Mazda RX-8 Workshop Manual page 2491

2 INSPECT A/C COMPRESSOR OPERATION
Start engine.
Turn A/C switch and fan switch
on.
Does A/C compressor operate?
3 INSPECT FOR DTC IN PCM
Inspect for DTCs related to the
PCM on-board diagnostic system.
Are any DTCs displayed?
4 INSPECT TO SEE WHETHER MALFUNCTION
IS IN A/C REQUEST SIGNAL OR ELSEWHERE
Does cool air blow out when
terminal 1M of A/C amplifier
connector (24-pin, A/C signal) is
grounded by a jumper wire?
5* INSPECT EVAPORATOR TEMPERATURE
SENSOR RELATED HARNESS
inspect following evaporator
temperature sensor wiring harness
(open or short circuit) and
connectors (corrosion, pulled out
pins).
Is there any malfunction?
6 INSPECT TO SEE WHETHER MALFUNCTION
IS IN EVAPORATOR TEMPERATURE SENSOR
OR A/C AMPLIFIER
A/C amplifier
terminal 2N and
evaporator
temperature
sensor terminal A
A/C amplifier
terminal 2F and
evaporator
temperature
sensor terminal B
and 2.
YesGo to Step 1 of troubleshooting index No.6.
No Go to next step.
YesGo to appropriate inspection procedure.
No Go to next step.
YesGo to the next step.
No Remove the jumper wire, then go to Step 7.
YesRepair or replace malfunctioning part
according to inspection result, then go to Step
19.
No Go to the next step.
YesReplace A/C amplifier, then go to Step 19.
(See A/C AMPLIFIER REMOVAL/INSTALLATION
[MANUAL AIR CONDITIONER].)