Mazda Protege 5. Manual - part 110

SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (FS)]

01–03B–33

01–03B

End Of Sie

NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE [FS]

A3U010318881W18

Diagnostic procedure

14

•

Disconnect vacuum hose between purge 
solenoid valve and intake manifold from 
purge solenoid valve side.

•

Plug opening end of vacuum hose.

•

Drive vehicle.

•

Does engine condition improve?

Yes

Inspect if purge solenoid valve is stuck open 
mechanically.
Inspect evaporative emission control system.

No

Go to next step.

15

•

Visually inspect CMP sensor and projections 
of camshaft pulley.

•

Are CMP sensor and projections of camshaft 
pulley okay?

Yes

Go to next step.

No

Replace malfunctioning parts.

16

•

Inspect EGR valve.

•

Is EGR valve okay?

Yes

Go to next step.

No

Replace malfunctioning parts.

17

•

Is engine compression correct?

Yes

Inspect following:

•

Valve timing

•

Internal transaxle components (ATX)

•

Clutch (MTX)

•

Brake system for dragging

No

Inspect for cause.

18

•

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

13

Knocking/pinging — Acceleration/cruise

DESCRIPTION

•

Sound is produced when air/fuel mixture is ignited by something other than spark plug (e.g. hot spot 
in combustion chamber).

POSSIBLE CAUSE

•

Engine overheating due to cooling system malfunction

•

ECT sensor malfunction

•

IAT sensor malfunction

•

Inadequate engine compression

•

Inadequate 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

•

Connect WDS or equivalent to DLC-2.

•

Access ECT PID.

•

Verify ECT PID is less than 116

°°°°

C {241

°°°°

F} 

during driving.

•

Is ECT PID less than specification?

Yes

Go to next step.

No

Inspect cooling system for cause of overheating.

2

•

Connect WDS or equivalent to DLC-2.

•

Turn ignition key on.

•

Retrieve any DTC.

•

Is “DTC” displayed?

Yes

No DTC displayed:

•

Go to next step.

No

DTC displayed:

•

Go to appropriate DTC test.

3

•

Is engine compression correct?

Yes

Go to next step.

No

Inspect for cause.

1712-1U-01G(01-03B).fm  33 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–34

End Of Sie

NO.14 POOR FUEL ECONOMY [FS]

A3U010318881W19

Diagnostic procedure

4

•

Install fuel pressure gauge between fuel filter 
and fuel distributor.

•

Start engine and run it at idle.

•

Measure fuel line pressure at idle.

•

Is fuel line pressure correct at idle?

Fuel line pressure
210—250 kPa {2.1—2.6 kgf/cm

2

, 39—45 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

•

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

14

Poor fuel economy

DESCRIPTION

•

Fuel economy is unsatisfactory.

POSSIBLE CAUSE

•

Contaminated air cleaner element

•

VICS malfunction

•

Tumble swirl control system malfunction

•

Engine cooling system malfunction

•

Improper automatic transaxle fluid level (ATX)

•

Weak spark

•

Poor fuel quality

•

Erratic or no signal from CMP sensor

•

Improper coolant level

•

Inadequate fuel pressure

•

Spark plug malfunction

•

PCV valve malfunction

•

Brake dragging

•

Improper valve timing due to jumping out of timing belt

•

Contaminated MAF sensor

•

Improper engine compression

•

Exhaust system clogging

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

•

Inspect for following:
— Air cleaner element for contamination
— Automatic transaxle fluid level
— Fuel quality
— Coolant level

•

Are all items okay?

Yes

Go to next step.

No

Service as necessary.
Repeat Step 1.

2

•

Connect WDS or equivalent to DLC-2.

•

Turn ignition key to ON.

•

Retrieve any DTC.

•

Is “DTC” displayed?

Yes

No DTC displayed:

•

Go to next step.

No

DTC displayed:

•

Go to appropriate DTC test.

3

•

Access ECT PID.

•

Drive vehicle while monitoring PID.

•

Is PID within specification?

Yes

Go to next step.

No

Inspect for coolant leakage, cooling fan and condenser 
fan operations or thermostat operation.

1712-1U-01G(01-03B).fm  34 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–35

01–03B

End Of Sie

4

•

Is strong blue spark visible at each 
disconnected high-tension lead while 
cranking engine?

Yes

Inspect for following:

•

Spark plugs malfunction

•

CMP sensor is improperly installed.

•

Trigger wheel damage on camshaft

•

Open or short circuit on CMP sensor

•

Open or short circuit between CMP sensor and 
PCM terminal 85 or 86

Repair or replace malfunctioning parts.
If okay, go to next step.

No

Inspect following:

•

High-tension leads

•

Ignition coil and connector

5

•

Install fuel pressure gauge between fuel filter 
and fuel distributor.

•

Start engine and run it at idle.

•

Measure fuel line pressure 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.

6

•

Inspect VICS operation.
(See 01–03B–57 VICS Operation 
Inspection.)

•

Does VICS work properly?

Yes

Go to next step.

No

Repair or replace malfunctioning parts.

7

•

Inspect tumble swirl control system 
operation. (See 01–03B–57 Variable Tumble 
Control System (VTCS) Inspection.)

•

Does tumble swirl control system work 
properly?

Yes

Go to next step.

No

Repair or replace malfunctioning parts.

8

•

Remove and shake PCV valve.

•

Does PCV valve rattle?

Yes

Go to next step.

No

Replace PCV valve.

9

•

Is there any restriction in exhaust system?

Yes

Inspect exhaust system.

No

Go to next step.

10

•

Is brake system functioning properly?

Yes

Go to next step.

No

Inspect for cause.

11

•

Inspect MAF sensor for contamination.

•

Is there any contamination?

Yes

Replace MAF sensor.

No

Go to next step.

12

•

Is engine compression correct?

Yes

Inspect valve timing.

No

Inspect for cause.

13

•

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

1712-1U-01G(01-03B).fm  35 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–36

NO.15 EMISSION COMPLIANCE [FS]

A3U010318881W20

Diagnostic procedure

15

Emission compliance

DESCRIPTION

•

Fails emissions test

POSSIBLE CAUSE

•

Vacuum lines leakage or blockage

•

Cooling system malfunction

•

Spark plug malfunction

•

Leakage from intake manifold

•

Erratic or no signal from CMP sensor

•

Inadequate fuel pressure

•

PCV valve malfunction or incorrect valve installation

•

EGR valve malfunction

•

Exhaust system clogging

•

Fuel tank ventilation system malfunction

•

Charcoal canister damage

•

Excessive carbon is built up in combustion chamber.

•

Improper engine compression

•

Improper valve timing

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

•

Inspect for following:
— Vacuum lines for leakage or blockage
— Electrical connections
— Proper maintenance schedule followed
— Intake-air system and air cleaner element 

concerns: obstructions, leakage or 
dirtiness

•

Are all items okay?

Yes

Go to next step.

No

Service as necessary.
Repeat Step 1.

2

•

Connect WDS or equivalent to DLC-2.

•

Turn ignition key to ON.

•

Retrieve any DTC.

•

Is “DTC” displayed?

Yes

No DTC displayed:

•

Go to next step.

No

DTC displayed:

•

Go to appropriate DTC test.

3

•

Is any other drivability concern present?

Yes

Go to appropriate symptom troubleshooting.

No

Go to next step.

4

•

Connect WDS or equivalent to DLC-2.

•

Access ECT PID.

•

Warm up engine and run it at idle.

•

Verify ECT PID is correct.

•

Is ECT PID correct?

Yes

Go to next step.

No

Inspect for coolant leakage, cooling fan and condenser 
fan operation or thermostat operation.

5

•

Is strong blue spark visible at each 
disconnected high-tension lead while 
cranking engine?

Yes

Inspect for following:

•

Spark plugs malfunction

•

CMP sensor is improperly installed.

•

Damage of trigger wheel on camshaft

•

Open or short circuit on CMP sensor

•

Open or short circuit between CMP sensor and 
PCM terminal 85 or 86

Repair or replace malfunctioning parts.
If okay, go to next step.

No

Inspect following:

•

High-tension leads

•

Ignition coil and connector

1712-1U-01G(01-03B).fm  36 ページ  ２００１年６月２９日 金曜日 午前９時３３分