Mazda RX-8 Manual page 634

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 MAF/IAT SENSOR
CONNECTOR FOR POOR CONNECTION
Turn the ignition switch off.
•
Disconnect the MAF/IAT sensor
•
3
connector.
Inspect for poor connection (such as
•
damaged/pulled-out pins, corrosion).
Is there any malfunction?
•
INSPECT IAT SENSOR SIGNAL CIRCUIT
FOR SHORT TO POWER SUPPLY
Turn the ignition switch to the ON
•
position (Engine off).
4
Measure the voltage between
•
MAF/IAT sensor terminal D (wiring
harness-side) and body GND.
Is the voltage B+ ?
•
INSPECT IAT SENSOR
Inspect the IAT sensor.
•
5
(See INTAKE AIR TEMPERATURE
(IAT) SENSOR INSPECTION .)
Is there any malfunction ?
•
6
ACTION
Yes Go to the next step.
Record the FREEZE FRAME DATA on the repair
No
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 8.
No Go to the next step.
Repair or replace the wiring harness for a possible
Yes
short to power supply, then go to Step 8.
No Go to the next step.
Replace the MAF/IAT sensor, then go to Step 8.
Yes (See MASS AIR FLOW (MAF)/INTAKE AIR
TEMPERATURE (IAT) SENSOR
REMOVAL/INSTALLATION .)
No Go to the next step.
Yes Repair or replace the terminal, then go to Step 8.
(w) Engine Diagnostics & Control
Page 71