Mazda 3 - Page 143

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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143
VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED
• Has FREEZE FRAME DATA been
recorded?
No
Record the FREEZE FRAME DATA on the
repair order, then go to the next step.
2
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
• Verify related service repair information
availability.
• Is any related repair information
available?
Yes
Perform 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
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?
Yes
Go to the appropriate DTC inspection.
(See DTC TABLE [Z6].)
No
Go to the next step.
4
INSPECT GAS LEAKAGE OF EXHAUST
SYSTEM
• Visually inspect exhaust gas leakage in
exhaust system.
• Is there gas leakage?
Yes
Repair or replace the malfunctioning exhaust
parts, then go to Step 7.
No
Go to the next step.
5
INSPECT INSTALLATION OF FRONT
HO2S AND REAR HO2S
• Inspect the front HO2S and rear HO2S
for looseness.
• Is it normal?
Yes
Go to the next step.
No
Retighten the sensor, then go to Step 7.
(See FRONT HEATED OXYGEN SENSOR
(HO2S) REMOVAL/INSTALLATION [Z6].)
(See REAR HEATED OXYGEN SENSOR
(HO2S) REMOVAL/INSTALLATION [Z6].)
6
INSPECT TWC
• Clear the DTC from the PCM memory
using the WDS or equivalent.
• Turn the ignition switch off then to the
ON position.
• Inspect the TWC.
• Is it normal?
Yes
Replace the HO2S, then go to the next step.
(See FRONT HEATED OXYGEN SENSOR
(HO2S) REMOVAL/INSTALLATION [Z6].)
(See REAR HEATED OXYGEN SENSOR
(HO2S) REMOVAL/INSTALLATION [Z6].)
No
Replace the TWC, then go to the next step.
(See EXHAUST SYSTEM
REMOVAL/INSTALLATION [Z6].)
7
VERIFY TROUBLESHOOTING OF DTC
P0420 COMPLETED
• Make sure to reconnect all disconnected
connectors.
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [Z6].)
No
Go to the next step.