1996 TOYOTA LAND CRUISER Air conditioning amplifier

AC2QC−03
−
AIR CONDITIONING AIR CONDITIONING SYSTEM
AC−3
1996 LAND CRUISER (RM451U)
PROBLEM SYMPTOMS TABLE
Use the table below to help you find the cause of the problem.The numbers i\
ndicate the priority of the likely
cause of the problem. Check each part in order. If necessary, replace these parts.
SymptomSuspect AreaSee page
No blower operation
4. HTR Fuse
5. Heater main relay
6. Blower motor
7. Blower resistor
8. Blower speed control switch
9. Wire harness−
AC−64
AC−52
AC−57
AC−69 −
No air temperature control
1. Engine coolant volume
2. A/C control assembly
3. Water valve−
AC−69
AC−49
No compressor operation
1. Refrigerant volume
2. A.C Fuse
3. Magnetic clutch
4. Compressor
5. Pressure switch
6. Heater main relay
7. Blower speed control switch
8. A/C switch
9. A/C amplifier
10.Thermistor
11. Wire harnessAC−5 −
AC−33
AC−33
AC−61
AC−64
AC−69
AC−69
AC−74
AC−60 −
Compressor operates intermitently
1. Refrigerant volume
2. Pressure switch
3. A/C amplifier
4. Thermistor
5. Wire harnessAC−5
AC−61
AC−74
AC−60 −
No cool air comes out
1. Refrigerant volume
2. Refrigerant pressure
3. Drive belt
4. Magnetic clutch
5. Compressor
6. Pressure switch
7. Thermistor
8. A/C switch
9. A/C amplifier
10.A/C control assembly
11. Wire harnessAC−5
AC−5
AC−15
AC−33
AC−33
AC−61
AC−60
AC−69
AC−74
AC−69 −
Cool air comes out only at high engine rpm
1. Refrigerant volume
2. Drive bel
3. Magnetic clutch
4. Compressor
5. Condenser
6. Receiver
7. Expansion valve
8. Evaporator
9. Thermistor
10.A/C amplifier
11. Wire harnessAC−5
AC−15
AC−33
AC−33
AC−42
AC−39
AC−47
AC−45
AC−60
AC−74 −
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AC−4
−
AIR CONDITIONING AIR CONDITIONING SYSTEM
1996 LAND CRUISER (RM451U)
Insuf
ficient cooling
1. Refrigerant volume
2. Drive belt
3. Magnetic clutch
4. Compressor
5. Condenser
6. Receiver
7. Expansion valve
8. Evaporator
9. Refrigerant line
10.Pressure switch
11. A/C amplifier
12.A/C control assemblyAC−5
AC−15
AC−33
AC−33
AC−42
AC−39
AC−47
AC−45
AC−20
AC−61
AC−74
AC−69
No engine idle up when A/C switch ON
1. A/C amplifier
2. ECM
3. Wire harnessAC−74 −
−
No warm air comes out
1. Engine coolant volume
2. A/C control assembly
3. Water valve
4. Heater radiator−
AC−69
AC−49
AC−46
A/C indicator does not light up when mode lever at DEF. position
1. Defroster mode switch
2. A/C switch
3. Wire harnessAC−69
AC−69 −
Rear heater:
SymptomSuspect AreaSee page
No blower operation
1. RR HTR Fuse
2. Rear heater relay
3. Rear heater switch
4. Rear blower motor
5. Rear blower resistor−
AC−65
AC−77
AC−55
AC−58
No warm air come out1. Engine coolant volume
2. Rear heater radiator−
AC−46
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AC2QP−01
N06174
Hexagonal WrenchExpansion Valve
−
AIR CONDITIONING COOLING UNIT
AC−25
1996 LAND CRUISER (RM451U)
DISASSEMBLY
1. REMOVE A/C AMPLIFIER
2. REMOVE RELAY
3. REMOVE WIRE HARNESS
4. REMOVE BLOWER RESISTOR
Remove the 2 screws and blower resistor.
5. SEPARATE UPPER AND LOWER UNIT CASES
(a) Using a knife, cut off the each packing.
(b) Remove 3 clips and 4 screws.
(c) Separate the upper and lower unit cases.
6. REMOVE EVAPORATOR FROM LOWER UNIT CASE
HINT:
If the evaporator was replaced, add compressor oil to the com-
pressor.
Add 40 cc (1.4 fl.oz.)
Compressor oil:
ND−OIL 8 or equivalent
7. REMOVE THERMISTOR
Pull out the thermistor from the evaporator.
8. REMOVE EXPANSION VALVE
Using a hexagon wrench, remove the 2 bolts and separate the
expansion valve and evaporator. Torque: 5.4 N·m (55 kgf·cm, 48 in.·lbf)
HINT:
At the time of reassembly, lubricate 4 new O−rings with com-
pressor oil and install the tubes.
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AC2SI−01
AC−74
−
AIR CONDITIONING AIR CONDITIONING AMPLIFIER
1401
Author: Date:
1996 LAND CRUISER (RM451U)
AIR CONDITIONING AMPLIFIER
ON−VEHICLE INSPECTION
INSPECT AMPLIFIER CIRCUIT
(a) Disconnect the amplifier and inspect the connector on the
wire harness side, as shown in the chart below.
Test conditions:
Ignition switch ON
A/C switch ON
Temperature control lever MAX COOL
Blower control switch HI
Tester connectionConditionSpecifeid condition
6 − GroundConstantContinuity
8 − 9ConstantContinuity
9 − 6ConstantApprox. 1.5 k Ω at 25 ° C (77 °F)
2 − GroundA/C switch ONBattery positive voltage
2 − GroundA/C switch OFFNo voltage
5 − GroundStart engineApprox. 10 to 14 v
5 − GroundStop engineNo voltage
If circuit is as specified, try replacing the amplifier with a new
one. If the circuit is not as specified, inspect the circuits con-
nected to other parts.
(b) Connect the connector to A/C amplifier and inspect wire
harness side connector from the back side, as shown in
the chart below.
Test conditions:
Ignition switch ON
A/C switch ON
Temperature control lever MAX COOL
Blower control switch HI
Tester connectionConditionSpecified Condition
3 − GroundRefrigeration pressure
2.0 − 32 kgf/cm3Battery positive voltage
3 − GroundRefrigeration pressure
less than 2.0 − 32 kgf/cm3 or moreNo voltage
If circuit is not as specified, replace the amplifier.
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N14294
AC2SJ−01
−
AIR CONDITIONING AIR CONDITIONING AMPLIFIER
AC−75
1996 LAND CRUISER (RM451U)
REMOVAL
1. REMOVE GLOVE COMPARTMENT DOOR
(See page BO−76 )
2. REMOVE A/C AMPLIFIER
(a) Disconnect the connector from the amplifier.
(b) Remove the screw and the amplifier.
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AC2SK−01
AC−76
−
AIR CONDITIONING AIR CONDITIONING AMPLIFIER
1996 LAND CRUISER (RM451U)
INSTALLATION
Installation is in the reverse order of removal See page AC−75).
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Version 1.11 - 03/16/2010