Mazda Protege 5. Manual — part 113
SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (FS)]
01–03B–45
01–03B
End Of Sie
NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [FS]
A3U010318881W29
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
24
A/C is always on or A/C compressor runs continuously
DESCRIPTION
•
A/C compressor magnetic clutch does not disengage.
POSSIBLE CAUSE
•
Stuck engagement
•
A/C relay is stuck closed.
•
Short to GND between A/C switch and PCM
•
Short to GND circuit between A/C relay and PCM
•
A/C relay to magnetic clutch circuit shorts to battery power
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
•
Start engine and run it at idle.
•
Turn A/C switch on.
•
Remove A/C relay.
•
Does A/C magnetic clutch disengage?
Yes
Inspect for following:
•
A/C relay is stuck closed.
•
Short to GND circuit between A/C relay and PCM
terminal 96
If both items are okay, go to next step.
No
Inspect if circuit between A/C relay and magnetic
clutch shorts to battery power circuit.
•
If circuit is okay, inspect magnetic clutch stuck
engagement or clearance.
3
•
Disconnect refrigerant pressure switch
connector.
•
Start engine and turn A/C switch on.
Note
•
A/C should not work when disconnecting
connector. If A/C remains working, short
to GND circuit may be present.
•
Does A/C reading remain working?
Yes
Inspect for short to GND circuit between refrigerant
pressure switch and PCM terminal 41.
No
Go to next step.
4
•
Reconnect refrigerant pressure switch
connector.
•
Turn off A/C switch.
Note
•
A/C should not work when turning the A/C
switch off. If A/C remains working, short to
GND circuit may be present.
•
Does A/C reading remain working?
Yes
Inspect following:
•
Short to GND circuit between A/C switch and A/C
amplifier
•
Short to GND circuit between A/C amplifier and
refrigerant pressure switch
No
Inspect if A/C switch is stuck closed.
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.
1712-1U-01G(01-03B).fm 45 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–46
NO.25 A/C IS NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS [FS]
A3U010318881W30
Diagnostic procedure
End Of Sie
NO.26 EXHAUST SULPHUR SMELL [FS]
A3U010318881W31
Diagnostic procedure
25
A/C is not cut off under wide open throttle conditions
DESCRIPTION
•
A/C compressor magnetic clutch does not disengage under wide open throttle.
POSSIBLE CAUSE
•
TP sensor malfunction
•
TP sensor misadjustment
•
TP sensor not securely installed
STEP
INSPECTION
RESULTS
ACTION
1
•
Does A/C compressor disengage when A/C
switch is turned off?
Yes
Go to next step.
No
Go to symptom troubleshooting “NO.24 A/C IS
ALWAYS ON OR A/C COMPRESSOR RUNS
CONTINUOUSLY [FS].”
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:
•
Inspect TP sensor for proper adjustment.
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.
26
Exhaust sulphur smell
DESCRIPTION
•
Rotten egg smell (sulphur) from exhaust
POSSIBLE CAUSE
•
Electrical connectors are disconnected or connected poorly
•
Charcoal canister malfunction
•
Vacuum lines are disconnected or connected improperly.
•
Improper 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
•
Are any driveability or exhaust smoke
concerns present?
Yes
Go to appropriate flow chart.
No
Go to next step.
2
•
Inspect following:
— Electrical connections
— Vacuum lines
•
Are all items okay?
Yes
Go to next step.
No
Service as necessary.
Repeat Step 2.
3
•
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.
1712-1U-01G(01-03B).fm 46 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–47
01–03B
End Of Sie
NO.27 FUEL REFILL CONCERNS [FS]
A3U010318881W32
Diagnostic procedure
End Of Sie
4
•
Install fuel pressure gauge between fuel filter
and fuel distributor.
•
Start engine and run it 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
•
Inspect charcoal canister for fuel saturation.
•
Is excess amount of liquid fuel present in
canister?
Yes
Replace charcoal canister.
No
Inspect fuel tank vent system.
•
If fuel tank vent system is okay, since sulfur content
can vary in different fuels, suggest trying a different
brand.
•
If fuel tank vent system is not okay, repair or
replace malfunctioning parts.
6
•
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
27
Fuel refill concerns
DESCRIPTION
•
Fuel tank does not fill smoothly.
POSSIBLE CAUSE
•
Clogged evaporative emission pipes
•
Nonreturn valve malfunction
•
Pressure control valve malfunction
•
Improper use of fuel nozzle
•
Inadequate fuel filling speed
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
•
Retrieve DTCs.
•
Are there any DTCs displayed?
Yes
Go to appropriate DTC test.
No
Go to next step.
2
•
Remove fuel-filler pipe.
•
Make sure nonreturn valve is installed
properly.
•
Inspect nonreturn valve operation.
•
Is nonreturn valve okay?
Yes
Inspect following:
•
Improper use of fuel nozzle
•
Inadequate fuel filling speed
•
Pressure control valve
No
If nonreturn valve is installed improperly:
•
Reinstall nonreturn valve to proper position.
If nonreturn valve does not operate properly:
•
Replace non return valve.
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 47 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–48
NO.28 FUEL FILLING SHUT OFF ISSUES [FS]
A3U010318881W33
Diagnostic procedure
End Of Sie
NO.29 INTERMITTENT CONCERNS [FS]
A3U010318881W34
Diagnostic procedure
28
Fuel filling shut off issues
DESCRIPTION
•
Fuel does not shut off properly.
POSSIBLE CAUSE
•
Clogged evaporative emission pipes
•
Nonreturn valve malfunction
•
Fuel shut-off valve malfunction
•
Fuel nozzle malfunction
•
Fuel nozzle is not inserted correctly.
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
•
Retrieve DTCs.
•
Are there any DTCs displayed?
Yes
Go to appropriate DTC test.
No
Go to next step.
2
•
Remove fuel-filler pipe.
•
Make sure nonreturn valve is installed
properly.
•
Inspect nonreturn valve operation.
•
Is nonreturn valve okay?
Yes
Inspect for following:
•
Improper use of fuel nozzle
•
Fuel nozzle is not inserted correctly.
•
Inspect fuel shut-off valve
No
If nonreturn valve installed improperly:
•
Reinstall nonreturn valve to proper position.
If nonreturn valve does not operate properly:
•
Replace nonreturn valve.
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.
29
Intermittent concerns
DESCRIPTION
•
Symptom occurs randomly and is difficult to diagnose.
STEP
INSPECTION
RESULTS
ACTION
1
•
Talk to customer.
•
Retrieve vehicle service history.
•
Does vehicle have a number of previous
repairs and components replaced for a
certain symptom?
Yes
Go to next step.
No
Go to Symptom Index.
2
•
Connect WDS or equivalent to DLC-2.
•
If input is switch-type component, turn on
manually.
•
Turn ignition key to ON.
•
Access PIDs for suspect component.
•
Lightly tap on suspect component, wiggle
and pull each wire/connector at suspect
component or PCM.
•
Are any PID values out of range, or do they
suddenly change and go back into range?
Yes
Inspect each wire for corrosion, bent or loose terminal
crimps.
No
Go to next step.
1712-1U-01G(01-03B).fm 48 ページ 2001年6月29日 金曜日 午前9時33分
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