Mazda RX-8 Manual page 117

Measure voltages at PCM terminal 4W, 4Z, 4F
(MT), 2O (MT) and TCM terminal 2E (AT).
(See PCM INSPECTION .)
(See TCM INSPECTION .)
Is the voltage normal?
4
If PCM terminal 4W voltage is not as
specified:
Inspect the A/C switch, refrigerant
pressure switch and the fan switch.
(See REFRIGERANT PRESSURE
SWITCH INSPECTION .)
(See CLIMATE CONTROL UNIT
INSPECTION .)
If PCM terminal 4Z voltage is not as
specified:
Inspect the refrigerant pressure switch
(medium pressure).
(See REFRIGERANT PRESSURE
SWITCH INSPECTION .)
If PCM terminal 4F voltage is not as
No
specified (MT):
Inspect the CPP switch.
(See CLUTCH PEDAL POSITION
(CPP) SWITCH INSPECTION .)
If PCM terminal 2O voltage is not as
specified (MT):
Inspect the neutral switch.
(See NEUTRAL SWITCH INSPECTION
.)
If TCM terminal 2E voltage is not as
specified (AT):
Inspect the TR switch.
(See TRANSMISSION RANGE (TR)
SWITCH INSPECTION .)
Yes Repair or replace parts if necessary.
(w) RX8-Engine Troubleshooting
Page 68