Mazda RX-8 Workshop Manual page 233

Disconnect the ECT sensor connector.
Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
Is there any malfunction?
INSPECT ECT SENSOR SIGNAL CIRCUIT FOR
4
SHORT TO GROUND
ECT sensor connector is disconnected.
Turn the ignition switch off.
Inspect for continuity between ECT
sensor terminal A (wiring harness-side)
and body ground.
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 ECT SENSOR
6
Inspect the ECT sensor.
(See ENGINE COOLANT TEMPERATURE
(ECT) SENSOR INSPECTION [13B-
MSP].)
Is there any malfunction?
VERIFY TROUBLESHOOTING OF DTC P0117
7 COMPLETED
Make sure to reconnect all disconnected
connectors.
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 7.
No Go to the next step.
YesRepair or replace the connector and/or
terminals, then go to Step 7.
No Go to the next step.
YesReplace the ECT sensor, then go to the next
step.
(See ENGINE COOLANT TEMPERATURE (ECT)
SENSOR REMOVAL/INSTALLATION [13B-
MSP].)
No Go to the next step.
YesReplace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [13B-
MSP].)