Mazda CX-7 2007 Workshop Manual page 174

Diagnostic procedure
STEP
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?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Bulletins and/or on-
line repair information availability.
• Is any related repair information available?
3 INSPECT FOR OTHER DTCS
• Turn the ignition switch off then to the ON
position (Engine off).
• Have other DTCs been stored?
4 INSPECT VACUUM HOSE CONDITION
• Inspect freezing vacuum hoses for clogs,
damage, frozen, or vacuum leakage.
• Is there any malfunction?
5 INSPECT EGR VALVE MALFUNCTION
• Inspect the EGR valve.
(See01-16-12 EGR VALVE INSPECTION[L3
WITH TC].)
• Is the EGR valve normal?
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?
7 INSPECT EGR VALVE PASSAGE
• Turn the ignition switch off.
• Remove the EGR valve.
• Is the gasket installation normal?
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?
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?
10 VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
(See01-02-10 AFTER REPAIR
PROCEDURE[L3 WITH TC].)
• Are any DTCs present?
01-02–132
ON-BOARD DIAGNOSTIC [L3 WITH TC]
INSPECTION
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.
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.
Yes Repair the circuit malfunction for applicable DTCs.
No Go to the next step.
Yes Replace the vacuum hoses, then go to Step 8.
No Go to the next step.
Yes Go to the next step.
No Replace the EGR valve, then go to Step 8.
Yes Go to the next step.
No Replace the MAP sensor, then go to Step 8.
Yes Go to the next step.
No Install the gasket correctly, then go to the next step.
Yes Go to the next step.
No Retry this step.
Yes Go to the next step.
No Replace the PCM, then go to the next step.
Yes Go to the applicable DTC inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No Troubleshooting completed.
ACTION