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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