Additional (Condenser) Fan Does Not Operate - Mazda MX-5 1990 Workshop Manual

TROUBLESHOOTING GUIDE
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Symptom: Additional (condenser) fan does not operate.
Note
• If the magnetic clutch also does not operate, see "Magnetic clutch does not operate"; page
U-9.
Normal operation of additional fan
The additional fan is supplied with battery voltage as shown:
1. A/C and blower switches are turned ON.
2. ECU receives signal that A/C and blower switches are ON and creates ground circuit.
3. A/C relay is magnetized and contact is closed.
4. Battery voltage is applied to additional fan and fan operates.
Note
• The ECU also controls the additional fan and magnetic clutch operation depending on engine
load. (Refer to Section F.)
(B) (B/L)
rn
05UOUX·019
05UOUX-018
Remedy
1. Measure the voltage at the terminal-wire(s) of the addition-
al fan.
Wire
Voltage Action
(BtL) 12V
Next, check wire (6)
OV
Repair wire (B/L)
(Ale relay-Additional fan)
(8) 12V
Repair wire (8)
(Additional fan-Body ground)
OV Replace additional fan
•
U-11