Mazda Protege 5. Manual - part 24

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

01–02A–62

Diagnostic procedure

POSSIBLE 

CAUSE

•

CKP sensor malfunction

•

CMP sensor malfunction

•

Ignition coil malfunction

•

High-tension lead malfunction

•

MAF sensor contamination

•

Excess air suction in intake-air system (between MAF sensor and dynamic chamber)

•

Fuel pump malfunction

•

Fuel pressure regulator malfunction

•

Fuel line clogged

•

Fuel filter clogged

•

Fuel leakage in fuel line

•

Purge control solenoid valve malfunction

•

PCV valve malfunction

•

EGR valve malfunction

•

Vacuum hoses damaged or improper connection

•

Related connector and terminal malfunction

•

Related wiring harness malfunction

•

Poor fuel quality

DTC P0300

Random misfire detection

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.

(See 01–02A–15 DTC TABLE [ZM].)

No

Go to next step.

4

VERIFY CURRENT INPUT SIGNAL STATUS 
(IGNITION KEY TO ON/IDLE)

•

Access ECT, IAT, MAF, RPM, TP, and VS 
PIDs using WDS or equivalent.
(See 01–40A–7 PCM Inspection Using the 
SST (WDS or equivalent).)

•

Is there any signal that is far out of 
specification when ignition switch is ON and 
engine runs at idle?

Yes Inspect suspected circuit and/or part according to 

inspection results.
(See 01–40A–7 PCM Inspection Using the SST (WDS or 
equivalent).)
Then go to Step 23.

No

Go to next step.

5

VERIFY CURRENT INPUT SIGNAL STATUS 
UNDER TROUBLE CONDITION

•

Inspect same PIDs as in Step 4 while 
simulating FREEZE FRAME DATA condition.

•

Is there any signal which causes drastic 
changes?

Yes Inspect suspected circuit and/or part according to 

inspection results.
(See 01–40A–7 PCM Inspection Using the SST (WDS or 
equivalent).)
Then go to Step 23.

No

Go to next step.

6

INSPECT CMP SENSOR

•

Inspect CMP sensor.
(See 01–40A–35 CAMSHAFT POSITION 
(CMP) SENSOR INSPECTION [ZM].)

•

Is CMP sensor okay?

Yes Go to next step.

No

Inspect installation condition and damages on timing belt 
and gears, repair faulty parts.

•

If it is okay, replace CMP sensor.

Then go to Step 23.

7

VERIFY CKP SENSOR INSTALLATION 
CONDITION

•

Check CKP sensor for looseness.

•

Is CKP sensor loose?

Yes Retighten CKP sensor, then go to Step 23.

No

Go to next step.

8

CHECK IGNITION COIL OPERATION AND 
HIGH-TENSION LEAD WITH TIMING LIGHT

•

Verify blinking condition on each cylinder using 
timing light at idle.

•

Do all cylinders show blinking condition?

Yes Go to Step 12.

No

Go to next step.

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

01–02A–63

01–02A

9

CHECK HIGH-TENSION LEADS OF NON- 
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 23.

10

INSPECT POWER SUPPLY TERMINAL AT 
IGNITION COIL CONNECTOR

•

Disconnect ignition coil connector.

•

Turn ignition key to ON (Engine OFF).

•

Measure voltage between ignition coil terminal 
A (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 23.

11

INSPECT IGNITION COIL RESISTANCE

•

Check ignition coil resistance.
(See 01–18–2 IGNITION COIL INSPECTION.)

•

Is coil resistance okay?

Yes Go to Step 23.

No

Replace ignition coil, then go to Step 23.

12

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 23.

13

INSPECT EXCESSIVE AIR SUCTION IN 
INTAKE-AIR SYSTEM

•

Inspect for air leakage at following:
— Between MAF sensor and throttle body
— Between throttle body and dynamic 

chamber

•

Is there malfunction?

Yes Repair or replace suspected part, then go to Step 23.

No

Go to next step.

14

INSPECT FUEL LINE PRESSURE

•

Inspect fuel line pressure.
(See 01–14–6 FUEL PRESSURE 
INSPECTION.)

•

Is fuel line pressure okay?

Yes Go to Step 18.

No

If fuel line pressure is too high, go to next step.
If fuel line pressure is too low, go to Step 16.

15

VERIFY VACUUM LEADING TO PRESSURE 
REGULATOR

•

Disconnect vacuum hose from pressure 
regulator.

•

Start engine.

•

Is vacuum felt at opening end of vacuum hose?

Yes Check following:

•

Fuel pump maximum pressure
(See 01–14–15 FUEL PUMP UNIT INSPECTION.)

•

Fuel return hose for clogging
— If all above are okay, replace pressure regulator.

Then go to Step 23.

No

Verify vacuum hoses are connected correctly.

•

If okay, replace pressure regulator control solenoid 
valve.

•

If not, reconnect vacuum hose in proper position.

Then go to Step 23.

16

INSPECT FUEL PUMP MAXIMUM PRESSURE

•

Inspect fuel pump maximum pressure.
(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 23.

•

If okay, replace fuel pump, then go to Step 23.

17

INSPECT FUEL LINE FROM FUEL PUMP TO 
FUEL DELIVERY PIPE

•

Visually inspect for fuel leakage in fuel line for 
any leakage.

•

Is any fuel leakage found?

Yes Replace suspected fuel line, then go to Step 23.

No

Inspect fuel filters for following:

•

Restriction or clogging at fuel filter (high-pressure).

•

Foreign material 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 material or stain is found inside fuel filter (low-
pressure), clean fuel tank and fuel filter (low-pressure).

•

If all items above are okay, replace pressure regulator.

Then, go to Step 23.

STEP

INSPECTION

ACTION

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

01–02A–64

End Of Sie

18

INSPECT ENGINE COMPRESSION

•

Inspect engine compression.
(See 01–10A–8 COMPRESSION 
INSPECTION [ZM].)

•

Is it okay?

Yes Go to next step.

No

Implement engine overhaul for repairs, then go to Step 23.

19

INSPECT PURGE CONTROL SOLENOID 
VALVE FOR OPERATION

•

Inspect purge solenoid valve.
(See 01–16–12 PURGE SOLENOID VALVE 
INSPECTION.)

•

Is purge control solenoid valve operation okay?

Yes Go to next step.

No

Replace purge control solenoid valve, then go to Step 23.

20

INSPECT PCV VALVE OPERATION

•

Turn ignition key to OFF.

•

Remove PCV valve and check valve operation.
(See 01–16–18 POSITIVE CRANKCASE 
VENTILATION (PCV) VALVE INSPECTION.)

•

Is PCV valve operation okay?

Yes Replace PCV valve, then go to Step 23.

No

Go to next step.

21

INSPECT EGR VALVE FOR OPERATION

•

Remove EGR valve.

•

Visually check for stuck open condition.

•

Is EGR valve stuck open?

Yes Repair or replace EGR valve, then go to Step 23.

No

Go to next step.

22

INSPECT SEALING OF ENGINE COOLANT 
PASSAGE

Warning

••••

Removing radiator cap when radiator is 
hot is dangerous. Scalding coolant and 
steam may shoot out and cause serious 
injury.

••••

When removing radiator cap, wrap thick 
cloth around and turn it slowly.

•

Remove radiator cap.

•

Implement procedure to bleed air from engine 
coolant, then run engine at idle.

•

Is there any small bubble which makes engine 
coolant white at filling opening?

Note

•

Large bubbles are normal since they are 
remaining air coming out from engine 
coolant passage.

Yes Air gets in from poor sealing on head gasket or other areas 

between combustion chamber and engine coolant 
passage. Repair or replace faulty parts, then go to next 
step.

No

Go to next step.

23

VERIFY TROUBLESHOOTING OF MISFIRE DTC 
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 1.
(See 01–02A–11 Mode 1 (PCM adaptive 
memory procedure drive mode).)

•

Is PENDING CODE of same DTC present?

Yes Replace PCM, then go to next step.

No

Go to next step.

24

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

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

01–02A–65

01–02A

DTC P0301, P0302, P0303, P0304 [ZM]

A3U010201085W07

Diagnostic procedure

DTC P0301
DTC P0302
DTC P0303
DTC P0304

Cylinder No.1 misfire detected
Cylinder No.2 misfire detected
Cylinder No.3 misfire detected
Cylinder No.4 misfire detected

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 
occured, which can damage the catalytic converter or affect emission performance.

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.

POSSIBLE 

CAUSE

•

Spark plug malfunction

•

High-tension lead malfunction

•

Fuel injector malfunction

•

Air suction in intake-air system (between dynamic chamber and cylinder head)

•

Inadequate engine compression due to engine internal malfunction

•

Related connector or terminal malfunction

•

Related wiring harness 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.

(See 01–02A–15 DTC TABLE [ZM].)

No

Go to next step.

4

VERIFY CURRENT INPUT SIGNAL STATUS 
(IGNITION KEY TO ON /IDLE)

•

Access ECT, IAT, MAF, RPM, TP and VS PIDs 
using WDS or equivalent.
(See 01–40A–7 PCM Inspection Using the 
SST (WDS or equivalent).)

•

Is there any signal that is far out of 
specification when ignition switch is ON and 
engine runs at idle?

Yes Inspect suspected circuit and/or part according to 

inspection results. Then go to Step 13.
(See 01–40A–7 PCM Inspection Using the SST (WDS or 
equivalent).)

No

Go to next step.

5

VERIFY CURRENT INPUT SIGNAL STATUS 
UNDER TROUBLE CONDITION

•

Inspect same PIDs as in Step 4 while 
simulating FREEZE FRAME DATA condition.

•

Is there any signal which causes drastic 
changes?

Yes Inspect suspected circuit and/or part according to 

inspection results. Then go to Step 13.
(See 01–40A–7 PCM Inspection Using the SST (WDS or 
equivalent).)

No

Go to next step.

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