Mazda RX-8 Manual page 1698

NO.4 NO TEMPERATURE CONTROL WITH A/C AMPLIFIER
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 INSPECTION
INSPECT COOLANT TEMPERATURE
1
Is coolant sufficiently warmed up?
•
CHECK CIRCUITS COMMON TO BOTH AIR MIX
ACTUATOR AND AIRFLOW MODE ACTUATOR
2
Does airflow mode change when operating airflow
•
mode selector switch?
3
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)
•
ACTION
Yes Go to next step.
Warm engine up, then go to Step
No
19.
Yes Go to Step 10.
No Go to next step.
Yes Go to next step.
(w) RX-8 - HVAC
Page 69