Mazda Protege 5. Manual - part 59

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

01–02B–56

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 AND STORED 
DTCs

•

Turn ignition key to OFF, then start engine.

•

Verify pending and stored DTCs using WDS or 
equivalent.

•

Are other DTCs present?

Yes Go to appropriate DTC troubleshooting procedures.

No

Go to next step.

4

IDENTIFY TRIGGER DTC FOR FREEZE FRAME 
DATA

•

Is DTC P0132 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 IS 
CONCERN INTERMITTENT OR CONSTANT

•

Warm up engine.

•

Access O2S11 PID using WDS or equivalent.

•

Verify PID while racing engine (in PARK).

•

Is PID reading okay?
— 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)

Yes Go to next step.

No

Replace HO2S (front), then go to Step 12.

6

INSPECT FUEL LINE PRESSURE (EXCESSIVE 
FUEL LINE PRESSURE)

•

Start engine.

•

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 9.

No

Go to next step.

7

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 following parts and repair or replace if necessary:

•

Fuel pump maximum pressure

•

Fuel return pipe for clogging
— 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.

8

INSPECT PURGE SOLENOID VALVE 
OPERATION

•

Turn ignition key to OFF.

•

Inspect purge solenoid valve operation.

•

Is purge solenoid valve okay?

Yes Go to Step 10.

No

Replace purge solenoid valve. Then go to Step 12.

9

INSPECT PCV VALVE OPERATION

•

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

•

Is PCV valve okay?

Yes Go to next step.

No

Replace PCV, then go to Step 12.

10

INSPECT FUEL INJECTOR OPERATION

•

Turn ignition key to OFF.

•

Inspect injector.
(See 01–14–24 FUEL INJECTOR 
INSPECTION.)

•

Is injector okay?

Yes Go to next step.

No

Replace injector, then go to Step 12.

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

01–02B–57

01–02B

End Of Sie

DTC P0133 [FS]

A3U010201084W23

11

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 a 
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 to 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.

12

VERIFY TROUBLESHOOTING OF DTC P0132 
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.

•

Access ECT and RPM PIDs using WDS or 
equivalent.

•

Make sure that ECT PID is above 70 

°°°°

C {158 

°°°°

F}.

•

Increase and keep engine speed above 1,500 
rpm for at least 1 minute.

•

Is pending code of same DTC present?

Yes Replace or reprogram 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 P0133

HO2S (Front) circuit slow response

DETECTION 

CONDITION

•

PCM monitors inversion cycle period, lean-to-rich response time and rich-to-lean response time of the 
sensor. PCM calculates the average of the inversion cycle period-specified inversion cycles, average 
response time from lean-to-rich, and from rich-to-lean when monitoring conditions are met. If any exceeds 
threshold, PCM determines that circuit has malfunction.

MONITORING CONDITIONS

— Drive mode 3
— Following conditions are met:

•

Calculation load is 20—59% [at engine speed 2,000 rpm]

•

Engine speed is 1,410—4,000 rpm

•

Vehicle speed is over 3.77 km/h {2.34 mph}.

•

Engine coolant temperature is above –10

°°°°

C {14

°°°°

F}.

Diagnostic support note

•

This is an intermittent monitor. (OXYGEN SENSOR)

•

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

•

DIAGNOSTIC MONITORING TEST RESULTS is available.

•

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.

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

01–02B–58

Diagnostic procedure

POSSIBLE 

CAUSE

•

Front HO2S deterioration

•

Front HO2S heater malfunction

•

PRC solenoid valve malfunction

•

Pressure regulator malfunction

•

Fuel pump malfunction

•

Fuel filter clogged or restricted

•

Fuel leakage on fuel line from fuel distribution pipe and fuel pump

•

Fuel return hose clogged

•

Leakage from exhaust system

•

Purge solenoid valve malfunction

•

Purge solenoid hoses improper connection

•

Insufficient compression

•

Engine malfunction

DTC P0133

HO2S (Front) circuit slow response

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 AND STORED 
DTCS

•

Turn ignition key to OFF, then start engine.

•

Verify pending and/or stored DTCs using WDS 
or equivalent.

•

Is the following DTC also present?
— P0442, P0443, P0455, P0031, P0032 or 

P1450 with P0133

Yes Go to appropriate DTC troubleshooting procedures, then 

go to Step 15.
(See 01–02B–15 DTC TABLE [FS].)

No

Go to next step.

4

IDENTIFY TRIGGER DTC FOR FREEZE FRAME 
DATA

•

Is DTC P0133 on FREEZE FRAME DATA?

Yes Go to next step.

No

Go to troubleshooting procedures for DTC on FREEZE 
FRAME DATA.
(See 01–02B–15 DTC TABLE [FS].)

5

VERIFY CURRENT INPUT SIGNAL STATUS

•

Warm up engine.

•

Access O2S11 PID using WDS or equivalent.

•

Check PID under following accelerator pedal 
conditions (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 Go to Step 8.

No

Go to next step.

6

INSPECT INSTALLATION OF FRONT HO2S

•

Check if HO2S (front) is loosely installed.

•

Is sensor installed securely?

Yes Go to next step.

No

Retighten sensor, then go to Step 15.

7

INSPECT EXHAUST SYSTEM FOR GAS 
LEAKAGE

•

Visually check if any gas leakage is found 
between exhaust manifold and HO2S (front).

•

Is there any gas leakage?

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

15.

No

Replace sensor, then go to Step 15.

8

INSPECT LONG TERM FUEL TRIM

•

Access LONGFT1 PIDs.

•

Compare it with FREEZE FRAME DATA (FFD) 
recorded at Step 1.

•

Is it below FFD value?

Yes Engine is driven under rich condition. Go to next step.

No

Engine is driven under lean condition. Go to Step 11.

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

01–02B–59

01–02B

9

INSPECT FUEL LINE PRESSURE (Excessive 
fuel line pressure)

•

Start engine.

•

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

Go to next step.

10

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 pipe 

for clogging.
(See 01–14–15 FUEL PUMP UNIT INSPECTION.)

•

If any problem is found, repair or replace suspected 
parts.

•

If all items above are okay, replace pressure regulator.

Then go to Step 15.

No

Verify vacuum hoses are connected correctly.

•

If okay, replace PRC solenoid valve.

•

If not, reconnect vacuum hoses to correct position.

Then go to Step 15.

11

INSPECT FUEL LINE PRESSURE (Low fuel line 
pressure)

•

Start engine.

•

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

Go to next step.

12

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 15.

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, go to next step.

13

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 Replace pressure regulator, then go to step 15.

No

Inspect fuel pump circuit for open or poor connection.

•

Repair or replace suspected circuit.

•

If circuit is okay, replace fuel pump.

Then go to Step 15.

14

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 a 
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.

STEP

INSPECTION

ACTION

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