Mazda Protege 5. Manual - part 15

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

01–02A–26

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 CURRENT INPUT SIGNAL STATUS-IS 
CONCERN INTERMITTENT OR CONSTANT

•

Connect WDS or equivalent to DLC-2.

•

Start engine.

•

Access MAF PID.

•

Is MAF PID above 0 g/s and 168.7 g/s or 
below?

Yes Intermittent concern exists. Go to INTERMITTENT 

CONCERN TROUBLESHOOTING procedure.
(See 01–03A–4 INTERMITTENT CONCERN 
TROUBLESHOOTING [ZM].)

No

Go to next step.

4

INSPECT MAF SENSOR CONNECTOR FOR 
POOR CONNECTION

•

Turn ignition key to OFF.

•

Disconnect MAF sensor connector.

•

Check for poor connection (damaged/pulled-
out terminals, corrosion, etc.).

•

Is there malfunction?

Yes Repair or replace terminals, then go to Step 10.

No

Go to next step.

5

CHECK POWER SUPPLY CIRCUIT FOR OPEN 
CIRCUIT

•

Turn ignition key to ON (Engine OFF).

•

Check voltage at MAF sensor terminal A 
(harness-side).

•

Is voltage B+?

Yes Go to next step.

No

Inspect for open circuit in wiring harness between MAF 
sensor terminal A (harness-side) and main relay.
Repair or replace harness, then go to Step 10.

6

INSPECT MAF SENSOR GROUND CIRCUIT 
FOR OPEN CIRCUIT

•

Check for continuity between MAF sensor 
terminal B (harness-side) and body ground.

•

Is there continuity?

Yes Go to next step.

No

Check for open circuit between PCM terminal 36 (harness-
side) and MAF sensor terminal B (harness-side).
Repair or replace suspected harness, then go to Step 10.

7

INSPECT PCM CONNECTOR FOR POOR 
CONNECTION

•

Turn ignition key to OFF.

•

Disconnect PCM connector.

•

Check for poor connection (damaged/pulled-
out terminals, corrosion, etc.).

•

Is there malfunction?

Yes Repair terminal, then go to Step 10.

No

Go to next step.

8

INSPECT MAF SENSOR SIGNAL CIRCUIT FOR 
OPEN CIRCUIT

•

Connect breakout box with PCM disconnected.

•

Check for continuity between MAF sensor 
terminal C (harness-side) and breakout box 
terminal 88 (harness-side).

•

Is there continuity?

Yes Go to next step.

No

Repair or replace suspected harness, then go to Step 10.

9

INSPECT MAF SENSOR SIGNAL CIRCUIT FOR 
SHORTS

•

Check continuity between following circuits:
— MAF sensor terminal C (harness-side) and 

body ground

— MAF sensor connector terminal B (harness-

side) and C (harness-side)

•

Is there continuity?

Yes Repair or replace suspected harness, then go to next step.

No

Go to next step.

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

01–02A–27

01–02A

End Of Sie

10

VERIFY TROUBLESHOOTING OF DTC P0102 
COMPLETED

•

Make sure to reconnect all disconnected 
connectors.

•

Start engine.

•

Clear DTC from memory using WDS or 
equivalent.

•

Access MAF PID.

Note

•

MAF PID should indicate above 0 g/s 
and 168.7 g/s or below.

•

Is 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–28

DTC P0103 [ZM]

A3U010201084W34

Diagnostic procedure

DTC P0103

MAF circuit high input

DETECTION 

CONDITION

•

PCM monitors input voltage from MAF sensor after ignition key is turned on. If input voltage at PCM 
terminal 88 is above 4.90 V, PCM determines that MAF circuit has a malfunction.

Diagnostic support note

•

This is a continuous monitor (CCM).

•

MIL illuminates if PCM detects the above malfunction condition during first drive cycle. Therefore, 
PENDING CODE is not available.

•

FREEZE FRAME DATA is available.

•

DTC is stored in PCM memory.

POSSIBLE 

CAUSE

•

MAF sensor malfunction

•

Connector or terminal malfunction

•

Short to power circuit in wiring between MAF sensor terminal C and PCM terminal 88

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, then go to next step.

No

Go to next step.

3

VERIFY CURRENT INPUT SIGNAL STATUS-IS 
CONCERN INTERMITTENT OR CONSTANT

•

Connect WDS or equivalent to DLC-2.

•

Start engine.

•

Access MAF PID.

•

Is MAF PID above 0 g/s and 168.7 g/s or 
below?

Yes Intermittent concern exists. Go to INTERMITTENT 

CONCERN TROUBLESHOOTING procedure.
(See 01–03A–4 INTERMITTENT CONCERN 
TROUBLESHOOTING [ZM].)

No

Go to next step.

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

01–02A–29

01–02A

End Of Sie

DTC P0106 [ZM]

A3U010201084W35

4

INSPECT MAF SENSOR CONNECTOR FOR 
POOR CONNECTION 

•

Turn ignition key to OFF.

•

Disconnect the MAF sensor connector.

•

Check for bent terminal.

•

Is there malfunction?

Yes Repair or replace terminals, then go to Step 7.

No

Go to next step.

5

INSPECT MAF SIGNAL CIRCUIT FOR SHORT 
TO POWER CIRCUIT

•

Turn ignition key to ON (Engine OFF).

•

Measure voltage between MAF sensor 
terminal C (harness-side) and body ground.

•

Is voltage 0 V?

Yes Go to next step.

No

Repair or replace suspected harness, then go to Step 7.

6

INSPECT PCM CONNECTOR FOR POOR 
CONNECTION 

•

Turn ignition key to OFF.

•

Disconnect PCM connector.

•

Check for bent terminals.

•

Is there malfunction?

Yes Repair terminal, then go to Step 7.

No

Go to next step.

7

VERIFY TROUBLESHOOTING OF DTC P0103 
COMPLETED

•

Make sure to reconnect all disconnected 
connectors.

•

Start engine.

•

Clear DTC from memory using WDS or 
equivalent.

•

Access MAF PID.

Note

•

MAF PID should indicate above 0 g/s 
and 168.7 g/s or below.

•

Is 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 P0106

BARO circuit performance problem

DETECTION 

CONDITION

•

PCM monitors differences between intake manifold vacuum and atmospheric pressure at idle, which EGR 
boost sensor detects by switching EGR boost sensor solenoid. If difference is below 6.43 kPa {48.2 
mmHg, 1.90 inHg}, PCM determines that there is EGR boost sensor performance problem.

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

•

EGR boost sensor malfunction or substandard performance

•

EGR boost sensor solenoid malfunction

•

Loose, damaged, misconnected, clogged or frozen moisture in vacuum hose from EGR boost sensor 
solenoid to EGR boost sensor

•

PCM malfunction

•

Loose, damaged, misconnected, clogged or frozen moisture in vacuum hose from EGR boost sensor 
solenoid to EGR valve

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