Mazda RX-8 Workshop Manual page 252

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INSPECT A/F SENSOR CONNECTOR FOR POOR
3 CONNECTION
Turn the ignition switch off.
Disconnect the A/F sensor connector.
Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
Is there any malfunction?
INSPECT A/F SENSOR CIRCUIT FOR SHORT TO
4 GROUND
A/F sensor connector is disconnected.
Turn the ignition switch off.
Inspect for continuity between the
following circuits:
Is there continuity?
INSPECT PCM CONNECTOR FOR POOR
5 CONNECTION
Turn the ignition switch off.
Disconnect the PCM connector.
Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
Is there any malfunction?
INSPECT A/F SENSOR CIRCUIT FOR OPEN
6 CIRCUIT
A/F sensor and PCM connectors are
disconnected.
Turn the ignition switch off.
Inspect for continuity between the
following circuits:
A/F sensor terminal A
(wiring harness-side)
and body ground
A/F sensor terminal B
(wiring harness-side)
and body ground
No Go to the next step.
YesRepair or replace the connector and/or
terminals, then go to Step 8.
No Go to the next step.
YesIf the short to ground circuit could be detected:
Repair or replace the wiring
harness for a possible short to
ground.
If the short to ground circuit could not be
detected:
Replace the PCM (short to
ground in the PCM internal
circuit).
(See PCM
REMOVAL/INSTALLATION [13B-
MSP].)
Go to Step 8.
No Go to the next step.
YesRepair or replace the connector and/or
terminals, then go to Step 8.
No Go to the next step.
YesGo to the next step.
No Repair or replace the wiring harness for a
possible open circuit, then go to Step 8.