Page 1657 of 2000

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–29
AC
TERMINALS OF ECU
(2006/01- )
1. CHECK AIR CONDITIONING AMPLIFIER
(a) Measure the voltage and resistance of the
connectors.
HINT:
Check from the rear of the connector while it is
connected to the air conditioning amplifier.
E115964E03
Symbols (Terminal No.) Wiring Color Terminal Description ConditionSpecified Condition
B (E37-21) - GND (E37-
14)R - W-B Power source (Back-up) Always 10 to 14 V
SOL+ (E37-2) - GND
(E37-14)GR - W-BA/C compressor operation
signalEngine idling
Pulse generation
(see waveform 1) Blower switch LO
A/C switch ON
BLW (E37-23) - GND
(E37-14)R - W-BBlower motor control
signalIgnition switch ON
Pulse generation
(see waveform 2)
Blower switch LO
PRE (E37-9) - SG-2 (E37-
13)L - GAir conditioning pressure
sensor signalRefrigerant pressure:
Normal0.76 to 4.74 V
PRE (E37-9) - SG-2 (E37-
13)L - GAir conditioning pressure
sensor signalRefrigerant pressure:
Abnormal (less than 0.196
MPa [2.0 kgf/cm
2, 28 psi]) Below 0.76 V
PRE (E37-9) - SG-2 (E37-
13)L - GAir conditioning pressure
sensor signalRefrigerant pressure:
Abnormal (more than 3.14
MPa [32 kgf/cm
2, 455 psi])4.74 V or higher
TSD (E37-33) - S5-4 (E37-
31)L - LGDriver side solar sensor
signalIgnition switch ON
0.8 to 4.3 V
Solar sensor subject to
electric light
TSP (E37-32) - S5-4 (E37-
31)P - LGPassenger side solar
sensor signalIgnition switch ON
0.8 to 4.3 V
Solar sensor subject to
electric light
TR (E37-29) - SG-1 (E37-
34)CR - VRoom temperature sensor
signalIgnition switch ON
1.8 to 2.2 V
Vehicle interior
temperature: 25
C (77F)
SG-1 (E37-34) - Body
groundV - Body groundGround for room
temperature sensorAlways Below 1
GND (E37-14) - Body
groundW-B - Body groundGround for main power
supplyAlways Below 1
IG+ (E37-1) - GND (E37-
14)Y - W-B Power source (IG) Ignition switch ON 10 to 14 V
S5-3 (E37-10) - GND
(E37-14)B - W-BPower supply for pressure
sensorIgnition switch ON 4.5 to 5.5 V
CANH (E37-11) - GND
(E37-14)V - W-B Hi-level CAN bus line Ignition switch ONPulse generation
(see waveform 3)
Page 1658 of 2000

AC–30AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
HINT:
*: for 2GR-FE
(b) Using an oscilloscope, check waveform 1.
A/C Compressor* operation signal
HINT:
*: Compressor and pulley for 2AZ-FE, Compressor
and magnetic clutch for 2GR-FE.
(c) Using an oscilloscope, check waveform 2.
Blower motor control signal
HINT:
When the blower level is increased, the duty ratio
changes accordingly.
CANL (E37-12) - GND
(E37-14)W - W-B Lo-level CAN bus line Ignition switch ONPulse generation
(see waveform 4)
SG-2 (E37-13) - Body
groundG - Body groundGround for pressure
sensorAlways Below 1
RDFG (E37-38) - GND
(E37-14)B - W-BRear defogger switch
signalIgnition switch ON
Rear defogger switch OFF10 to 14 V
RDFG (E37-38) - GND
(E37-14)B - W-BRear defogger switch
signalIgnition switch ON
Rear defogger switch ONBelow 1 V
LIN1 (E37-37) - GND
(E37-14)B - W-B LIN communication signal Ignition switch ON Pulse generation
BUS G (c1-2) - Body
ground- Ground for BUS IC Always Below 1
BUS (c1-3) - BUS G (c1-2) - BUS IC control signal Ignition switch ON Pulse generation
B BUS (c1-4) - BUS G (c1-
2)- Power supply for BUS IC Ignition switch ON 11 to 13 V
SGA (c1-5) - Body ground -Ground for evaporator
temperature sensorAlways Below 1
TEA (c1-6) - SGA (c1-5) -Evaporator temperature
sensor signalIgnition switch ON
1.4 to 1.8 V
Evaporator temperature:
15
C (59F)
LOCK (E37-8)* - SG-2
(E37-13)W - GCompressor lock sensor
signalIgnition switch ON
AUTO switch ON
A/C switch ON
Magnetic clutch ONPulse generation
(see waveform 5)
MGC (E37-20)* - GND
(E37-14)V - W-BMagnetic clutch relay
signalIgnition switch ON
Magnetic clutch OFF10 to 14 V
MGC (E37-20)* - GND
(E37-14)V - W-BMagnetic clutch relay
signalIgnition switch ON
Magnetic clutch ONBelow 1.5 V Symbols (Terminal No.) Wiring Color Terminal Description ConditionSpecified Condition
E074977E11
Item Content
Symbols (Terminal No.) SOL+ (E37-2) - GND (E37-14)
Tool Setting 5 V/DIV., 500
sec./DIV.
ConditionEngine idling, Blower switch LO, A/C
switch ON
E103396E05
Item Content
Symbols (Terminal No.) BLW (E37-23) - GND (E37-14)
Tool Setting 1 V/DIV., 500
sec./DIV.
Condition Ignition switch ON, Blower switch LO
Page 1659 of 2000

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–31
AC
(d) Using an oscilloscope, check waveform 3.
CAN communication signal
HINT:
The waveform varies depending on the CAN
communication signal.
(e) Using an oscilloscope, check waveform 4.
CAN communication signal
HINT:
The waveform varies depending on the CAN
communication signal.
(f) Using an oscilloscope, check waveform 5.
Compressor lock sensor signal*
HINT:
*: for 2GR-FE
2. CHECK AIR CONDITIONING CONTROL
(a) Measure the voltage and resistance of the
connectors.
A086154E10
Item Content
Symbols (Terminal No.) CANH (E37-11) - GND (E37-14)
Tool Setting 1 V/DIV., 10
sec./DIV.
Condition Ignition switch ON
A086155E11
Item Content
Symbols (Terminal No.) CANL (E37-12) - GND (E37-14)
Tool Setting 1 V/DIV., 10
sec./DIV.
Condition Ignition switch ON
E127551E01
Item Content
Symbols (Terminal No.) LOCK (E37-8)* - SG-2 (E37-13)
Tool Setting 500 mV/DIV., 20 msec./DIV.
ConditionIgnition switch ON, AUTO switch ON, A/
C switch ON, Magnetic clutch ON
E123518E01
Symbols (Terminal No.) Wiring Color Terminal Description ConditionSpecified Condition
IG+ (E23-2) - GND (E23-
7)L - W-B Power source (IG) Ignition switch ON 10 to 14 V
GND (E23-7) - Body
groundW-B - Body groundGround for air conditioning
control assemblyAlways Below 1
LIN1 (E23-11) - GND
(E23-7)B - W-B LIN communication signalIgnition switch ON Pulse generation
+B (E23-1) - GND (E23-7) R - W-B Power source (Back-up) Always 10 to 14 V
Page 1660 of 2000
AC–32AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
ACC (E23-8) - GND (E23-
7)GR - W-B ACC power supply Always Below 1
Symbols (Terminal No.) Wiring Color Terminal Description ConditionSpecified Condition
Page 1661 of 2000
AIR CONDITIONING – AIR MIX CONTROL SERVO MOTOR (for Automatic Air Conditioning
System)AC–215
AC
INSTALLATION
1. INSTALL AIR MIX CONTROL SERVO MOTOR (See
page AC-196)
2. INSTALL AIR CONDITIONING UNIT
(a) Install the air conditioning radiator (see page AC-
197).
Page 1662 of 2000

AIR CONDITIONING – COMPRESSOR AND PULLEY (for 2AZ-FE)AC–217
AC
INSTALLATION
1. ADJUST ADJUST COMPRESSOR OIL
(a) When replacing the compressor and magnetic
clutch with a new one, gradually discharge the
refrigerant gas from the service valve, and drain the
following amount of oil from the new compressor
and magnetic clutch before installation.
Standard:
(Oil capacity inside the new compressor and
magnetic clutch: 130 + 15 cc (4.6 + 0.51 fl.oz.) )
-(Remaining oil amount in the removed
compressor and magnetic clutch) = (Oil
amount to be removed from the new
compressor when replacing)
NOTICE:
• When checking the compressor oil level,
observe the precautions on the cooler
removal/installation.
• If a new compressor and magnetic clutch is
installed without removing some oil
remaining in the pipes of the vehicle, the oil
amount will be too large. This prevents heat
exchange in the refrigerant cycle and causes
refrigerant failure.
• If the volume of oil remaining in the removed
compressor and magnetic clutch is too small,
check for oil leakage.
• Be sure to use ND-OIL 8 or equivalent for
compressor oil.
2. INSTALL COOLER COMPRESSOR ASSEMBLY
(a) w/o Stud Bolt:
Install the cooler compressor with the 4 bolts.
Torque: 24.5 N*m (250 kgf*cm, 18 ft.*lbf)
NOTICE:
Tighten the bolts in the order shown in the
illustration to install the cooler compressor.
(b) w/ Stud Bolt:
Install the cooler compressor with the 3 bolts and
nut.
Torque: 24.5 N*m (250 kgf*cm, 18 ft.*lbf)
NOTICE:
Tighten the bolts in the order shown in the
illustration to install the cooler compressor.
(c) Connect the connector.
E134063E01
Page 1663 of 2000

AC–218AIR CONDITIONING – COMPRESSOR AND PULLEY (for 2AZ-FE)
AC
3. INSTALL NO. 1 COOLER REFRIGERANT
DISCHARGE HOSE
(a) Remove the attached vinyl tape from the hose.
(b) Sufficiently apply compressor oil to a new O-ring
and the fitting surface of the cooler compressor.
Compressor oil:
ND-OIL 8 or equivalent
(c) Install the O-ring on the cooler refrigerant discharge
hose.
(d) Install the cooler refrigerant discharge hose on the
cooler compressor with the bolt.
Torque: 9.8 N*m (100 kgf*cm, 7 ft.*lbf)
4. INSTALL NO. 1 COOLER REFRIGERANT SUCTION
HOSE
(a) Remove the attached vinyl tape from the hose.
(b) Sufficiently apply compressor oil to a new O-ring
and the fitting surface of the cooler compressor.
Compressor oil:
ND-OIL 8 or equivalent
(c) Install the O-ring on the cooler refrigerant suction
hose.
(d) Install the cooler refrigerant suction hose on the
cooler compressor with the bolt.
Torque: 9.8 N*m (100 kgf*cm, 7 ft.*lbf)
5. INSTALL FAN AND GENERATOR V BELT (See page
EM-7)
6. INSTALL NO. 1 ENGINE UNDER COVER
7. CONNECT CABLE TO NEGATIVE BATTERY
TERMINAL
8. CHARGE REFRIGERANT (See page AC-172)
9. WARM UP ENGINE (See page AC-173)
10. CHECK FOR LEAKAGE OF REFRIGERANT (See
page AC-173)
E131076
E126966
Page 1664 of 2000

AIR CONDITIONING – COMPRESSOR AND PULLEY (for 2GR-FE)AC–221
AC
INSTALLATION
1. INSTALL COOLER COMPRESSOR ASSEMBLY
(a) Install the cooler compressor with the 4 bolts.
Torque: 24.5 N*m (250 kgf*cm, 18 ft.*lbf)
NOTICE:
Tighten the bolts in the order shown in the
illustration to install the cooler compressor.
(b) Connect the connector.
2. CONNECT NO. 1 COOLER REFRIGERANT
DISCHARGE HOSE
(a) Remove the attached vinyl tape from the hose.
(b) Sufficiently apply compressor oil to a new O-ring
and the fitting surface of the cooler compressor.
Compressor oil:
ND-OIL 8 or equivalent
(c) Install the O-ring to the cooler refrigerant discharge
hose.
(d) Connect the cooler refrigerant discharge hose to the
cooler compressor with the bolt.
Torque: 9.8 N*m (100 kgf*cm, 7 ft.*lbf)
3. CONNECT NO. 1 COOLER REFRIGERANT SUCTION
HOSE
(a) Remove the attached vinyl tape from the hose.
(b) Sufficiently apply compressor oil to a new O-ring
and the fitting surface of the cooler compressor.
Compressor oil:
ND-OIL 8 or equivalent
(c) Install the O-ring to the cooler refrigerant suction
hose.
(d) Connect the cooler refrigerant suction hose to the
cooler compressor with the bolt.
Torque: 9.8 N*m (100 kgf*cm, 7 ft.*lbf)
4. INSTALL FAN AND GENERATOR V BELT (See page
EM-8)
5. CONNECT CABLE TO NEGATIVE BATTERY
TERMINAL
6. CHARGE REFRIGERANT (See page AC-172)
7. WARM UP ENGINE (See page AC-173)
8. CHECK FOR LEAKAGE OF REFRIGERANT (See
page AC-173)
H102369E01
H102036
H102039