Mazda Protege 5. Manual — part 26

ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (ZM)]

01–02A–70

End Of Sie

DTC P0402 [ZM]

A3U010201086W17

Diagnostic procedure

9

MONITOR EGR SYSTEM BY DRIVE MODE

•

Make sure to reconnect all disconnected
connectors.

•

Run OBD-II Drive Mode 1 and 2.
(See 01–02A–11 OBD-II DRIVE MODE [ZM].)

•

Check EGR System Monitor completion status
using On-Board Readiness Test function.

•

Has EGR system been monitored?

Yes Go to next step.

No

Retry this step.

10

VERIFY TROUBLESHOOTING OF DTC P0401
COMPLETED

•

Access DIAGNOSTIC MONITORING TEST
RESULTS.

•

Verify TEST ID 10:41:00 value.

•

Is value within specification?

Yes Go to next step.

No

Replace PCM, then go to next step.

11

VERIFY AFTER REPAIR PROCEDURE

•

Perform “After Repair Procedure”.
(See 01–02A–10 AFTER REPAIR
PROCEDURE [ZM].)

•

Is there any DTC present?

Yes Go to applicable DTC inspection.

(See 01–02A–15 DTC TABLE [ZM].)

No

Troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P0402

EGR flow excessive detected

DETECTION

CONDITION

•

Difference in intake manifold pressures when EGR is operated and when it is stopped is too large.

Diagnostic support note

•

This is an intermittent monitor (EGR).

•

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

•

EGR valve gasket is not installed.

•

EGR valve gasket has been damaged.

•

PCM 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

INSPECT FOR OTHER DTCS

•

Turn ignition key to OFF then start engine.

•

Have other DTCs been stored?

Yes Go to applicable DTC troubleshooting.

No

Go to next step.

4

INSPECT EGR VALVE GASKET

•

Turn ignition key to OFF.

•

Remove EGR valve.

•

Is EGR valve gasket installed?

Yes Go to next step.

No

Install EGR valve gasket, then go to Step 6.

5

INSPECT EGR VALVE GASKET MALFUNCTION

•

Does EGR valve gasket have any crack and/or
damage?

Yes Replace EGR valve gasket, then go to Step 6.

No

Go to next step.

6

MONITOR EGR SYSTEM BY DRIVE MODE

•

Make sure to reconnect all disconnected
connectors.

•

Run OBD-II Drive Mode 1 and 2.
(See 01–02A–11 OBD-II DRIVE MODE [ZM].)

•

Check EGR System Monitor completion status
using On-Board Readiness Test function.

•

Has EGR system been monitored?

Yes Go to next step.

No

Retry this step.

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ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (ZM)]

01–02A–71

01–02A

End Of Sie

DTC P0421 [ZM]

A3U010201086W18

Diagnostic procedure

7

VERIFY TROUBLESHOOTING OF DTC P0402
COMPLETED

•

Make sure to reconnect all disconnected
connectors.

•

Access DIAGNOSTIC MONITORING TEST
RESULTS.

•

Verify TEST ID 10:41:00 value.

•

Is value within specification?

Yes Go to next step.

No

Replace PCM, then go to next step.

8

VERIFY AFTER REPAIR PROCEDURE

•

Perform “After Repair Procedure”.
(See 01–02A–10 AFTER REPAIR
PROCEDURE [ZM].)

•

Is there any DTC present?

Yes Go to applicable DTC inspection.

(See 01–02A–15 DTC TABLE [ZM].)

No

Troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P0421

Warm-up catalyst system efficiency below threshold

DETECTION

CONDITION

•

PCM compares the number of HO2S (front) and HO2S (rear) inversions for a predetermined time. PCM
monitors the number of inversions the rear side performs while the front side inverts for a specified number
of times when the following monitoring conditions are met. PCM detects the inversion ratio. If inversion
ratio is below threshold, PCM determines that catalyst system has deteriorated.

MONITORING CONDITIONS

— Engine speed is 1,500—3,000 rpm.
— Calculated load is 17—48%(*

1

).

— Vehicle speed is 28—120 km/h {17.3—74.5 mph}.

*

1

: Maximum calculated load value varies depending on engine speed.

Diagnostic support note

•

This is an intermittent monitor. (CATALYST)

•

MIL illuminates if PCM detects the above malfunction conditions in two consecutive drive cycles.

•

DIAGNOSTIC MONITORING TEST RESULTS are available.

•

PENDING CODE is stored if PCM detects the above malfunction condition during first drive cycle.

•

FREEZE FRAME DATA is available.

•

DTC is stored in PCM memory.

POSSIBLE

CAUSE

•

WU-TWC deterioration or malfunction

•

Exhaust gas leakage

•

Looseness of HO2S (front)

•

Looseness of HO2S (rear)

•

HO2S (front) 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.

No

Go to next step.

4

INSPECT EXHAUST SYSTEM FOR GAS
LEAKAGE

•

Visually inspect exhaust gas leakage in
exhaust system.

•

Is there any gas leakage?

Yes Repair or replace faulty exhaust parts, then go to Step 7.

No

Go to next step.

5

INSPECT INSTALLATION OF FRONT AND
REAR OXYGEN SENSORS

•

Inspect for looseness of front and rear oxygen
sensors.

•

Is it okay?

Yes Go to next step.

No

Retighten sensor, then go to Step 7.

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ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (ZM)]

01–02A–72

End Of Sie

DTC P0442 [ZM]

A3U010201086W19

6

INSPECT WU-TWC

•

Clear DTC using WDS or equivalent.

•

Inspect WU-TWC.
(See 01–16–19 WARM UP THREE-WAY
CATALYTIC CONVERTER (WU-TWC)
INSPECTION.)

•

Is WU-TWC okay?

Yes Replace suspected oxygen sensor, then go to next step.

No

Replace WU-TWC, then go to next step.

7

VERIFY TROUBLESHOOTING OF DTC P0421
COMPLETED

•

Make sure to reconnect all disconnected
connectors.

•

Turn ignition key to ON (Engine OFF).

•

Clear DTC from memory using WDS or
equivalent.

•

Start engine and perform OBD-II DRIVE
MODE except for MODE 4.
(See 01–02A–11 OBD-II DRIVE MODE [ZM].)

•

Is PENDING CODE of same DTC present?

Yes Replace PCM, then go to next step.

No

Go to next step.

8

VERIFY AFTER REPAIR PROCEDURE

•

Perform “After Repair Procedure”.
(See 01–02A–10 AFTER REPAIR
PROCEDURE [ZM].)

•

Is there any DTC present?

Yes Go to applicable DTC inspection.

(See 01–02A–15 DTC TABLE [ZM].)

No

Troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P0442

Evaporative emission control system leak detected (small leak)

DETECTION

CONDITION

•

PCM measures the fuel tank pressure (ftp2), which is the vacuum when a specified period has passed after
EVAP system is sealed. PCM determines the pressure difference between ftp1 and ftp2. If pressure
difference exceeds the threshold, PCM determines that the EVAP system has a small leak. This monitor
can activate when the PCM determines that the CONSTANTLY LEAK DETECTED test results are passed.

THRESHOLD VALUE

— Fuel tank pressure (ftp2—ftp1): 1.17—3.91 kPa {8.78—29.30 mmHg, 0.34—1.15 inHg}

•

Threshold valve varies depends on ECT at engine start BARO.

MONITORING CONDITIONS

— PCM monitors EVAP system when driving under following conditions:

•

Remaining fuel: 15—85%

•

ECT at engine start: –10.0

°°°°

C—32.5

°°°°

C {14.0—90.5

°°°°

F}

•

Atmospheric pressure: above 72.2 kPa {542 mmHg, 21.3 inHg}

•

Vehicle speed: 39.5—120.3 km/h {24.5—74.7 mph}

•

Engine speed: 1,000—4,000 rpm

•

Calculated load: 9—65%

•

Throttle opening angle: 3.1—12.5%

•

IAT during monitor: –10—60

°°°°

C {14—140

°°°°

F}

Diagnostic support note

•

This is an intermittent monitor (Evaporative leak monitor).

•

MIL illuminates if PCM detects the above malfunction condition in two consecutive drive cycles.

•

DIAGNOSTIC MONITORING TEST RESULTS and PENDING CODE are stored if PCM detects the above
malfunction condition during first drive cycle.

•

FREEZE FRAME DATA is available.

•

DTC is stored in PCM memory.

POSSIBLE

CAUSE

•

Purge solenoid valve malfunction

•

Canister drain cut valve (CDCV) malfunction

•

Tank pressure control valve (TPCV) malfunction

•

Pressure control valve malfunction

•

Loose or defective fuel filler cap

•

Charcoal canister malfunction

•

Catch tank malfunction

•

Rollover valve malfunction

•

Cracked fuel tank

•

Fuel tank component parts poorly installed

•

EVAP hose damaged or loose

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ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (ZM)]

01–02A–73

01–02A

Diagnostic procedure

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 ON (Engine
OFF).

•

Verify related pending code or stored DTCs.

•

Are DTCs P0443 and/or P1449 present?

Yes Go to appropriate DTC inspection.

No

Go to next step.

4

INSPECT FUEL-FILLER CAP

•

Verify fuel-filler cap is neither loose nor
damaged.

•

Is it okay?

Note

•

When fuel-filler caps other than OEM
caps are attached, it is considered a
malfunction.

Yes Go to next step.

No

Retighten fuel-filler cap or replace it if it is damaged.
Then go to Step 15.

5

INSPECT WHOLE EVAP CONTROL SYSTEM

•

Implement “01-03B ENGINE CONTROL
SYSTEM OPERATION INSPECTION [FS],
Evaporative System Leak Inspection Using
Vacuum Pump, Whole system inspection”.
(See 01–03B–55 Whole system inspection.)

•

Does voltage change under to specified
readings and hold for minimum of 2 minutes?

Yes No leaks were detected in EVAP control system at this

time.
Go to Step 15.

No

If evaporative emission tester is available, go to Step 14.
If not, go to next step.

6

INSPECT FOR LEAKAGE FROM CHARCOAL
CANISTER TO FUEL TANK

•

Implement “01-03B ENGINE CONTROL
SYSTEM OPERATION INSPECTION [FS],
Evaporative System Leak Inspection Using
Vacuum Pump, Inspection from charcoal
canister to fuel tank”.
(See 01–03B–55 Inspection from charcoal
canister to fuel tank.)

•

Does voltage change under to specified
readings and hold for a minimum of 2
minutes?

Yes Go to Step 9.

No

Go to next step.

7

INSPECT ATTACHED ACCESSORIES ON FUEL
TANK

•

Remove fuel tank and visually inspect for
damage, insufficient sealing or poorly attached
accessories on fuel tank, such as fuel gauge.

•

Is it okay?

Yes Go to next step.

No

Repair or replace fuel tank or sealing, then go to Step 15.

8

INSPECT ROLLOVER VALVE

•

Remove rollover valve and inspect for damage.

•

Is it okay?

Yes Inspect for detached, incorrectly installed or cracked hoses

on fuel tank and from charcoal canister to fuel tank. Repair
or replace as necessary. Then go to step 15.

No

Replace rollover valve, then go to Step 15.

9

INSPECT LEAKAGE BETWEEN CHARCOAL
CANISTER AND PURGE SOLENOID VALVE

•

Implement “01-03B ENGINE CONTROL
SYSTEM OPERATION INSPECTION [FS],
Evaporative System Leak Inspection Using
Vacuum Pump, Inspection from charcoal
canister to purge solenoid valve”.
(See 01–03B–55 Inspection from charcoal
canister to purge solenoid valve.)

•

Does voltage change under to specified
readings and hold for a minimum of 2
minutes?

Yes Go to Step 15.

No

Go to next step.

1712-1U-01G(01-02A).fm 73 ページ ２００１年６月２９日 金曜日 午後２時２０分