Mazda Protege 5. Manual - part 40

 

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Mazda Protege 5. Manual - part 40

 

 

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

01–02A–126

Diagnostic procedure

DTC P1497

EGR valve stepping motor coil 2 open or short circuit

STEP

INSPECTION

ACTION

1

VERIFY RELATED REPAIR INFORMATION 
AVAILABILITY

Check for related Service Bulletins availability.

Is any 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.

2

CLASSIFY INTERMITTENT CONCERN OR 
CONTINUOUS CONCERN

Turn ignition key to OFF then ON (Engine 
OFF).

Is same DTC present?

Yes Go to next step.

No

Refer to intermittent concern.
(See 01–03A–4 INTERMITTENT CONCERN 
TROUBLESHOOTING [ZM].)

3

CLASSIFY POWER CIRCUIT OR CONTROL 
CIRCUIT MALFUNCTION

Is same DTC and P1496 present?

Yes Malfunction at EGR valve or power circuit.

Go to next step.

No

Malfunction at EGR valve or control circuit.
Go to Step 6.

4

INSPECT EGR VALVE FOR POOR 
CONNECTION

Turn ignition key to OFF.

Disconnect EGR valve connector.

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

Is there malfunction?

Yes Repair or replace terminals, then go to Step 11.

No

Go to next step.

5

INSPECT POWER CIRCUIT FOR OPEN 
CIRCUIT

Turn ignition key to ON (Engine OFF).

Measure voltage between EGR valve terminal 
C (harness-side) and body ground.

Is voltage B+?

Yes Inspect EGR valve coils 1 and 2.

(See 01–16–15 EGR VALVE INSPECTION.)

If there is a malfunction, replace EGR valve, and then 
go to Step 11.

If there is no malfunction, then go to Step 11.

No

Repair or replace harness for open circuit, then go to Step 
11.

6

INSPECT EGR VALVE FOR POOR 
CONNECTION

Turn ignition key to OFF.

Disconnect EGR valve connector.

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

Is there malfunction?

Yes Repair or replace terminals, then go to Step 11.

No

Go to next step.

1712-1U-01G(01-02A).fm  126 ページ  2001年6月29日 金曜日 午後2時20分

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

01–02A–127

01–02A

End Of Sie

DTC P1498 [ZM]

A3U010201083W29

7

INSPECT EGR VALVE

Measure resistance between EGR valve 
terminals C and A (part-side).

Is resistance within 20—24 ohms?

Yes Go to next step.

No

Replace EGR valve, then go to Step 11.

8

INSPECT PCM CONNECTOR FOR POOR 
CONNECTION

Disconnect PCM connector.

Check for poor connection at terminal 72 
(damaged/pulled-out terminals, corrosion, 
etc.).

Is there malfunction?

Yes Repair terminal, then go to Step 11.

No

Go to next step.

9

INSPECT CONTROL CIRCUIT FOR SHORT

Check continuity between EGR valve terminal 
A (harness-side) and body ground.

Is there continuity?

Yes Repair or replace harness for short to ground, then go to 

Step 11.

No

Measure voltage between EGR valve terminal A and body 
ground.

If voltage is B+, repair or replace harness for short to 
power, then go to next step.

If voltage is approx. 0 V, go to next step.

10

INSPECT CONTROL CIRCUIT FOR OPEN 
CIRCUIT

Connect breakout box with PCM disconnected.

Check for continuity between EGR valve 
terminal A (harness-side) and breakout box 
terminal 72.

Is there continuity?

Yes Go to next step.

No

Repair or replace harness for open, then go to next step.

11

VERIFY TROUBLESHOOTING OF DTC P1497 
COMPLETED

Make sure to reconnect all disconnected 
connectors.

Turn ignition key to OFF, then ON (Engine 
OFF).

Is same DTC present?

Yes Replace PCM, then go to next step.

No

Go to next step.

12

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 P1498

EGR valve stepping motor coil 3 open or short circuit

DETECTION 

CONDITION

PCM monitors input voltages from EGR valve coil control circuit just after turning ignition key to ON. If 
voltage at PCM terminal 46 remains low or high, PCM determines that EGR valve circuit has malfunction.

Diagnostic support note

This is a diagnostic support DTC (monitored once per key cycle).

MIL does not illuminate.

FREEZE FRAME DATA is not available.

DTC is not stored in PCM memory.

POSSIBLE 

CAUSE

EGR valve malfunction

Connector or terminal malfunction

Short to ground circuit in wiring between EGR valve terminal B and PCM terminal 46

Open circuit in wiring between EGR valve terminal B and PCM terminal 46

Short to power circuit in wiring between EGR valve terminal B and PCM terminal 46

Open circuit in wiring between main relay terminal D and EGR valve terminal D

PCM malfunction

1712-1U-01G(01-02A).fm  127 ページ  2001年6月29日 金曜日 午後2時20分

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

01–02A–128

Diagnostic procedure

DTC P1498

EGR valve stepping motor coil 3 open or short circuit

STEP

INSPECTION

ACTION

1

VERIFY RELATED REPAIR INFORMATION 
AVAILABILITY

Check for related Service Bulletins availability.

Is any 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.

2

CLASSIFY INTERMITTENT CONCERN OR 
CONTINUOUS CONCERN

Turn ignition key to OFF then ON (Engine 
OFF).

Is same DTC present?

Yes Go to next step.

No

Refer to intermittent concern.
(See 01–03A–4 INTERMITTENT CONCERN 
TROUBLESHOOTING [ZM].)

3

CLASSIFY POWER CIRCUIT OR CONTROL 
CIRCUIT MALFUNCTION

Is same DTC and P1499 present?

Yes Malfunction at EGR valve or power circuit.

Go to next step.

No

Malfunction at EGR valve or control circuit.
Go to Step 6.

4

INSPECT EGR VALVE FOR POOR 
CONNECTION

Turn ignition key to OFF.

Disconnect EGR valve connector.

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

Is there malfunction?

Yes Repair or replace terminals, then go to Step 11.

No

Go to next step.

5

INSPECT POWER CIRCUIT FOR OPEN 
CIRCUIT

Turn ignition key to ON (Engine OFF).

Measure voltage between EGR valve terminal 
D (harness-side) and body ground.

Is voltage B+?

Yes Inspect EGR valve coils 3 and 4.

(See 01–16–15 EGR VALVE INSPECTION.)

If there is a malfunction, replace EGR valve, and then 
go to Step 11.

If there is no malfunction, go to Step 11.

No

Repair or replace harness for open circuit, then go to Step 
11.

6

INSPECT EGR VALVE FOR POOR 
CONNECTION

Turn ignition key to OFF.

Disconnect EGR valve connector.

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

Is there malfunction?

Yes Repair or replace terminals, then go to Step 11.

No

Go to next step.

1712-1U-01G(01-02A).fm  128 ページ  2001年6月29日 金曜日 午後2時20分

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

01–02A–129

01–02A

End Of Sie

DTC P1499 [ZM]

A3U010201083W30

7

INSPECT EGR VALVE

Measure resistance between EGR valve 
terminals D and B (part-side).

Is resistance within 20—24 ohms?

Yes Go to next step.

No

Replace EGR valve, then go to Step 11.

8

INSPECT PCM CONNECTOR FOR POOR 
CONNECTION

Disconnect PCM connector.

Check for poor connection at terminal 46 
(damaged/pulled-out terminals, corrosion, 
etc.).

Is there malfunction?

Yes Repair terminals, then go to Step 11.

No

Go to next step.

9

INSPECT CONTROL CIRCUIT FOR SHORT

Check continuity between EGR valve terminal 
B (harness-side) and body ground.

Is there continuity?

Yes Repair or replace harness for short to ground, then go to 

Step 11.

No

Measure voltage between EGR valve terminal B and body 
ground.

If voltage is B+, repair or replace harness for short to 
power, then go to next step.

If voltage is approx. 0 V, go to next step.

10

INSPECT CONTROL CIRCUIT FOR OPEN 
CIRCUIT

Connect breakout box with PCM disconnected.

Check for continuity between EGR valve 
terminal B (harness-side) and breakout box 
terminal 46.

Is there continuity?

Yes Go to next step.

No

Repair or replace harness for open, then go to next step.

11

VERIFY TROUBLESHOOTING OF DTC P1498 
COMPLETED

Make sure to reconnect all disconnected 
connectors.

Turn ignition key to OFF, then ON (Engine 
OFF).

Is same DTC present?

Yes Replace PCM, then go to next step.

No

Go to next step.

12

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 P1499

EGR valve stepping motor coil 4 open or short circuit

DETECTION 

CONDITION

PCM monitors input voltages from EGR valve coil control circuit just after turning ignition key to ON. If 
voltage at PCM terminal 56 remains low or high, PCM determines that EGR valve circuit has malfunction.

Diagnostic support note

This is a diagnostic support DTC (monitored once per key cycle).

MIL does not illuminate.

FREEZE FRAME DATA is not available.

DTC is not stored in PCM memory.

POSSIBLE 

CAUSE

EGR valve malfunction

Connector or terminal malfunction

Short to ground circuit in wiring between EGR valve terminal F and PCM terminal 56

Open circuit in wiring between EGR valve terminal F and PCM terminal 56

Short to power circuit in wiring between EGR valve terminal F and PCM terminal 56

Open circuit in wiring between main relay terminal D and EGR valve terminal D

PCM malfunction

1712-1U-01G(01-02A).fm  129 ページ  2001年6月29日 金曜日 午後2時20分

 

 

 

 

 

 

 

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