Mazda RX-8 Workshop Manual page 2556

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2011 - RX-8 - HVAC
NO.4 NO TEMPERATURE CONTROL WITH A/C AMPLIFIER [MANUAL AIR
CONDITIONER]
4 No temperature control with A/C amplifier.
DESCRIPTION
POSSIBLE
CAUSE
When performing an asterisked (*) troubleshooting inspection, shake the wiring harness
and connectors while performing the inspection to discover whether poor contact points
are the cause of any intermittent malfunctions. If there is a problem, check to make sure
connectors, terminals and wiring harnesses are connected correctly and undamaged.
Diagnostic procedure
STEP
1 INSPECT COOLANT TEMPERATURE
Is coolant sufficiently warmed up?
2 CHECK CIRCUITS COMMON TO BOTH AIR MIX
ACTUATOR AND AIRFLOW MODE ACTUATOR
Temperature does not change with operating temperature control dial.
Air mix actuator (+5 V signal) system malfunction (Steps 3—7, 10)
A/C amplifier (potentiometer GND signal) system malfunction (Steps 8, 9)
Air mix actuator (potentiometer input signal) system malfunction (Steps 11
—13)
Air mix actuator (potentiometer GND signal, motor drive signal) system
malfunction (Step 14)
Air mix actuator system malfunction (Steps 15, 16)
A/C unit air mix door malfunction (Steps 17, 18)
INSPECTION ACTION
YesGo to next step.
No Warm engine up, then go to Step 19.
YesGo to Step 10.