AIR CONDITIONING
06 - Symptom Troubleshooting
SG06-3
TC070-15-01H
8 No cool air (DESCRIPTION: Magnetic clutch does not operate.)
Among the nine troubleshooting items indicated on the previous page, we see the
item No. 8 to learn how to diagnose Air Conditioner.
Preparatory study
As it’s given the description “Magnetic clutch does not operate”, the trouble is with an
electrical/electronic device. See the Magnetic clutch circuit below. The magnetic
clutch is activated when the PCM ground the coil inside the A/C relay to close the
contact of the relay. Magnetic clutch is grounded through its body; an open circuit
between Magnetic clutch and ground is unlikely occurred. If the magnetic clutch
doesn’t operate with battery voltage applied through the A/C relay, the magnetic
clutch may be faulty. Thermal protector inside the Magnetic clutch opens the circuit
when its temperature is approximately 120 ºC or more.
Look at the diagram above; predict the voltage at each terminal given in the table
below during each status.
Status
Part name Terminal
IG switch OFF
IG switch ON
PCM ground the coil
inside A/C relay
A
V
V
V
E
V
V
V
C
V
V
V
A/C relay
D
V
V
V
Magnetic
clutch
A
V
V
V
Summary of Contents for TC070-15-01H
Page 12: ...AIR CONDITIONING SG01 Basic System SG01 2 TC070 15 01H A C Components Name the components...
Page 23: ...AIR CONDITIONING SG01 Basic System SG01 13 TC070 15 01H Review Exercise 1 Name the components...
Page 55: ...AIR CONDITIONING SG02 Control System Manual Air Conditioning SG02 17 TC070 15 01H Cont d...
