Mazda RX-8 Manual page 989

VERIFY CURRENT INPUT SIGNAL
STATUS OF REAR HO2S
Connect the WDS or equivalent to the
•
DLC-2.
Start the engine and warm it up
•
completely.
Access the O2S12 PID.
•
Read the O2S12 PID under following
•
accelerator pedal condition (in PARK
or NEUTRAL).
More than 0.55 V when
accelerator pedal is suddenly
depressed (rich condition).
Less than 0.55 V just after
release of accelerator pedal
(lean condition)
Is the PID normal?
•
INSPECT PURGE SOLENOID VALVE
Inspect the purge solenoid valve.
•
6
(See PURGE SOLENOID VALVE
INSPECTION .)
Is there any malfunction?
•
INSPECT AIR SYSTEM OPERATION
Perform the "AIR System Inspection".
•
7
(See Secondary Air Injection (AIR)
System Inspection .)
Does AIR system operate properly?
•
INSPECT FUEL LINE PRESSURE
Perform the "FUEL LINE PRESSURE
•
INSPECTION".
8
(See FUEL LINE PRESSURE
INSPECTION .)
Is there any malfunction ?
•
INSPECT FUEL SYSTEM FOR FUEL
9
LEAKAGE
Visually inspect for the the gas leakage between
TWC and rear HO2S.
If there is no leakage, replace the rear
•
HO2S.
No
(See REAR HEATED OXYGEN SENSOR
(HO2S) REMOVAL/INSTALLATION .)
Then go to Step 21.
Replace the purge solenoid valve, then go to Step
21.
Yes
(See INTAKE-AIR SYSTEM HOSE ROUTING
DIAGRAM .)
No Go to the next step.
Yes Go to the next step.
Repair or replace malfunctioning part according to
the inspection results.
No
Then go to Step 21
Yes Go to the next step.
No Go to Step 10.
Repair or replace the malfunctioning part, then go
Yes
to Step 21.
(w) Engine Diagnostics & Control
Page 426