Mazda RX-8 Manual page 584

Diagnostic procedure
STEP INSPECTION
VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED
1
Has FREEZE FRAME DATA been
•
recorded?
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
Verify related Service Bulletins and/or
•
2
on-line repair information availability.
Is any related repair information
•
available?
INSPECT FRONT HO2S CONNECTOR FOR
POOR CONNECTION
Turn the ignition switch off.
•
Disconnect the front HO2S connector.
•
3
Inspect for poor connection (such as
•
damaged/pulled-out pins, and
corrosion).
Is there any malfunction?
•
INSPECT FRONT HO2S HEATER
CONTROL CIRCUIT FOR SHORT TO
POWER SUPPLY
Turn the ignition switch to the ON
•
4
position (Engine off).
Measure the voltage between front
•
HO2S terminal D (wiring harness-side)
and body GND.
Is the voltage B+ ?
•
INSPECT FRONT HO2S HEATER
Inspect the front HO2S heater.
•
5
(See FRONT HEATED OXYGEN
SENSOR (HO2S) INSPECTION .)
Is there any malfunction ?
•
ACTION
Yes Go to the next step.
Record the FREEZE FRAME DATA on the
No
repair order, then go to the next step.
Perform 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.
Yes Repair or replace the terminal, then go to Step 7.
No Go to the next step.
Repair or replace the wiring harness for a
Yes
possible short to power supply, then go to Step 7.
No Go to the next step.
Replace the front HO2S, then go to Step 7.
Yes
(See FRONT HEATED OXYGEN SENSOR
(HO2S) REMOVAL/INSTALLATION .)
No Go to the next step.
(w) Engine Diagnostics & Control
Page 21