clutch (MTX)
•
Brake system for dragging
No
Inspect for cause.
18
•
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
13
Knocking/pinging — Acceleration/cruise
DESCRIPTION
•
Sound is produced when air/fuel mixture is ignited by something other than spark plug (e.g. hot spot
in combustion chamber).
POSSIBLE CAUSE
•
Engine overheating due to cooling system malfunction
•
ECT sensor malfunction
•
IAT sensor malfunction
•
Inadequate engine compression
•
Inadequate fuel pressure
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
•
Connect WDS or equivalent to DLC-2.
•
Access ECT PID.
•
Verify ECT PID is less than 116
°°°°
C {241
°°°°
F}
during driving.
•
Is ECT PID less than specification?
Yes
Go to next step.
No
Inspect cooling system for cause of overheating.
2
•
Connect WDS or equivalent to DLC-2.
•
Turn ignition key on.
•
Retrieve any DTC.
•
Is “DTC” displayed?
Yes
No DTC displayed:
•
Go to next step.
No
DTC displayed:
•
Go to appropriate DTC test.
3
•
Is engine compression correct?
Yes
Go to next step.
No
Inspect for cause.
1712-1U-01G(01-03B).fm 33 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–34
End Of Sie
NO.14 POOR FUEL ECONOMY [FS]
A3U010318881W19
Diagnostic procedure
4
•
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
, 39—45 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.
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
14
Poor fuel economy
DESCRIPTION
•
Fuel economy is unsatisfactory.
POSSIBLE CAUSE
•
Contaminated air cleaner element
•
VICS malfunction
•
Tumble swirl control system malfunction
•
Engine cooling system malfunction
•
Improper automatic transaxle fluid level (ATX)
•
Weak spark
•
Poor fuel quality
•
Erratic or no signal from CMP sensor
•
Improper coolant level
•
Inadequate fuel pressure
•
Spark plug malfunction
•
PCV valve malfunction
•
Brake dragging
•
Improper valve timing due to jumping out of timing belt
•
Contaminated MAF sensor
•
Improper engine compression
•
Exhaust system clogging
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
•
Inspect for following:
— Air cleaner element for contamination
— Automatic transaxle fluid level
— Fuel quality
— Coolant level
•
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
No DTC displayed:
•
Go to next step.
No
DTC displayed:
•
Go to appropriate DTC test.
3
•
Access ECT PID.
•
Drive vehicle while monitoring PID.
•
Is PID within specification?
Yes
Go to next step.
No
Inspect for coolant leakage, cooling fan and condenser
fan operations or thermostat operation.
1712-1U-01G(01-03B).fm 34 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–35
01–03B
End Of Sie
4
•
Is strong blue spark visible at each
disconnected high-tension lead while
cranking engine?
Yes
Inspect for following:
•
Spark plugs malfunction
•
CMP sensor is improperly installed.
•
Trigger wheel damage on camshaft
•
Open or short circuit on CMP sensor
•
Open or short circuit between CMP sensor and
PCM terminal 85 or 86
Repair or replace malfunctioning parts.
If okay, go to next step.
No
Inspect following:
•
High-tension leads
•
Ignition coil and connector
5
•
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.
6
•
Inspect VICS operation.
(See 01–03B–57 VICS Operation
Inspection.)
•
Does VICS work properly?
Yes
Go to next step.
No
Repair or replace malfunctioning parts.
7
•
Inspect tumble swirl control system
operation. (See 01–03B–57 Variable Tumble
Control System (VTCS) Inspection.)
•
Does tumble swirl control system work
properly?
Yes
Go to next step.
No
Repair or replace malfunctioning parts.
8
•
Remove and shake PCV valve.
•
Does PCV valve rattle?
Yes
Go to next step.
No
Replace PCV valve.
9
•
Is there any restriction in exhaust system?
Yes
Inspect exhaust system.
No
Go to next step.
10
•
Is brake system functioning properly?
Yes
Go to next step.
No
Inspect for cause.
11
•
Inspect MAF sensor for contamination.
•
Is there any contamination?
Yes
Replace MAF sensor.
No
Go to next step.
12
•
Is engine compression correct?
Yes
Inspect valve timing.
No
Inspect for cause.
13
•
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 35 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–36
NO.15 EMISSION COMPLIANCE [FS]
A3U010318881W20
Diagnostic procedure
15
Emission compliance
DESCRIPTION
•
Fails emissions test
POSSIBLE CAUSE
•
Vacuum lines leakage or blockage
•
Cooling system malfunction
•
Spark plug malfunction
•
Leakage from intake manifold
•
Erratic or no signal from CMP sensor
•
Inadequate fuel pressure
•
PCV valve malfunction or incorrect valve installation
•
EGR valve malfunction
•
Exhaust system clogging
•
Fuel tank ventilation system malfunction
•
Charcoal canister damage
•
Excessive carbon is built up in combustion chamber.
•
Improper engine compression
•
Improper valve timing
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
•
Inspect for following:
— Vacuum lines for leakage or blockage
— Electrical connections
— Proper maintenance schedule followed
— Intake-air system and air cleaner element
concerns: obstructions, leakage or
dirtiness
•
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
No DTC displayed:
•
Go to next step.
No
DTC displayed:
•
Go to appropriate DTC test.
3
•
Is any other drivability concern present?
Yes
Go to appropriate symptom troubleshooting.
No
Go to next step.
4
•
Connect WDS or equivalent to DLC-2.
•
Access ECT PID.
•
Warm up engine and run it at idle.
•
Verify ECT PID is correct.
•
Is ECT PID correct?
Yes
Go to next step.
No
Inspect for coolant leakage, cooling fan and condenser
fan operation or thermostat operation.
5
•
Is strong blue spark visible at each
disconnected high-tension lead while
cranking engine?
Yes
Inspect for following:
•
Spark plugs malfunction
•
CMP sensor is improperly installed.
•
Damage of trigger wheel on camshaft
•
Open or short circuit on CMP sensor
•
Open or short circuit between CMP sensor and
PCM terminal 85 or 86
Repair or replace malfunctioning parts.
If okay, go to next step.
No
Inspect following:
•
High-tension leads
•
Ignition coil and connector
1712-1U-01G(01-03B).fm 36 ページ 2001年6月29日 金曜日 午前9時33分
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