TOYOTA HIGHLANDER 2001 Service Repair Manual
Manufacturer: TOYOTA, Model Year: 2001, Model line: HIGHLANDER, Model: TOYOTA HIGHLANDER 2001Pages: 2572, PDF Size: 34.8 MB
Page 1281 of 2572
I40666
ON (Below 1.0 W) Low pressure side High pressure side
OFF
(10 kW or higher)OFF
(10 kW or higher) (2.0 kgfVcm
2, 28 psi) (32.0 kgfVcm2, 455 psi) 196 KPa 3,140 KPa
I41168
HP E61ECM
IK32
L G
1 A3
Pressure Switch
4
A
EH J2
J/CW-B
Dual
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 149
1339 Author: Date:
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DTC B1423/23 PRESSURE SWITCH CIRCUIT
CIRCUIT DESCRIPTION
The ECM and A/C amplifier communicate via BEAN.
The pressure switch sends the appropriate signals to the A/C
amplifier when the A/C refrigerant pressure drops too low or
rises too high. When the A/C amplifier receives these signals,
it outputs signals through the A/C amplifier to turn the magnet
clutch relay off and turns the magnetic clutch off.
DTC No.Detection ItemTrouble Area
B1423/23
Open in pressure sensor circuit.
Abnormal refrigerant pressure.
below 196 kPa (2.0 kg/cm
2, 28 psi)
over 3,140 kPa (32.0 kgf/cm2, 455 psi)
Pressure switch
Harness or connector between cooler refrigerant liquid pipe A
(pressure switch) and ECM
Multiplex communication circuit
Refrigerant pipe line
ECM
A/C amplifier assy
WIRING DIAGRAM
05ITX-02
Page 1282 of 2572
I40669
Pressure Switch Connector
Wire Harness View:
A3
05-1 150
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1340 Author: Date:
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INSPECTION PROCEDURE
1 INSPECT REFRIGERANT PRESSURE
(a) Set the manifold gauge.
(b) Read the manifold gauge pressure when these conditions are established.
Test conditions:
Temperature at the air inlet with the switch set at RECIRC is 30 to 35°C (86 to 95°F)
Engine running at 1,500 rpm
Blower speed control switch at ºHIº position
Temperature control dial at ºCOOLº position
Air conditioning switch ON
Fully open doors
Standard:
Pressure on high pressure side:
1.37 to 1.57 MPa (13.9 to 16.0 kgfVcm
2, 198 to 228 psi)
HINT:
If the refrigerant pressure is below 196 KPa (2.0 kgfVcm
2, 28 psi), the refrigerant amount in the air condition-
ing cycle may have decreased significantly for reasons such as a gas leakage.
NG INSPECT AND REPAIR AIR CONDITIONING
CYCLE
OK
2 CHECK AIR CONDITIONING OPERATION
(a) Disconnect the pressure switch connector.
(b) Connect terminals 1 and 4 of the connector of the pres-
sure switch on the vehicle wire harness side using a ser-
vice wire.
(c) Start the engine.
(d) Turn the air conditioning switch on and check that the
magnet clutch is turned on.
(e) Check that the magnet clutch is turned off when discon-
necting terminals 1 and 4 (that are connected in the prior
step).
OK:
Terminals 1 and 4 connected: magnet clutch is on
Terminals 1 and 4 disconnected: magnet clutch is off
NG Go to step 3
OK
REPLACE PRESSURE SWITCH
Page 1283 of 2572
I41169
A3
E6
Pressure Switch Connector
Front View:
ECM Connector
Wire Harness View:
HP
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05-1 151
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3 CHECK HARNESS AND CONNECTOR(PRESSURE SWITCH - ECM)
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
E6-1 (HP) - A3-1AlwaysBelow 1 W
A3-4 - Body groundAlwaysBelow 1 W
E6-1 (HP) - Body groundAlways10 kW or higher
A3-1 - Body groundAlways10 kW or higher
Result:
NGA
OK
(Checking from the PROBLEM SYMPTOMS TABLE)B
OK (Checking from the DTC)C
B PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE
C REPLACE AIRCONDITIONER AMPLIFIER ASSY
A
REPAIR OR REPLACE HARNESS OR CONNECTOR
Page 1284 of 2572
4
1
0
100%
TP terminal voltage (V)
Damper opening angle
I30342
A14
A/C Amplifier Assy
P
SB 1
S5-1SG-1
TP 1012
3 2
11
A11 A11
A11 O
AMH
13 14
A11A11
AMC B
GR 45
Y Y-GO P-L LG-R
IJ1
IJ1
IJ1
IJ1
IJ13
4
1
2 5 Air Mix Damper Servo Sub-assy 05-1 152
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DTC B1431/31 AIR MIX DAMPER POSITION SENSOR
CIRCUIT (PASSENGER SIDE)
CIRCUIT DESCRIPTION
This sensor detects the position of the air mix damper servo
sub-assy and sends the appropriate signals to the A/C amplifi-
er assy. The position sensor is built into the air mix servo sub-
assy.
DTC No.Detection ItemTrouble Area
B1431/31Short to ground or power source circuit in air mix damper posi-
tion sensor circuit.
Air mix damper position sensor.
Harness or connector between air mix damper servo sub-
assy and A/C amplifier assy.
A/C amplifier assy
WIRING DIAGRAM
05ITY-01
Page 1285 of 2572
I30331SG-1 (-)
TP (+)
A/C Amplifier Connector
Wire Harness View:
A11
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 153
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INSPECTION PROCEDURE
HINT:
In case of using the hand-held tester, start the inspection step 1 and in case of not using the hand-held
tester, start from step 2.
1 READ VALUE OF HAND-HELD TESTER
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the items below in the DATA LIST, and read the displays on the hand-held tester.
A C:
ItemMeasurement Item/Display
(Range)Normal ConditionDiagnostic Note
A/M DAMP POS-P
Air mix damper position
(Passenger side)
/min.:-5% max.:105%Changes depending on the set
temperature (Passenger side)-
A/M DAMP TARG-P
Air mix damper target position
(Passenger side)
/min.:-5% max.:105%Changes depending on the set
temperature (Passenger side)-
Result:
NGA
OK (Checking from the DTC)B
OK (Checking from the PROBLEM SYMPTOM TABLE)C
B REPLACE AIRCONDITIONER AMPLIFIER ASSY
C PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE (SEE
PAGE 05-1 129)
A
2 INSPECT AIRCONDITIONER AMPLIFIER ASSY(TP, SG-1)
(a) Remove the A/C amplifier assy with connectors still con-
nected.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connectionConditionSpecified condition
A11-10 (TP) -
A11-12 (SG-1)MAX. COOL3.5 to 4.5 V
A11-10 (TP) -
A11-12 (SG-1)MAX. WARM0.5 to 1.8 V
HINT:
As the set temperature increases, the voltage decreases grad-
ually without interruption.
OK REPLACE AIRCONDITIONER AMPLIFIER ASSY
NG
Page 1286 of 2572
I30157
Air Mix Damper Servo Sub-assy
Connector Wire Harness View:
A14
I30332
MAX. COOL MAX. WARM
I30161
3.4 - 6.2
0.8 - 1.6 Resistance (kW)
Arm position
MAX. COOL MAX. WARM
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3 INSPECT AIRMIX DAMPER SERVO SUB-ASSY
(a) Remove the air mix damper servo sub-assy.
(b) Measure resistance between terminals 1 and 2 of air mix
damper servo sub-assy connector.
Standard:
Tester connectionConditionSpecified condition
A14-1 - A14-2Always4.2 to 7.8 kW
(c) While operating air mix damper servo sub-assy as shown
in the procedure on page 05-1 160, measure resistance
between terminals 1 and 3 of air mix damper servo sub-
assy.
Standard:
Tester connectionConditionSpecified condition
A14-1 - A14-3MAX. COOL3.4 to 6.2 kW
A14-1 - A14-3MAX. WARM0.8 to 1.6 kW
HINT:
As the air mix damper servo sub-assy moves from cool side to
warm side, the resistance decreases gradually without interrup-
tion.
NG REPLACE AIRMIX DAMPER SERVO SUB-ASSY
OK
Page 1287 of 2572
I41014
A14
TP
S5-1 A/C Amplifier Connector
Wire Harness View:
A11
Air Mix Damper Servo Sub-assy
Wire Harness View:
SG-1
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4 CHECK HARNESS AND CONNECTOR(AIR MIX DAMPER SERVO SUB-ASSY - A/C
AMPLIFIER ASSY)
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
A11-1 1 (S5-1) - A14-1AlwaysBelow 1 W
A11-12 (SG-1) - A14-2AlwaysBelow 1 W
A11-10 (TP) - A14-3AlwaysBelow 1 W
A11-1 1 (S5-1) -
Body groundAlways10 kW or higher
A11-12 (SG-1) -
Body groundAlways10 kW or higher
A11-10 (TP) -
Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE AIRCONDITIONER AMPLIFIER ASSY
Page 1288 of 2572
TPO terminal voltage
(V)
4
1
0 100%
Damper opening angle
I30342
Mode Damper Servo Sub-assy
(Air Outlet Damper Position Sensor)A/C Amplifier Assy
1
S5-4 SG-4
TPO 6
8 3
2
7 A11
AOF
AOD 49 1
A11
A11
A11
A11 B
BR
R
V
G IL2
IL2
IL2
IL2
IL2 13
14
15 3
5
4W
B
G
LG
L A15 05-1 156
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DTC B1433/33 AIR OUTLET DAMPER POSITION SENSOR
CIRCUIT
CIRCUIT DESCRIPTION
This sensor detects the position of the mode damper servo
sub-assy and sends the appropriate signals to the A/C amplifi-
er assy. The position sensor is built into the mode damper servo
sub-assy .
DTC No.Detection ItemTrouble Area
B1433/33Short to ground or power source circuit in air outlet damper
position sensor circuit.
Mode damper position sensor (Air outlet damper position
sensor)
Harness or connector between mode damper servo sub-
assy and A/C amplifier assy
A/C amplifier assy
WIRING DIAGRAM
05ITZ-02
Page 1289 of 2572
I30331SG-4 (-)
TPO (+)
A/C Amplifier Connector
Wire Harness View:
A11
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 157
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INSPECTION PROCEDURE
HINT:
In case of using the hand-held tester, start the inspection step 1 and in case of not using the hand-held
tester, start from step 2.
1 READ VALUE OF HAND-HELD TESTER
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the items below in the DATA LIST, and read the displays on the hand-held tester.
A C:
ItemMeasurement Item/Display
(Range)Normal ConditionDiagnostic Note
A/O DAMP POSAir outlet damper position
/min.:-14% max.:113.5%Changes depending on air outlet
power position-
A/O DAMP TARGAir outlet damper target position
/min.:-14% max.:113.5%Changes depending on air outlet
power position-
Result:
NGA
OK (Checking from the DTC)B
OK (Checking from the PROBLEM SYMPTOM TABLE)C
B REPLACE AIRCONDITIONER AMPLIFIER ASSY
C PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE (SEE
PAGE 05-1 129)
A
2 INSPECT AIRCONDITIONER AMPLIFIER ASSY(TPO, SG-4)
(a) Remove the A/C amplifier assy with connectors still con-
nected.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connectionConditionSpecified condition
A11-6 (TPO) -
A11-1 (SG-4)FACE3.5 to 4.5 V
A11-6 (TPO) -
A11-1 (SG-4)DEF0.5 to 1.5 V
HINT:
As the air outlet servomotor is moved from FACE side to DEF
side, the voltage decreases gradually without interruption.
OK REPLACE AIRCONDITIONER AMPLIFIER ASSY
NG
Page 1290 of 2572
I30157
Mode Damper Servo Sub-assy
Connector Wire Harness View:
A15
I30333
FACE
DEF
I30161
3.4 -6.2
0.8 - 1.6
FACE
DEFArm Position Resistance (kW)
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3 INSPECT MODE DAMPER SERVO SUB-ASSY
(a) Remove the mode damper servo sub-assy.
(b) Measure resistance between terminals 1 and 2 of mode
damper servo sub-assy connector.
Standard:
Tester connectionConditionSpecified condition
A15-1 - A15-2Always4.2 to 7.8 kW
(c) While operating mode damper servo sub-assy as in the
procedure on page 05-1 164, measure resistance be-
tween terminals 1 and 3 of mode damper servo sub-assy.
Standard:
Tester connectionConditionSpecified condition
A15-1 - A15-3DEF3.4 to 6.2 kW
A15-1 - A15-3FACE0.8 to 1.6 kW
HINT:
As the mode damper servo sub-assy moves from DEF side to
FACE side, the resistance decreases gradually without inter-
ruption.
NG REPLACE MODE DAMPER SERVO SUB-ASSY
OK