Mazda 3 Workshop Manual page 269

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
INSPECT REAR HO2S TERMINAL
• Turn the ignition switch off.
• Disconnect the rear HO2S connector.
3
• Inspect for poor connection (such as
damaged/pulled out pins, corrosion).
• Is there any malfunction?
INSPECT REAR HO2S HEATER
• Inspect rear HO2S heater.
4
(See REAR HEATED OXYGEN SENSOR
(HO2S) INSPECTION
• Is rear HO2S heater normal?
INSPECT PCM TERMINAL
• Disconnect the PCM connector.
5
• Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
• Is there any malfunction?
INSPECT REAR HO2S HEATER CONTROL
CIRCUIT FOR SHORT TO POWER SUPPLY
• Turn the ignition switch to the ON position
(Engine off).
6
• Measure the voltage between rear HO2S
terminal D (wiring harness-side) and body
ground.
• Is the voltage B+?
VERIFY TROUBLESHOOTING OF DTC
P0038 COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the PCM memory using
7
the WDS or equivalent.
• Perform the HO2S heater, HO2S, and TWC
Repair Verification Drive Mode. (See
DRIVE MODE [LF].)
• Is the PENDING CODE for this DTC present?
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
8
(See AFTER REPAIR PROCEDURE
• Are any DTC present?
Downloaded from
[LF].)
OBD
[LF].)
https://carmanualshub.com/
Repair or replace the terminal, then go to
Yes
Step 7.
No Go to the next step.
Yes Go to the next step.
No Replace the rear HO2S, then go to Step 7.
Yes Repair the terminal, then go to Step 7.
No Go to the next step.
Repair or replace the wiring harness for
Yes shot to power circuit, then go to the next
step.
No Go to the next step.
Replace the PCM, then go to the next step.
Yes
(See PCM REMOVAL/INSTALLATION
[LF].)
No Go to the next step.
Go to the applicable DTC troubleshooting.
Yes
(See DTC TABLE [LF].)
No Troubleshooting completed.
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