Mazda 3 Workshop Manual page 266

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
1
• Has FREEZE FRAME DATA been recorded?
VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Verify related service repair information
2
availability.
• Is any related repair information available?
INSPECT POOR CONNECTION OF REAR
HO2S CONNECTOR
• 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 the rear HO2S heater.
4
(See REAR HEATED OXYGEN SENSOR
(HO2S) INSPECTION
• Is rear HO2S heater normal?
INSPECT REAR HO2S HEATER POWER
CIRCUIT FOR OPEN CIRCUIT
• Turn the ignition switch to the ON position
(Engine off).
5
• Measure the voltage between rear HO2S
terminal C (wiring harness-side) and body
ground.
• Is the voltage B+?
INSPECT POOR CONNECTION OF PCM
CONNECTOR
• Turn the ignition switch off.
• Disconnect the PCM connector.
6
• Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
• Is there any malfunction?
INSPECT REAR HO2S HEATER CONTROL
7
CIRCUIT FOR SHORT TO GROUND
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Yes Go to the next step.
Record the FREEZE FRAME DATA on the
No
repair order, then go to the next step.
Perform the repair or diagnosis according
to the available repair information.
Yes
• If the vehicle is not repaired, go to the
next step.
No Go to the next step.
Repair or replace the terminal, then go to
Yes
Step 9.
No Go to the next step.
Yes Go to the next step.
No Replace the rear HO2S, then go to Step 9.
Yes Go to the next step.
Repair or replace the wiring harness for
No
open circuit, then go to Step 9.
Yes Repair terminal, then go to Step 9.
No Go to the next step.
Repair or replace the wiring harness for
Yes
short to ground, then go to Step 9.
No Go to the next step.
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