Mazda RX-8 Workshop Manual page 225

Turn the ignition switch off.
Disconnect the MAF/IAT sensor
connector.
Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
Is there any malfunction?
INSPECT IAT SENSOR
4
Inspect the IAT sensor.
(See INTAKE AIR TEMPERATURE (IAT)
SENSOR INSPECTION
Is there any malfunction?
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 IAT SENSOR SIGNAL CIRCUIT FOR
6
SHORT TO POWER SUPPLY
MAF/IAT sensor and PCM connectors
are disconnected.
Turn the ignition switch to the ON
position (engine off).
Measure the voltage between MAF/IAT
sensor terminal D (wiring harness-side)
and body ground.
Is the voltage more than 4.8 V?
INSPECT IAT SENSOR CIRCUIT FOR OPEN
7
CIRCUIT
MAF/IAT sensor and PCM connectors
are disconnected.
Turn the ignition switch off.
Inspect for continuity between the
following circuits:
[13B-MSP].)
MAF/IAT sensor
terminals, then go to Step 8.
No Go to the next step.
YesReplace the MAF/IAT sensor, then go to Step
8.
(See MASS AIR FLOW (MAF)/INTAKE AIR
TEMPERATURE (IAT) SENSOR
REMOVAL/INSTALLATION
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.
YesRepair or replace the wiring harness for a
possible short to power supply, 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 the next step.
[13B-MSP].)