2001 TOYOTA SEQUOIA clutch

± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2309
2503 Author: Date:
2005 SEQUOIA (RM1146U)Symbols (Terminals No.)
Wiring ColorTerminal DescriptionConditionSpecified Condition
TS e S5±TSLGBSl i lIG ON08t 43VTS e S5 TS
(I20±14 e I20±21)LG e BSolar sensor signalIG ON0.8 to 4.3 V
AIR e GNDGWOAir inlet control servomo-IG ON, Push FRS switchBelow 1.0 VAIR e GND
(I20±20 e I19±10)G±W e OAir inlet control servomo
tor operation signalIG ON, Push REC switch10 to 14 V
AIF e GNDROAir inlet control servomo-IG ON, Push FRS switch10 to 14 VAIF e GND
(I20±8 e I19±10)R e OAir inlet control servomo
tor operation signalIG ON, Push REC switchBelow 1.0 V
TPI e SG±TPIWYRAir inlet control servomo-IG ON, Push REC switch3.5 to 4.5 VTPI e SG TPI
(I20±16 e I20±13)W e Y±RAir inlet control servomo
tor control signalIG ON, Push FRS switch0.5 to 1.5 V
RTRSG R TRRttIG ON, Rr room temp.: 25°C (77°F)1.8 to 2.2 VRrTR e SG±RrTR
(I22±13 e I22±14)*1GR±R e R±YRear room temperature
sensor signalIG ON, Rr room temp.: 40°C
(104°F)1.2 to 1.6 V
FACE eGND
(I20±5 e I19±10)GR e OAir outlet control servo-
motor control signalMode control switch: except FACE
" FACE10 to 14 " Below 1.0 V
B/L eGND
(I20±6 e I19±10)BR±W e OAir outlet control servo-
motor control signalMode control switch: except BI±
LEVEL " BI±LEVEL10 to 14 " Below 1.0 V
IGN e GNDYGOEi lti i lE i idliPl tiIGN e GND
(I22±3 e I19±10)Y±G e OEngine revolution signalEngine idlingPulse generation
TW e GNDWROEngine coolant tempera-IG ONPl tiTW e GND
(I22±2 e I19±10)W±R e OEngine coolant tem era
ture sensor signalIG ONPulse generation
ACT eGND
(I22±5 e I19±10)LG±B e OCompressor operation
signalIG ON, A/C switch: OFF " ONBelow 1.0 "10 to 14 V
TE e SG±TEGBWGEvaporator temperature
IG ON, Evaporator temp.: 0°C
(32°F)2.0 to 2.4 VTE e SG TE
(I20±4 e I20±2)G±B e W±GEva orator tem erature
sensor signalIG ON, Evaporator temp.: 15°C
(59°F)1.4 to 1.8 V
MGC eGND
(I19±5 e I19±10)L e OMagnetic clutch control
signalEngine start
A/C switch: OFF " ON10 to 14 " Below 1.0 V
LOCK eGND
(I19±9 e I19±10)W±R e OCompressor lock sensor
signalEngine start
A/C switch: OFF " ONPulse generation
*1: w/ Rear A/C

± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2315
2509 Author: Date:
2005 SEQUOIA (RM1146U)BLOWER LEVEL
Blower motor speed level /
min.: Level 0 max.: 31Increases within a range between
0 and 31 as the speed increases.±
AMBI TEMP
Adjusted ambient temperature /
min.: ±30.8°C (±23.44°F)
max.: 50.8°C (123.44°F)
±±
SET TEMP SHIFTShift set temperature / +2C, +1C,
NORMAL, ±1C, ±2CCustomized value will be dis-
played±
AIR INLET MODEAir inlet mode / AUTO, MANUALCustomized value will be dis-
played±
COMPRESSOR MODECompressor mode / AUTO,
MANUALCustomized value will be dis-
played±
COMPRS/DEF OPERCompressor / DEF operation
mode / LINK, NORMALCustomized value will be dis-
played±
FOOT/DEF MODEFoot / DEF auto mode / ON, OFFCustomized value will be dis-
played±
DESTINATION
Destination / DOMEST, USA, EU-
ROPE, AUSTRAL, MIDEAST, NO
INFO
Changes with destination±
REAR ROOM TEMP
Room temperature sensor (Rear) /
min.: ±6.5°C (20.3°F)
max.: 57.25°C (135.05°F)Actual room temperature is dis-
played
Open in the circuit:
±6.5°C (20.3°F)
Short in the circuit:
57.25°C (135.05°F)
R±EVAP TEMP
Evaporator temperature sensor /
min.: ±29.7°C (±21.46°F)
max.: 59.55°C (139.19°F)Actual evaporator temperature is
displayed
Open in the circuit:
±29.7°C (±21.46°F)
Short in the circuit:
59.55°C (139.19°F)
SET TEMP REARSet temperature (Rear side) /
min.: 0 max.: 255Set temperature and displayed
temperature are the same.±
ESTIMATE TEMP±R
Estimated temperature (Rear side)
/ min.: ±200°C (±328°F)
max.: 200°C (392°F)Damper is at ºMAX. COOLº:
±200°C (±328°F)
Damper is at ºMAX. HOTº:
200°C (392°F)
±
A/M DAMP POS±RAir mix damper position (Rear
side) / min.: ±14% max.: 113.5%
Damper is at ºMAX. COOLº:
±10.0%
Damper is at ºMAX. HOTº
100.0%
±
A/M DAMP TARG±R
Air mix damper target position
(Rear side) /
min.: ±14% max.: 113.5%Damper is at ºMAX. COOLº:
±10.0%
Damper is at ºMAX. HOTº
100.0%
±
BLOWER LEVEL±RBlower motor speed level /
min.: Level 0 max.: 31Increases within a range between
0 and 31 as the speed increases.±
#CODESNumber of trouble codes /
min.: 0 max.: 255Number of DTCs will be displayed±
ENGINE AND ECT / ALL:
ItemMeasurement Item / Display
(Range)Normal ConditionDiagnostic Note
A/C SIGA/C signal / ON or OFFA/C ON: ON±
A/C MAG CLUTCHA/C magnet clutch / ON or OFFA/C magnet clutch ON: ON±

DI±2316
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2510 Author: Date:
2005 SEQUOIA (RM1146U)
2. ACTIVE TEST
HINT:
Performing the ACTIVE TEST using the hand±held tester allows the relay, VSV, actuator and so on to oper-
ate without part removal. Performing the ACTIVE TEST as the first step of troubleshooting is one way to
shorten labor time.
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) From the display on the tester, perform the ºACTIVE TESTº.
AIR CONDITIONING:
ItemTest Details / Display (Range)Diagnostic Note
BLOWER MOTORBlower motor / min.: 0 max.: 31±
AIR MIX DAMP±DAir mix damper (Driver side) / min.: ±14% max.: 113.5%±
A/I DAMP±LINEARAir inlet damper position (Linear) / min.: ±14% max.: 113.5%±
REAR BLOWERBlower motor (Rear) / min.: 0 max.: 31±
AIR MIX DAMP±RAir mix damper (Rear) / min.: ±14% max.: 113.5%±
A/C MAG CLUTCHA/C magnetic clutch relay / OFF, ON±
DEFOGGER RLY±RDefogger relay (Rear) / OFF, ON±

I28835
24
Y±B W±R
A3
A/C Magnetic Clutch
and Lock Sensor 2
1IG4
SG±TAM Integration Control
and Panel
13
I19LOCK
20
I19 Y±B W±R
J14
J/C
AA 23
Y±B
IG4
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2339
2533 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 22 Compressor Lock Sensor Circuit
CIRCUIT DESCRIPTION
This sensor sends 1 pulse per engine revolution to the integration control and panel.
If the compressor speed divided by the engine speed is smaller than a predetermined value, the integration
control and panel turns the compressor OFF. The indicator flashes at about 1 second intervals.
DTC No.Detection ItemTrouble Area
22
All conditions below are detected for 3 sec. or more
(a) Engine speed: 450 rpm or more
(b) Ratio of engine to compressor speed deviates 20% or more
in comparison to normal operation.

Compressor drive belt

Compressor lock sensor

Compressor

Harness or connector between compressor lock sensor and
integration control and panel

Integration control and panel
WIRING DIAGRAM
DIDKY±01

I05252
21
N02774
0.2 V/Din.
LOCK IN signal waveform
0 V
20 msec/Division (Idling)
DI±2340
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2534 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check compressor.
PREPARATION:
(a) Check and adjust compressor drive belt tension (See page AC±15).
CHECK:
(a) Check that the compressor does not lock when starting the engine and turning the A/C switch on.
OK: Cooler compressor assy does not lock during operation
HINT:
If the compressor drive belt slips when the A/C switch is on, the magnet clutch seems to be locked.
If the condition continues for more than 3 seconds, the A/C amplifier turns off the magnet clutch for compres-
sor drive belt protection.
NG Replace compressor.
OK
2 Check compressor lock sensor.
PREPARATION:
Disconnect the compressor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the com-
pressor lock sensor connector.
OK:
Resistance : 65 to 125 W at 20°C (68 °F)
Reference: Inspection using oscilloscope
During cranking or idling, measure the voltage between termi-
nals LOCK and SG±TAM of the integration control and panel.
HINT:
The correct waveform appears as shown in the illustration on
the left.
NG Replace compressor.
OK

I29011
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 DI±2342
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2536 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 23 Pressure Switch Circuit
CIRCUIT DESCRIPTION
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
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 pressure switch and integra-
tion control and panel

Refrigerant pipe line

Integration control and panel
DI3FD±09

I29010
Pressure switch:
A4
DI±2344
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2538 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check 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 the air conditioning
cycle may have decreased significantly for reasons such as a gas leakage.
NG Check air conditioning cycle
(See page AC±3).
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 is 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

I28845
ECM
E5
E5G±BIntegration Control
and Panel
I22
ACT
AC1
8 25
24
L±W 2
21
5 MG CLT Relay
J3 J/C
15
IG4 C
C Engine Room J/B
2
2C4
2G
3
A3
A/C Magnetic Clutch
and Lock Sensor R±Y
IA1 LG±B5
4
Engine Room R/B No. 2
2 22 G±Y
MGC 5
I19 I22 ACT
AC1
IA5
R±Y1
L±W L±W
R±Y
L
L
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2381
2575 Author: Date:
2005 SEQUOIA (RM1146U)
Compressor Circuit
CIRCUIT DESCRIPTION
The integration control and panel outputs the magnetic clutch ON signal from terminal AC1 to the ECM.
When the ECM receives this signal, it sends a signal from terminal ACT and switches the A/C magnetic clutch
relay ON. This turns the A/C magnetic clutch on.
WIRING DIAGRAM
DIAA8±03