Mazda CX 7. Manual — part 44
ON-BOARD DIAGNOSTIC [L3 WITH TC]
01-02–131
01-02
End Of Sie
WM: DTC P04XX
DTC P0401[L3 WITH TC]
id010239815300
13
INSPECT STOPPER PIN MECHANISM
• Remove the timing chain.
• Inspect the stopper pin.
(See01-10-27 VARIABLE VALVE TIMING
ACTUATOR INSPECTION[L3 WITH TC].)
• Is the stopper pin mechanism normal?
Yes
Go to the next step.
No
Replace the variable valve timing actuator, then go to Step
15.
14
INSPECT ROTOR POSITION
• Remove the variable valve timing actuator.
(See01-10-28 VARIABLE VALVE TIMING
ACTUATOR REMOVAL/INSTALLATION[L3
WITH TC])
• Is the rotor position at the maximum valve
timing retard?
Yes
VARIABLE VALVE TIMING MECHANISM NORMAL
Note
• This DTC is detected as an intermittent concern.
• The intermittent concern might be removed by
cleaning the variable valve timing mode control
function.
Go to the next step.
No
Replace the variable valve timing actuator, then go to the
next step.
15
VERIFY TROUBLESHOOTING OF DTC P0340
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn ignition switch to the ON position (Engine
off).
• Clear the DTC from the PCM memory using
the M-MDS.
• Start the engine.
• Access the MAF PID using the M-MDS.
Note
• The MAF PID should indicate 1.95 g/s
{0.25 lb/min.} or above during this test
• Is same DTC present?
Yes
Replace the PCM, then go to the next step.
(See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH
TC].)
No
Go to the next step.
16
VERIFY AFTER REPAIR PROCEDURE
• Perform the “After Repair Procedure”.
(See01-02-10 AFTER REPAIR
PROCEDURE[L3 WITH TC].)
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No
Troubleshooting completed.
STEP
INSPECTION
ACTION
DTC P0401
EGR flow insufficient detected
DETECTION
CONDITION
• PCM monitors the difference in intake manifold pressures when the EGR is operated and when it is
stopped. If the difference is too small, the PCM determines that the EGR flow is insufficient.
Diagnostic support note
• This is an intermittent monitor (EGR system).
• The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or
in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is available.
• DTCs are stored in the PCM memory.
POSSIBLE
CAUSE
• EGR valve malfunction
• MAP sensor malfunction
• EGR gasket malfunction
• Vacuum hose looseness or damage
• PCM malfunction
1871-1U-06B(01-02).fm 131 ページ 2006年3月15日 水曜日 午前10時32分
ON-BOARD DIAGNOSTIC [L3 WITH TC]
01-02–132
Diagnostic procedure
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA AND
DIAGNOSTIC MONITORING TEST RESULTS
HAVE BEEN RECORDED
• Have the FREEZE FRAME DATA and
DIAGNOSTIC MONITORING TEST RESULTS
(EGR system related) been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA and DIAGNOSTIC
MONITORING TEST RESULTS on the repair order, then
go to the next step.
2
VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Bulletins and/or on-
line repair information availability.
• Is any related repair information available?
Yes
Perform the repair or diagnosis according to the available
repair information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT FOR OTHER DTCS
• Turn the ignition switch off then to the ON
position (Engine off).
• Have other DTCs been stored?
Yes
Repair the circuit malfunction for applicable DTCs.
No
Go to the next step.
4
INSPECT VACUUM HOSE CONDITION
• Inspect freezing vacuum hoses for clogs,
damage, frozen, or vacuum leakage.
• Is there any malfunction?
Yes
Replace the vacuum hoses, then go to Step 8.
No
Go to the next step.
5
INSPECT EGR VALVE MALFUNCTION
• Inspect the EGR valve.
(See01-16-12 EGR VALVE INSPECTION[L3
WITH TC].)
• Is the EGR valve normal?
Yes
Go to the next step.
No
Replace the EGR valve, then go to Step 8.
6
INSPECT MAP SENSOR MALFUNCTION
• Perform the MAP sensor inspection.
(See01-40-29 MANIFOLD ABSOLUTE
PRESSURE (MAP) SENSOR
INSPECTION[L3 WITH TC].)
• Is the EGR valve normal?
Yes
Go to the next step.
No
Replace the MAP sensor, then go to Step 8.
7
INSPECT EGR VALVE PASSAGE
• Turn the ignition switch off.
• Remove the EGR valve.
• Is the gasket installation normal?
Yes
Go to the next step.
No
Install the gasket correctly, then go to the next step.
8
MONITOR EGR SYSTEM BY DRIVE MODE
• Clear the DTC from the PCM memory using
the M-MDS.
• Run the PCM Adaptive Memory Procedure
Drive Mode.
(See01-02-10 OBD-II DRIVE MODE[L3 WITH
TC].)
• Stop the vehicle and access the ON BOARD
READINESS TEST to inspect the DRIVE
MODE completion status.
• Verify the FUEL_EVAL and EGR_EVAL PIDs
status.
• Do the FUEL_EVAL and EGR_EVAL PIDs
change to Yes?
Yes
Go to the next step.
No
Retry this step.
9
VERIFY TROUBLESHOOTING OF DTC P0401
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Access the DIAGNOSTIC MONITORING
TEST RESULTS.
(See01-02-7 ON-BOARD DIAGNOSTIC
TEST[L3 WITH TC].)
• Verify the TEST #10: 31: 83 (EGR pressure
variation) value.
• Is the value within the specification?
Yes
Go to the next step.
No
Replace the PCM, then go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
• Perform the “AFTER REPAIR PROCEDURE”.
(See01-02-10 AFTER REPAIR
PROCEDURE[L3 WITH TC].)
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No
Troubleshooting completed.
1871-1U-06B(01-02).fm 132 ページ 2006年3月15日 水曜日 午前10時32分
ON-BOARD DIAGNOSTIC [L3 WITH TC]
01-02–133
01-02
End Of Sie
DTC P0403[L3 WITH TC]
id010239807100
DTC P0403
EGR valve (stepper motor) circuit malfunction
DETECTION
CONDITION
• PCM monitors the input voltage from the EGR valve. If the voltage remain low or high, the PCM determines
that the EGR valve circuit has a malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if the PCM detects above malfunction condition in two consecutive drive cycles or in one
drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is not available.
• DTCs are not stored in the PCM memory.
POSSIBLE
CAUSE
• EGR valve malfunction
• Connector or terminal malfunction
• Short to the power supply in the wiring harness between EGR valve terminal E and PCM terminal 2AQ
• Short to the power supply in the wiring harness between EGR valve terminal A and PCM terminal 2AM
• Short to the power supply in the wiring harness between EGR valve terminal B and PCM terminal 2AR
• Short to the power supply in the wiring harness between EGR valve terminal F and PCM terminal 2AN
• Short to ground circuit in wiring harness between EGR valve terminal E and PCM terminal 2AQ
• Short to ground circuit in wiring harness between EGR valve terminal A and PCM terminal 2AM
• Short to ground circuit in wiring harness between EGR valve terminal B and PCM terminal 2AR
• Short to ground circuit in wiring harness between EGR valve terminal F and PCM terminal 2AN
• Open circuit in the wiring harness between EGR valve terminal E and PCM terminal 2AQ
• Open circuit in the wiring harness between EGR valve terminal A and PCM terminal 2AM
• Open circuit in the wiring harness between EGR valve terminal B and PCM terminal 2AR
• Open circuit in the wiring harness between EGR valve terminal F and PCM terminal 2AN
• Open circuit in the wiring harness between main relay terminal D and EGR valve terminal C
• Open circuit in the wiring harness between main relay terminal D and EGR valve terminal D
• PCM malfunction
MAIN RELAY
C
E
A
B
F
D
C
2AQ
2AM
2AR
2AN
PCM
PCM
WIRING HARNESS SIDE CONNECTOR
EGR VALVE
WIRING HARNESS SIDE CONNECTOR
C
D
A
B
E
F
EGR VALVE
5
7
8
6
4
3
3
3
3
3
3
9
7
8
6
9
7
8
6
9
7
8
6
9
2BE 2BA 2AW 2AS 2AO 2AK 2AG 2AC 2Y 2U 2Q 2M
2E
2A
2I
2BH 2BD 2AZ 2AV 2AR 2AN 2AJ 2AF 2AB 2X 2T 2P
2H
2D
2L
2BG 2BC 2AY 2AU 2AQ 2AM 2AI 2AE 2AA 2W 2S 2O
2G
2C
2K
2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z
2V 2R 2N
2F
2B
2J
1871-1U-06B(01-02).fm 133 ページ 2006年3月15日 水曜日 午前10時32分
ON-BOARD DIAGNOSTIC [L3 WITH TC]
01-02–134
Diagnostic procedure
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has the FREEZE FRAME DATA been
recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA on the repair order, then go
to the next step.
2
VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Bulletins and/or on-
line repair information availability.
• Is any related repair information available?
Yes
Perform the repair or diagnosis according to the available
repair information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT EGR VALVE CONNECTOR FOR POOR
CONNECTION
• Turn the ignition switch off.
• Disconnect the EGR valve connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminals and/or connector, then go
to Step 10.
No
Go to the next step.
4
INSPECT POWER CIRCUIT FOR OPEN CIRCUIT
• Turn ignition switch to the ON position (Engine
off).
• Measure the voltage following the terminal and
body ground.
— EGR valve terminal C (harness-side)
— EGR valve terminal D (harness-side)
• Is voltage B+?
Yes
Go to the next step.
No
Repair or replace the wiring harness for an open circuit
then go to Step 10.
5
INSPECT EGR VALVE
• Perform the EGR valve inspection.
(See01-16-12 EGR VALVE INSPECTION[L3
WITH TC].)
• Is the EGR valve normal?
Yes
Go to the next step.
No
Replace the EGR valve, then go to Step 10.
6
INSPECT FOR CONTROL CIRCUIT FOR SHORT
TO GROUND
• Turn the ignition switch off.
• Inspect for continuity between the following
terminals and body ground:
— EGR valve terminal E (harness-side)
— EGR valve terminal A (harness-side)
— EGR valve terminal B (harness-side)
— EGR valve terminal F (harness-side)
• is there continuity?
Yes
Repair or replace the wiring harness for a short to ground,
then go to Step 10.
No
Go to the next step.
7
INSPECT FOR CONTROL CIRCUIT FOR SHORT
TO POWER SUPPLY
• Turn the ignition switch to the ON position
(Engine off).
• Measure the voltage between the following
terminals and body ground:
— EGR valve terminal E (harness-side)
— EGR valve terminal A (harness-side)
— EGR valve terminal B (harness-side)
— EGR valve terminal F (harness-side)
• Is voltage B+?
Yes
Repair or replace wiring harness for a short to power
supply, then go to Step 10.
No
Go to the next step.
8
INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn the ignition switch off.
• Disconnect PCM connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminals and/or connector, then go
to Step 10.
No
Go to the next step.
1871-1U-06B(01-02).fm 134 ページ 2006年3月15日 水曜日 午前10時32分
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