TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION55-68
CHECK AT ECU TERMINAL M1552010300538
21
78
6 534
11
10912
AC304990
AB
Terminal No. Check item Checking requirement Normal condition
1 Output to the engine-A/T-ECU
(A/C1)A/C stopped 0 V
•A/C switch: ON
•Blower switch: ONSystem voltage
2 Output to the engine-A/T-ECU
(A/C2)When the A/C is under low load System voltage
When the A/C is under high
load0 V
3 Earth Always 0 V
4 Earth to the air thermo sensor Always 0 V
5 Power supply to the A/C
illuminationLighting switch: ON System voltage
6 Air thermo sensor (outlet side) Sensor probe temperature 25°C
(1.5k ohm)2.2 V
7 Power supply to the ignition
switch (IG2)Ignition switch: ON System voltage
8 Blower switch (lo) blower switch: lo System voltage
9 Rear defogger switch Defogger switch: ON 0 V
Defogger switch: OFF System voltage
10 Inside/outside air selection
damper motor (outside air)When the damper is moved to
the inside air recirculation
position0 V
When the damper is moved to
the outside air inside air intake
positionSystem voltage
11 Inside/outside air selection
damper motor (inside air)When the damper is moved to
the inside air recirculation
positionSystem voltage
When the damper is moved to
the outside air inside air intake
position0 V
12 Earth to the A/C illumination Always 0 V
COMPRESSOR ASSEMBLY AND TENSION PULLEY
HEATER, AIR CONDITIONER AND VENTILATION55-95
>>B<< SNAP RING INSTALLATION
Using snap ring pliers, fit the snap ring so that the
snap ring’s tapered part is on the outside.
>>C<< SELF-LOCKING NUT
INSTALLATION
Use the special tools to install the self-locking nut.
•Special spanner (MB991367)
•Pin (MB991386)
>>D<< AIR GAP ADJUSTMENT
Check that the clutch air gap is inside the standard
value. If outside the standard value, use a shim to
adjust the gap.
Standard value: 0.3 − 0.5 mm
INSPECTIONM1552014300950
REFRIGERANT TEMPERATURE SWITCH
CAUTION
Do not heat more than necessary.
1. Dip the metal part of the cooling temperature
switch into engine oil and increase the oil
temperature using a gas burner or similar.
2. When the oil temperature reaches the standard
value, check that voltage is supplied between the
terminals.
Standard value:
NOTE: When the oil temperature is 150
°C or
more and there is no continuity, the resistance will
not be 2
Ω or lower until the oil temperature
reduces to 120
°C or less.
AC001412
Snap ring
RotorClutch coil
Tapered part
AB
AC100633AB
MB991386
MB991367
AC100637AB
Thickness
gauge
Item Temperature
Less than 2
ohmsSlightly below 150°C
No continuity 150°C or more
AC100787
Thermometer
Engine oil
AB
AC100810
Continuity
No continuity
Oil temperature
AD
120˚C150˚C
CENTRALIZED JUNCTION
CIRCUIT DIAGRAMS90-12
PASSENGER COMPARTMENT
AC207745
(Connected directly to battery positive terminal)
Front of vehicle26
AF
No. Power supply circuit Name Rated
capacity (A)Housing
colourLoad circuit
1 Ignition switch (IG1) Fuse 10 Red Capacitor and ignition coil
2 7.5 Brown ABS warning lamp, brake warning
lamp, charging warning lamp, check
engine warning lamp, column switch,
combination meter, ETACS-ECU, low
fuel warning lamp, oil pressure
warning lamp, SRS air bag warning
lamp, SRS-ECU and vehicle speed
sensor
3 7.5 Brown A/T control relay, combination meter,
engine-A/T-ECU, ETACS-ECU, input
shaft speed sensor, output shaft
speed sensor, rear combination lamp
and SRS-ECU
4
−−−
5 Ignition switch (IG2) 7.5 Brown A/C compressor relay, A/C-ECU,
blower relay, rear window defogger
relay, front-ECU, heated seat relay,
heater control unit and outside/inside
air selection damper control motor
6 Rear window
defogger relay7.5 Brown Remote controlled mirror
7 Ignition switch (ACC) 20 Yellow Front-ECU and windshield wiper
motor
8 Ignition switch (IG1) 7.5 Brown Engine-A/T-ECU, engine-ECU, fuel
pump relay (1) and fuel pump relay (2)
9 Ignition switch (ACC) 15 Blue Cigarette lighter
10
−−−
11 7.5 Brown Accessory socket relay and Remote
controlled mirror
12 Ignition switch (IG2) 7.5 Brown ABS-ECU
13 Ignition switch (ACC)
−−−
14 15 Blue ETACS-ECU and rear wiper motor
