TOYOTA T100 1996 Factory Service Manual

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Z04351
Connector
3 2
1
4
− AIR CONDITIONINGTHERMISTOR
AC−71
2005 Author: Date:
1996 TOYOTA T100 (RM449U)
THERMISTOR
ON−VEHICLE INSPECTION
1. REMOVE GLOVE COMPARTMENT DOOR
(See page BO−36)
2. INSPECT THERMISTOR RESISTANCE
(a) Disconnect the connector
(b) Measure resistance between terminals 2 and 4.
Standard resistance: 1,500 Ω at 25 °C (77°F)
If resistance is not as specified, proceed next inspection.

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I01457
AC−72
− AIR CONDITIONINGTHERMISTOR
1996 TOYOTA T100 (RM449U)
REMOVAL
1. REMOVE EVAPORATOR
(See page AC−53)
2. REMOVE THERMISTOR
(a) Disconnect the connector.
(b) Pull out the thermistor from evaporator.

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I03338
Thermometer
Ice
ThermistorOhmmeter
10 cm
(0.39 in.)
Z04352
5,000
500
0
0 4,500
4,000
3,500
3,000
2,500
2,000
1,500
1,000
51015 2025
32 41 50 59 68 77 (Ω)
(°C)
(°F)
− AIR CONDITIONINGTHERMISTOR
AC−73
1996 TOYOTA T100 (RM449U)
INSPECTION
INSPECT THERMISTOR RESISTANCE
(a) Place the thermistor in cold water, and while changing the
temperature of the water, measure resistance at the con-
nector and at the same time, measure temperature of the
water with a thermometer.
(b) Compare the 2 readings on the chart.
If resistance value is not as specified, replace the thermistor.

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AC−74
− AIR CONDITIONINGTHERMISTOR
1996 TOYOTA T100 (RM449U)
INSTALLATION
Installation is in the reverse order of removal (See page AC−72).

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Z04350
Connector
3 21
4
Z13470
Low Pressure High Pressure
Side Side
ON (Continuity)
3,140 kpa 196 kpa
(2.0 kgf/cm
2,28psi)
OFF (No Continuity)(32.0 kgf/cm2,455psi)
OFF (No Continuity)
− AIR CONDITIONINGPRESSURE SWITCH
AC−75
2009 Author: Date:
1996 TOYOTA T100 (RM449U)
PRESSURE SWITCH
ON−VEHICLE INSPECTION
1. SET ON MANIFOLD GAUGE SET
(See page AC−17)
2. REMOVE GLOVE COMPARTMENT DOOR
(See page BO−36)
3. DISCONNECT CONNECTOR FROM COOLING UNIT
4. SET VEHICLE IN THESE CONDITIONS:
(a) Running engine at 2,000 rpm
(b) Blower speed control switch at HI
(c) Temperature control lever MAX. COOL
(d) A/C switch ON
5. INSPECT PRESSURE SWITCH OPERATION
(a) Connect the positive (+) lead from the ohmmeter to termi-
nal 1 and negative (−) lead to terminal 3.
(b) Check continuity between terminals when refrigerant
pressure is changed, as shown in the illustration.
If operation is not as specified, replace the pressure switch.

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I01456
AC−76
− AIR CONDITIONINGPRESSURE SWITCH
1996 TOYOTA T100 (RM449U)
REMOVAL
1. REMOVE EVAPORATOR (See page AC−53)
2. REMOVE PRESSURE SWITCH FROM LIQUID TUBE
Disconnect the connector and remove the pressure switch.
Torque: 10 N·m (100 kgf·cm, 7 ft·lbf)
HINT:
Lock the switch mounted on the tube with an open end
wrench, being careful not to deform the tube and remove
the switch.
At the time of installation, please refer to the following
item.
Lubricate a new O−ring with the compressor oil and install
the switch.

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− AIR CONDITIONINGPRESSURE SWITCH
AC−77
1996 TOYOTA T100 (RM449U)
INSTALLATION
Installation is in the reverse order of removal (See page AC−76).

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34 5
2 134 5
12AC0GI−01
AC−78
− AIR CONDITIONINGHEATER MAIN RELAY
2012 Author: Date:
1996 TOYOTA T100 (RM449U)
HEATER MAIN RELAY
INSPECTION
INSPECT HEATER MAIN RELAY (Making: HTR) CONTINU-
ITY
ConditionTester connectionSpecified condition
Constant2 − 4
3 − 5Continuity
Apply B+ between
terminals 3 and 51 − 2Continuity
If continuity is not as specified, replace the relay.

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Wire Harness SideAC0GJ−02
Z14604
From Back Side
− AIR CONDITIONINGAIR CONDITIONING AMPLIFIER
AC−79
2013 Author: Date:
1996 TOYOTA T100 (RM449U)
AIR CONDITIONING AMPLIFIER
ON−VEHICLE INSPECTION
INSPECT AMPLIFIER CIRCUIT
(a) Remove the glove compartment door
(See page BO−36).
(b) Disconnect the amplifier connector and inspect the con-
nector on wire harness side, as shown in the chart below.
Test conditions:
Temperature control lever MAX. COOL
A/C switch ON
Turn ignition switch to ON
Blower speed switch at HI
Tester connectionConditionSpecified condition
8 − GroundConstantContinuity
2 − 6ConstantContinuity
2 − 10Evaporator temperature at 25 °C (77 °F)Approx. 1.5 kΩ at 25 °C (77 °F)
4 − GroundA/C switch ONBattery positive voltage
4 − GroundA/C switch OFFNo voltage
1 − ECM terminal ACTConstantContinuity
9 − ECM terminal AC1ConstantContinuity
7 − GroundA/C switch ONContinuity
7 − GroundA/C switch OFFNo continuity
If the circuit is not as specified, inspect the circuits connected
to other parts.
(c) Connect the connector to amplifier and inspect wire har-
ness side connector from the back side, as shown in the
chart below.
Test conditions
Running engine at idle speed
Blower speed switch at ”HI” position
A/C switch ON
Temperature control lever at ”COOL” position
Set on manifold gauge set
Tester connectionConditionSpecified condition
3 − GroundRefrigerant pressure 196 − 1,340 kPaBattery positive voltage
3 − GroundRefrigerant pressure
less than 196 or more than 3,140 kPaNo 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.

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N09337
AC−80
− AIR CONDITIONINGAIR CONDITIONING AMPLIFIER
1996 TOYOTA T100 (RM449U)
REMOVAL
1. REMOVE GLOVE COMPARTMENT DOOR
(See page BO−36)
2. REMOVE A/C AMPLIFIER
(a) Disconnect the connector.
(b) Remove the amplifier from the cooling unit.