Mazda CX-7 2007 Workshop Manual page 178

STEP
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Verify related Service Bulletins and/or on-line
repair information availability.
• Is any related repair information available?
3 VERIFY RELATED PENDING CODE OR
STORED DTC
• Turn the ignition switch off, then to the ON
position (Engine off).
• Verify the related PENDING CODE or stored
DTCs.
• Are other DTCs present?
4 INSPECT EXHAUST SYSTEM FOR EXHAUST
GAS LEAKAGE
• Visually inspect for exhaust gas leakage in the
exhaust system.
• Is there exhaust gas leakage?
5 INSPECT INSTALLATION OF FRONT AND
REAR HO2S
• Inspect the front and rear HO2S for looseness.
• Is it normal?
6 INSPECT TWC
• Clear the DTC using the M-MDS generic OBD
function.
• Turn the ignition switch off then back to the ON
position.
• Inspect the TWC.
(See01-16-14 WARM-UP THREE-WAY
CATALYTIC CONVERTER (WU-TWC)
INSPECTION[L3 WITH TC].)
• Is it normal?
7 VERIFY TROUBLESHOOTING OF DTC P0421
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn the ignition switch to the ON position
(Engine off).
• Clear the DTC from the memory using the M-
MDS.
• Perform the HO2S heater, HO2S, and TWC
Repair Verification Drive Mode.
(See01-02-10 OBD-II DRIVE MODE[L3 WITH
TC].)
• Is the PENDING CODE for this DTC present?
8 VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
(See01-02-10 AFTER REPAIR
PROCEDURE[L3 WITH TC].)
• Are any DTCs present?
End Of Sie
01-02–136
ON-BOARD DIAGNOSTIC [L3 WITH TC]
INSPECTION
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 Go to the applicable DTC inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No Go to the next step.
Yes Repair or replace the malfunctioning part, then go to Step
7.
No Go to the next step.
Yes Go to the next step.
No Retighten the sensor, then go to Step 7.
(See01-15-2 EXHAUST SYSTEM REMOVAL/
INSTALLATION[L3 WITH TC].)
Yes Replace the heated oxygen sensor, then go to the next
step.
No Replace the TWC, then go to the next step.
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.
Yes Go to the applicable DTC troubleshooting.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No Troubleshooting completed.
ACTION