Mazda Protege 5. Manual - part 21

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

01–02A–50

End Of Sie

DTC P0134 [ZM]

A3U010201084W47

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.

15

VERIFY TROUBLESHOOTING OF DTC P0130 
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.

•

Run OBD-ll DRIVE MODE 1 and 3.
(See 01–02A–11 OBD-II DRIVE MODE [ZM].)

•

Stop vehicle and access ON BOARD SYSTEM 
READINESS TEST to inspect DRIVE MODE 
completion status.

•

Verify RFC changes to YES for OXYGEN 
SENSOR.
— If not, run DRIVE MODE again.

•

Access DIAGNOSTIC MONITORING TEST 
RESULTS.

•

Verify following TEST # values:
— 10:01:11, 10:02:11 or 10:03:11

•

Are they all below MAX value?

Yes Replace PCM, then go to next step.

No

Go to next step.

16

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 P0134

HO2S (Front) circuit no activity detected

DETECTION 

CONDITION

•

PCM monitors input voltage from HO2S (front) when the following monitoring conditions are met. If input 
voltage from sensor never exceeds 0.55 V for 94.4 seconds, PCM determines that sensor circuit is not 
activated.

MONITORING CONDITIONS

— Drive mode 3
— Following conditions are met:

•

Engine speed is above 1,500 rpm.

•

Engine coolant temperature is above 80 

°°°°

C {176 

°°°°

F}.

Diagnostic support note

•

This is a continuous monitor (CCM).

•

MIL illuminates if PCM detects the above malfunction condition 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.

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

01–02A–51

01–02A

Diagnostic procedure

POSSIBLE 

CAUSE

•

HO2S (front) deterioration

•

HO2S (front) heater malfunction

•

Leakage from exhaust system

•

Open or short to ground circuit between HO2S (front) terminal A and PCM terminal 60

•

Insufficient compression

•

Engine malfunction

DTC P0134

HO2S (Front) circuit no activity detected

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.

•

Is other DTC present except P1170?

Yes Go to appropriate DTC troubleshooting procedures.

No

Go to next step.

4

IDENTIFY TRIGGER DTC FOR FREEZE FRAME 
DATA

•

Is DTC P0134 on FREEZE FRAME DATA?

Yes Go to next step.

No

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

5

VERIFY CURRENT INPUT SIGNAL STATUS

•

Warm up engine.

•

Access O2S11 PID using WDS or equivalent.

•

Check PID under following accelerator pedal 
condition (in PARK).
— More than 0.55 V when suddenly 

depressing accelerator pedal (rich 
condition).

— Less than 0.55 V just after release of 

accelerator pedal (lean condition)

•

Is PID reading okay?

Yes Go to Step 8.

No

Go to next step.

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

01–02A–52

End Of Sie

6

INSPECT INSTALLATION OF HO2S

•

Check if HO2S (front) is loosely installed.

•

Is sensor installed securely?

Yes Go to next step.

No

Install sensor securely, then go to Step 10.

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 

10.

No

•

Inspect the following harnesses for open or short to 
ground circuit. Repair or replace harness if necessary.
— HO2S (front) terminal A (harness-side) to PCM 

terminal 60 (harness-side)

•

Repair or replace harness if necessary.

•

If all items above are okay, replace faulty sensor.

Then go to Step 10.

8

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 Step 10.

No

Go to next step.

9

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 next 
step.

10

VERIFY TROUBLESHOOTING OF DTC P0134 
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 RPM and ECT PIDs using WDS or 
equivalent.

•

Verify that ECT PID is reading above 80 

°°°°

C 

{176 

°°°°

F}.

•

Increase engine speed above 1,500 rpm 
(RPM PID reading) for more than 94.4 
seconds.

•

Is PENDING CODE of same DTC present?

Yes Replace PCM, then go to next step.

No

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

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

01–02A–53

01–02A

DTC P0138 [ZM]

A3U010201084W48

Diagnostic procedure

DTC P0138

HO2S (rear) circuit high input

DETECTION 

CONDITION

•

PCM monitors input voltage from HO2S (rear). If input voltage from sensor is above 0.45 V for 6 seconds 
during deceleration fuel cut, PCM determines that the circuit input is high.

Diagnostic support note

•

This is a continuous monitor (CCM).

•

MIL illuminates if PCM detects the above malfunction condition 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

•

HO2S (rear) malfunction

•

Short to power circuit in wiring between HO2S (rear) terminal A and PCM terminal 35

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 OR STORED 
DTCS

•

Turn ignition key to OFF, then Start engine.

•

Verify pending codes or stored DTCs using 
WDS or equivalent.

•

Is other DTC present?

Yes Go to appropriate DTC troubleshooting procedures.

(See 01–02A–15 DTC TABLE [ZM].)

No

Go to next step.

4

IDENTIFY TRIGGER DTC FOR FREEZE FRAME 
DATA

•

Is DTC P0138 on FREEZE FRAME DATA?

Yes Go to next step.

No

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

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