Mazda Protege 5. Manual - part 26

 

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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.

1712-1U-01G(01-02A).fm  70 ページ  2001年6月29日 金曜日 午後2時20分

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

1712-1U-01G(01-02A).fm  72 ページ  2001年6月29日 金曜日 午後2時20分

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

 

 

 

 

 

 

 

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