Mazda Protege 5. Manual — part 95
SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (ZM)]
01–03A–33
01–03A
4
•
Connect WDS or equivalent to DLC-2.
•
Access RPM PID, MAF PID, TP PID, and
VSS PID.
•
Drive vehicle with monitoring PIDs.
•
Are PIDs within specification?
(See 01–40A–7 PCM Inspection Using the
SST (WDS or equivalent).)
Yes
Go to next step.
No
RPM PID:
•
Inspect CKP sensor and related harness for vibration
and/or intermittent open/short circuit.
MAF PID:
•
Inspect for intermittent open circuit of MAF sensor and
related wire harness.
TP PID:
•
Inspect if TP sensor output increases smoothly.
VSS PID:
•
Inspect for intermittent open circuit of VSS and related
wire harness.
5
•
Visually inspect CKP sensor and teeth of
crankshaft pulley.
•
Are CKP sensor and teeth of crankshaft
pulley okay?
Yes
Go to next step.
No
Replace malfunctioning parts.
6
•
Measure gap between CKP sensor and teeth
of crankshaft pulley.
Gap
0.5—1.5 mm {0.020—0.059 in}
•
Is the gap within specification?
Yes
Go to next step.
No
Adjust CKP sensor.
7
•
Inspect condition of spark plugs.
•
Is spark plug wet, covered with carbon or
grayish white?
Yes
Spark plug is wet or covered with carbon:
•
Inspect for fuel leakage from fuel injector.
Spark plug is grayish white:
•
Inspect for clogged fuel injector.
No
Install spark plugs on original cylinders.
Go to next step.
8
•
Remove and shake PCV valve.
•
Does PCV valve rattle?
Yes
Go to next step.
No
Replace PCV valve.
9
•
Is there restriction in exhaust system?
Yes
Inspect exhaust system.
No
Go to next step.
10
•
Install fuel pressure gauge between fuel filter
and fuel distributor.
•
Connect jumper wire between F/P terminal at
DLC in engine compartment and GND.
•
Turn ignition switch on.
•
Is fuel line pressure correct with ignition
switch on?
Fuel line pressure
270—310 kPa {2.7—3.2 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.
11
•
Inspect for tumble swirl control system
operation.
(See 01–03A–58 Variable Tumble Control
System (VTCS) Inspection.)
•
Does tumble swirl control system work
properly?
Yes
Go to next step.
No
Repair or replace malfunctioning parts.
12
Note
•
Following test is for engine stalling with A/
C on concern. If other symptoms exist, go
to next step.
•
Connect pressure gauge to A/C low and high
side pressure lines.
•
Turn A/C on and measure low side and high
side pressure.
•
Are pressure within specifications?
(See 07–10–3 REFRIGERANT PRESSURE
CHECK.)
Yes
Go to next step.
No
If A/C is always on, go to symptom troubleshooting “NO.24
A/C IS ALWAYS ON/ A/C COMPRESSOR RUNS
CONTINUOUSLY [ZM]”.
For other symptoms, inspect following:
•
Refrigerant charging amount
•
Condenser fan operation
STEP
INSPECTION
ACTION
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SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (ZM)]
01–03A–34
End Of Sie
NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE [ZM]
A3U010318881W55
Diagnostic procedure
13
•
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 sticks open mechanically.
Inspect evaporative emission control system.
No
Go to next step.
14
•
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.
15
•
Inspect EGR valve.
•
Is EGR valve okay?
Yes
Go to next step.
No
Replace malfunctioning parts.
16
•
Is engine compression correct?
Yes
Inspect following:
•
Valve timing
•
Internal transaxle components (ATX)
•
Clutch (MTX)
•
Brake system for dragging
No
Inspect for cause.
17
•
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
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 flowchart 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
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 switch on.
•
Retrieve any DTC.
•
Is “DTC” displayed?
Yes
DTC is displayed:
•
Go to appropriate DTC test.
No
No DTC is displayed:
•
Go to next step.
3
•
Is engine compression correct?
Yes
Go to next step.
No
Inspect for cause.
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SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (ZM)]
01–03A–35
01–03A
End Of Sie
NO.14 POOR FUEL ECONOMY [ZM]
A3U010318881W56
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
, 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.
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
ACTION
14
Poor fuel economy
DESCRIPTION
•
Fuel economy is unsatisfactory.
POSSIBLE
CAUSE
•
Contaminated air cleaner element
•
Tumble swirl control system malfunction
•
Engine cooling system malfunction
•
Improper ATX 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 flowchart 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
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 switch on.
•
Retrieve any DTC.
•
Is “DTC” displayed?
Yes
DTC is displayed:
•
Go to appropriate DTC test.
No
No DTC is displayed:
•
Go to next step.
3
•
Access ECT PID.
•
Drive vehicle while monitoring PID.
(See 01–40A–7 PCM Inspection Using the
SST (WDS or equivalent).)
•
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(01-03A).fm 35 ページ 2001年6月29日 金曜日 午後4時45分
SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (ZM)]
01–03A–36
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
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 tumble swirl control system
operation.
(See 01–03A–58 Variable Tumble Control
System (VTCS) Inspection.)
•
Does tumble swirl control system work
properly?
Yes
Go to next step.
No
Repair or replace malfunctioning parts.
7
•
Remove and shake PCV valve.
•
Does PCV valve rattle?
Yes
Go to next step.
No
Replace PCV valve.
8
•
Is there any restriction in exhaust system?
Yes
Inspect exhaust system.
No
Go to next step.
9
•
Is brake system functioning properly?
Yes
Go to next step.
No
Inspect for cause.
10
•
Inspect for contaminated MAF sensor.
•
Is there any contamination?
Yes
Replace MAF sensor.
No
Go to next step.
11
•
Is engine compression correct?
Yes
Inspect valve timing.
No
Inspect for cause.
12
•
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
ACTION
1712-1U-01G(01-03A).fm 36 ページ 2001年6月29日 金曜日 午後4時45分
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