Mazda Protege 5. Manual — part 62
ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (FS)]
01–02B–68
7
VERIFY CURRENT INPUT SIGNAL STATUS OF
HO2S FRONT
•
Access O2S11 PID using WDS or equivalent.
•
Check PID under following accelerator pedal
condition. (in PARK)
— More than 0.45 V when suddenly
depressing accelerator pedal (rich
condition)
— Less than 0.45 V just after release of
accelerator pedal (lean condition)
•
Is PID reading okay?
Yes Inspect following for air suction due to cracks, damages
and loose parts:
•
From air cleaner to throttle body
•
From throttle body to dynamic chamber
•
From dynamic chamber to intake manifold
•
Vacuum hoses
Note
•
Engine speed may change when rust penetrating
agent is sprayed on the air suction area.
Repair or replace any faulty part, then go to Step 20.
No
Visually inspect for any gas leakage between exhaust
manifold and HO2S (front).
•
If there is no leakage, replace HO2S (front).
Then go to Step 20.
8
INSPECT MAF SIGNAL
•
Start engine.
•
Access MAF PID using WDS or equivalent.
•
Verify that MAF PID changes quickly according
to race engine RPM.
•
Is MAF PID response okay?
Yes Go to next step.
No
Replace MAF sensor, then go to Step 20.
9
INSPECT FOR EXCESSIVE AIR SUCTION OF
INTAKE-AIR SYSTEM
•
Visually inspect for loose, cracked or damaged
hoses on intake-air system.
•
Is there malfunction?
Yes Repair or replace source of air suction, then go to Step 20.
No
Go to next step.
10
INSPECT FUEL LINE PRESSURE
•
Turn ignition key to OFF.
Note
•
If engine will not start, inspect fuel line
pressure with ignition key ON.
•
Inspect fuel line pressure while engine running.
(See 01–14–6 FUEL PRESSURE
INSPECTION.)
•
Is fuel line pressure within 210—250 kPa
{2.1—2.6 kgf/cm
2
, 30—36 psi}?
Yes Go to Step 14.
No
If fuel line pressure is too high: Go to next step.
If fuel line pressure is too low: Go to Step 12.
11
VERIFY VACUUM IS LEADING TO PRESSURE
REGULATOR
•
Disconnect vacuum hose from pressure
regulator.
•
Verify that vacuum is felt at opening port of
disconnected vacuum hose.
•
Is vacuum felt?
Yes Inspect fuel pump maximum pressure and fuel return hose
for clogging.
•
If any problem is found, repair or replace suspected
parts.
•
If all items above are okay, replace pressure regulator.
Then go to Step 20.
No
Verify vacuum hoses are connected correctly.
•
If okay, replace PRC solenoid valve, then go to Step 20.
•
If not, reconnect vacuum hoses to correct position, then
go to Step 20.
12
INSPECT FUEL PUMP MAXIMUM PRESSURE
•
Perform fuel pump maximum pressure test.
(See 01–14–15 FUEL PUMP UNIT
INSPECTION.)
•
Is fuel pump maximum pressure within 450—
630 kPa {4.5—6.5 kgf/cm
2
, 64—92 psi}?
Yes Go to next step.
No
Inspect fuel pump circuit for open or poor connection.
Repair or replace suspected circuit, then go to Step 20.
•
If circuit is okay, replace fuel pump. Then go to Step 20.
STEP
INSPECTION
ACTION
1712-1U-01G(01-02B).fm 68 ページ 2001年6月29日 金曜日 午後3時24分
ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (FS)]
01–02B–69
01–02B
End Of Sie
13
INSPECT FUEL LINE FROM FUEL PUMP TO
FUEL DELIVERY PIPE
•
Visually inspect fuel line for any leakage.
•
Is any fuel leakage found?
Yes Replace suspected fuel line, then go to Step 20.
No
Inspect fuel filters for following:
•
Restriction or clogging at fuel filter (high-pressure).
•
Foreign materials or stain inside fuel filter (low-
pressure)
Perform following actions as result.
•
If restriction or clogging is found at fuel filter (high-
pressure), replace fuel filter (high-pressure).
•
If foreign materials or stain is found inside fuel filter
(low-pressure), clean of fuel tank and fuel filter (low-
pressure).
•
If all items above are okay, replace pressure regulator.
Then go to Step 20.
14
CHECK IGNITION COIL OPERATION AND
HIGH-TENSION LEAD WITH TIMING LIGHT
•
Verify blinking condition on each cylinders
using timing light at idle.
•
Do all cylinders show blinking condition?
Yes Go to Step 18.
No
Go to next step.
15
CHECK HIGH-TENSION LEADS OF NO
BLINKING CYLINDER
•
Turn ignition key to OFF.
•
Inspect high-tension leads for installation
condition, corrosion on terminal, open lead and
damaged cover.
•
Is condition of high-tension lead okay?
Yes Go to next step.
No
Replace faulty high-tension lead, then go to Step 20.
16
INSPECT POWER SUPPLY TERMINAL AT
IGNITION COIL CONNECTOR
•
Disconnect ignition coil connector.
•
Turn ignition key to ON (Engine OFF).
•
Check voltage at ignition coil connector
terminal D (harness-side) and body ground.
•
Is voltage reading B+?
Yes Go to next step.
No
Check for open circuit between ignition coil connector and
ignition switch. Repair or replace wiring harness, then go to
Step 20.
17
INSPECT IGNITION COIL RESISTANCE
•
Check ignition coil resistance.
(See 01–18–2 IGNITION COIL INSPECTION.)
•
Is coil resistance okay?
Yes Go to next step.
No
Replace ignition coil, then go to Step 20.
18
INSPECT ENGINE COMPRESSION
•
Inspect engine compression.
(See 01–10B–8 COMPRESSION
INSPECTION [FS].)
•
Is it okay?
Yes Go to next step.
No
Implement engine overhaul for repairs, then go to Step 20.
19
INSPECT FUEL INJECTOR OPERATION
•
Remove fuel injector from suspected bank.
(See 01–14–24 FUEL INJECTOR
INSPECTION.)
•
Inspect injector operation.
•
Is fuel injector okay?
Yes Go to next step.
No
Replace injector, then go to Step 20.
20
VERIFY TROUBLESHOOTING OF DTC P0171
COMPLETED
•
Make sure to reconnect all disconnected
connectors.
•
Clear DTC from memory using WDS or
equivalent.
•
Run OBD-II DRIVE MODE 1, 2 and 3.
•
Is PENDING CODE P0171 present?
Yes Replace PCM, then go to next step.
No
Go to next step.
21
VERIFY AFTER REPAIR PROCEDURE
•
Perform “After Repair Procedure”.
(See 01–02B–9 AFTER REPAIR
PROCEDURE [FS].)
•
Is there any DTC present?
Yes Go to applicable DTC inspection.
(See 01–02B–15 DTC TABLE [FS].)
No
Troubleshooting completed.
STEP
INSPECTION
ACTION
1712-1U-01G(01-02B).fm 69 ページ 2001年6月29日 金曜日 午後3時24分
ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (FS)]
01–02B–70
DTC P0172 [FS]
A3U010201084W28
Diagnostic procedure
DTC P0172
Fuel trim system (RH) too rich
DETECTION
CONDITION
•
PCM monitors short term fuel trim (SHRTFT) and long term fuel trim (LONGFT) values when DRIVE
MODE 1 is run. If fuel trim exceeds pre programmed criteria, PCM determines that the fuel system is too
rich.
Diagnostic support note
•
This is a continuous monitor. (FUEL SYSTEM)
•
MIL illuminates if PCM detects the above malfunction conditions in two consecutive drive cycles.
•
PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.
•
FREEZE FRAME DATA is available.
•
DTC is stored in PCM memory.
POSSIBLE
CAUSE
•
Misfire
•
HO2S (front) deterioration
•
HO2S heater (front) malfunction
•
PRC solenoid valve malfunction
•
Pressure regulator malfunction
•
Fuel pump malfunction
•
Fuel return hose clogged
•
Purge solenoid valve malfunction
•
Purge solenoid hoses improper connection
•
PCV valve malfunction
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
•
Has FREEZE FRAME DATA been recorded?
Yes Go to next step.
No
Record FREEZE FRAME DATA on repair order, then go to
next step.
2
VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
•
Check for related Service Bulletins availability.
•
Is any related repair information available?
Yes Perform repair or diagnosis according to available repair
information.
•
If vehicle is not repaired, go to next step.
No
Go to next step.
3
VERIFY RELATED PENDING CODE OR
STORED DTCS
•
Turn ignition key to OFF, then start engine.
•
Verify related pending code or stored DTCs.
•
Are other DTCs present?
Yes Go to appropriate DTC troubleshooting procedures.
No
If drivability concern or rough idle is present, go to Step 10.
If not, go to next step.
4
IDENTIFY TRIGGER DTC FOR FREEZE FRAME
DATA
•
Is DTC P0172 on FREEZE FRAME DATA?
Yes Go to next step.
No
Go to troubleshooting procedures for DTC on FREEZE
FRAME DATA.
5
VERIFY CURRENT INPUT SIGNAL STATUS
(IGNITION KEY TO ON/IDLE)
•
Access ECT, MAF, TP and VS PIDs using
WDS or equivalent.
(See 01–40B–8 PID/DATA MONITOR table
(Reference).)
•
Is there any signal that is far out of
specification when ignition key is ON and
engine runs?
Yes Inspect suspected sensor and excessive resistance in
related wiring harnesses. Repair or replace if necessary.
Then go to Step 12.
No
Go to next step.
6
VERIFY CURRENT INPUT SIGNAL STATUS
UNDER TROUBLE CONDITION
•
Inspect same PIDs as in Step 5 while
simulating FREEZE FRAME DATA condition.
•
Is there any input signal which causes drastic
changes?
Yes Inspect suspected sensor and related wiring harnesses,
and repair or replace it. Then go to Step 12.
No
Go to next step.
7
VERIFY CURRENT INPUT SIGNAL STATUS OF
HO2S (FRONT)
•
Access O2S11 PID using WDS or equivalent.
•
Check PID under following accelerator pedal
condition (in PARK or NEUTRAL).
— More than 0.45 V when suddenly
depressing accelerator pedal (rich
condition)
— Less than 0.45 V just after release of
accelerator pedal (lean condition)
•
Is PID reading okay?
Yes Go to next step.
No
Replace suspected HO2S (front).
Then go to Step 12.
1712-1U-01G(01-02B).fm 70 ページ 2001年6月29日 金曜日 午後3時24分
ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (FS)]
01–02B–71
01–02B
End Of Sie
DTC P0300 [FS]
A3U010201085W01
8
INSPECT FUEL LINE PRESSURE
•
Turn ignition key to OFF.
•
Inspect fuel line pressure while engine running.
(See 01–14–6 FUEL PRESSURE
INSPECTION.)
•
Is fuel line pressure within 210—250 kPa
{2.1—2.6 kgf/cm
2
, 30—36 psi}?
Yes Go to Step 10.
No
Go to next step.
9
VERIFY VACUUM IS LEADING TO PRESSURE
REGULATOR
•
Start engine.
•
Disconnect vacuum hose from pressure
regulator.
•
Verify that the vacuum is felt at opening port of
disconnected vacuum hose.
•
Is vacuum felt?
Yes Inspect fuel pump maximum pressure and fuel return hose
for clogging.
•
If any problem found, repair or replace suspected parts.
•
If all items above are okay, replace pressure regulator.
Then go to Step 12.
No
Verify vacuum hoses are connected correctly.
•
If okay, replace PRC solenoid valve, then go to Step 12.
•
If not, reconnect vacuum hoses to correct position, then
go to Step 12.
10
INSPECT PURGE SOLENOID VALVE FOR
WHETHER STUCK OPEN
•
Turn ignition key to OFF.
•
Disconnect both hoses from purge solenoid
valve.
•
Blow air through purge solenoid valve.
•
Does air blow through?
Yes Replace purge solenoid valve.
Then go to Step 12.
No
Go to next step.
11
INSPECT PCV VALVE OPERATION
•
Inspect PCV valve operation.
(See 01–03B–58 Pressure Regulator Control
Inspection.)
•
Is PCV valve okay?
Yes Go to next step.
No
Replace PCV valve, then go to next step.
12
VERIFY TROUBLESHOOTING OF DTC P0172
COMPLETED
•
Make sure to reconnect all disconnected
connectors.
•
Turn ignition key to ON (Engine OFF).
•
Clear DTC from memory using WDS or
equivalent.
•
Run OBD-II DRIVE MODE 1, 2 and 3.
•
Is PENDING CODE of same DTC present?
Yes Replace PCM, then go to next step.
No
Go to next step.
13
VERIFY AFTER REPAIR PROCEDURE
•
Perform “After Repair Procedure”.
(See 01–02B–9 AFTER REPAIR
PROCEDURE [FS].)
•
Is there any DTC present?
Yes Go to applicable DTC inspection.
(See 01–02B–15 DTC TABLE [FS].)
No
Troubleshooting completed.
STEP
INSPECTION
ACTION
DTC P0300
Random misfire detection
DETECTION
CONDITION
•
PCM monitors CKP sensor input signal interval time. PCM calculates the change of the interval time for
each cylinder. If the change of interval time exceeds the preprogrammed criteria, PCM detects a misfire in
the corresponding cylinder. While the engine is running, PCM counts the number of misfires that occurred
at 200 crankshaft revolutions and 1,000 crankshaft revolutions and calculates misfire ratio for each
crankshaft revolution. If the ratio exceeds the preprogrammed criteria, PCM determines that a misfire,
which can damage the catalytic converter or affect emission performance, has occurred.
Diagnostic support note
•
This is a continuous monitor (MISFIRE).
•
MIL illuminates if PCM detects the misfire which affects emission performance in two consecutive drive
cycles.
•
PENDING CODE is available if PCM detects the misfire which affects emission performance during first
drive cycle.
•
MIL flashes if PCM detects the misfire which can damage the catalytic converter during first drive cycle.
Therefore, PENDING CODE is not available while MIL flashes.
•
FREEZE FRAME DATA is available.
•
DTC is stored in PCM memory.
1712-1U-01G(01-02B).fm 71 ページ 2001年6月29日 金曜日 午後3時24分
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