2001 TOYOTA SEQUOIA air conditioning

SS0O3±04
± SERVICE SPECIFICATIONSAIR CONDITIONING
SS±51
193 Author: Date:
2005 SEQUOIA (RM1146U)
AIR CONDITIONING
SERVICE DATA
Refrigerant charge volume Single A/C750 ± 50 g (26.45 ± 1.76 oz.)
Dual A/C1,050 ± 50 g (37.03 ± 1.76 oz.)
Idle speed Magnetic clutch not engaged700 ± 50 rpm
Magnetic clutch engaged780 ± 50 rpm
Magnetic clutch clearance0.5 ± 0.15 mm (0.020 ± 0.0059 in.)

SS0O4±05
SS±52
± SERVICE SPECIFICATIONSAIR CONDITIONING
194 Author: Date:
2005 SEQUOIA (RM1146U)
TORQUE SPECIFICATION
Part tightenedN´mkgf´cmft´lbf
REFRIGERANT LINE
Receiver x Liquid tube5.45548 in.´lbf
Condenser x Discharge hose5.45548 in.´lbf
Condenser x Liquid tube5.45548 in.´lbf
Compressor x Discharge hose101007
Compressor x Suction hose101007
Liquid and suction tube (Nut)5.45548 in.´lbf
Liquid and suction tube x Rear A/C unit5.45548 in.´lbf
COOLING UNIT
Evaporator x Expansion valve x Liquid and suction tube3.53631 in.´lbf
REAR A/C UNIT
Tube and accessory x Evaporator5.45531 in.´lbf
Tube and accessory x Expansion valve2223516
Expansion valve x Liquid tube1313510
COMPRESSOR AND MAGNETIC CLUTCH
Compressor x Engine (Bolt)4748035
Compressor x Bracket x Engine (Nut)2525518
Pressure plate x Rotor x Compressor1818412.3
PRESSURE SWITCH
Pressure switch x Liquid tube101007
WATER TEMPERATURE SWITCH
Water temperature switch x Radiator7.47565 in.´lbf

DI±1644
± DIAGNOSTICSCOMBINATION METER SYSTEM
1838 Author: Date:
2005 SEQUOIA (RM1146U)
Malfunction in engine coolant temperature receiver gauge
CIRCUIT DESCRIPTION
The ECM receives an engine coolant temperature signal from the engine coolant temperature sensor and
sends it to the A/C ECU.
The combination meter receives the signal from the A/C ECU through multiplex communication. Therefore,
if a malfunction occurs in the engine coolant temperature receiver gauge, there may be a malfunction in the
multiplex communication system, air conditioning system, or engine system.
(Multiplex communication system: See page DI±1892)
(Air conditioning system: See page DI±2301)
(Engine system: See page DI±9)
INSPECTION PROCEDURE
1 Perform active test by hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand±held tester main switch ON.
CHECK:
From the display on the tester, perform the ºACTIVE TESTº.
METER:
ItemTest DetailsDiagnostic Note
COOLANT TEMPHIGH / NORMAL / LOW (OFF)Confirm that the vehicle is stopped and engine is
idling.
OK:
Engine coolant temperature receiver gauge readings change according to hand±held tester op-
eration.
OK Go to engine system or air conditioning system
(See page DI±9 or DI±2301).
NG
Replace combination meter
(See page IN±35).
DID92±01

DI3IO±11
Customer Problem Analysis
Vehicle Brought to Workshop
Problem Symptom ConfirmationSymptom Simulation Problem does not
occur
Check DTC
Normal code
Problem Symptoms Table
Identification of Problem
Repair
Confirmation Test
EndTitles inside
are titles of pages in this
manual, with the page number indicated in
the bottom portion. See the indicated pages
for detailed explanations.
1
23
4
6
8P. IN±24
*1P. DI±1893
P. DI±1904Malfunction code
Problem
occurs
Circuit Inspection
P. DI±1908 ± DI±1952
See page
Body control system
Driver door control system
Passenger door control systemSystem
DI±1682
DI±1780
DI±1816
DI±1610
Step 4, 8: Diagnostic steps permitting the use of the hand±held tester.*15
7
Combination meter system
Slide roof control system
DI±1662 DI±1852 Back door control system
Power seat control system
w/ Driving position memoryDI±1505
Supplemental restraint system
Air conditioning systemDI±1126
DI±2301 DI±1892
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2086 Author: Date:
2005 SEQUOIA (RM1146U)
HOW TO PROCEED WITH TROUBLESHOOTING
Perform troubleshooting in accordance with the procedure on the following page.

DI±1942
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2136 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check air conditioning system.
CHECK:
Check the operation of the air conditioning system.
OK:
The air conditioning system operates normally.
NG Go to air conditioning system
(See page DI±2301).
OK
2 Check wire harness (Integration control and panel ± combination meter, integra-
tion control and panel ± body ECU).
PREPARATION:
Disconnect connector ºB5º of the body ECU connector, ºI19º of the integration control and panel and connec-
tor ºC5º of the combination meter.
CHECK:
Measure the resistance according to the values in the table below.
OK:
Tester connection (Symbols)ConditionSpecified condition
C5±32 ± I19±13 (MPX±)AlwaysBelow 1 W
B5±24 (MPX2) ± I19±3 (MPX+)AlwaysBelow 1 W
C5±32 ± Body groundAlways10 kW or higher
B5±24 (MPX2) ± Body groundAlways10 kW or higher
NG Repair or replace wire harness.
OK
Replace integration control and panel.
If the problem recurs even after replacement, replace the body ECU.

AC2810
DIDKM±01
AC2811
N11084
Wrong Okay
HI LO HILO
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2297
2491 Author: Date:
2005 SEQUOIA (RM1146U)
AIR CONDITIONING SYSTEM
PRECAUTION
1. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED
AREA OR NEAR AN OPEN FLAME
2. ALWAYS WEAR EYE PROTECTION
3. BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN
YOUR EYES OR ON YOUR SKIN
If liquid refrigerant gets in your eyes or on your skin:
(a) wash the area with lots of cool water.
CAUTION:
Do not rub your eyes or skin.
(b) apply clean petroleum jelly to the skin.
(c) go immediately to a hospital or see a physician for profes-
sional treatment.
4. NEVER HEAT CONTAINER OR EXPOSE IT TO NAKED
FLAME
5. BE CAREFUL NOT TO DROP CONTAINER OR APPLY
PHYSICAL SHOCKS TO IT
6. DO NOT OPERATE COMPRESSOR WITHOUT
ENOUGH REFRIGERANT IN REFRIGERATION SYS-
TEM
If there is not enough refrigerant in the refrigerant system, oil lu-
brication will be insufficient and compressor burnout may occur.
Necessary care should be taken to avoid this.
7. DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE
WHILE COMPRESSOR IS OPERATE
Open and close only the low pressure valve. If the high pressure
valves are opened, refrigerant flows in the reverse direction
causing the charging cylinder to rupture.
8. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH
REFRIGERANT
If refrigerant is overcharged, it causes problems such as insuffi-
cient cooling, poor fuel economy, engine overheating etc.

DI±2298
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2492 Author: Date:
2005 SEQUOIA (RM1146U)
9. SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
The SEQUOIA is equipped with an SRS (Supplemental Re-
straint System) such as the driver, passenger, side, curtain
shield airbag. Failure to carry out service operation in the cor-
rect sequence could cause the SRS to unexpectedly deploy
during servicing, possibly leading to a serious accident. Before
servicing (including removal or installation of parts, inspection
or replacement), be sure to read the precautionary notices tn
the RS section.
10. INITIALIZATION
NOTICE:
When disconnecting the battery terminal, initialize the fol-
lowing system after the terminal is reconnected.
System NameSee Page
Back Door Power Window Control Sys-
temBE±77

DIDKN±01
I28851
R/B No. 2

Heater Main Relay
(Marking: HTR)
Compressor
Condenser
Receiver Pressure Switch
Integration Panel Assembly

A/C ECU

A/C Switch

Air Inlet Selector
Heater Unit

Heater Radiator

Air Mix Servomotor

Air Outlet Servomotor
Cooling Unit

Blower Motor Linear
Controller

Evaporator

Expansion Valve

ThermistorBlower Unit

Blower Motor

Air Inlet Servomotor
Water Valve
Rear Heater
Control Assembly
Condenser Fan
Ambient
Temperature
Sensor
Solar Sensor
Room
Temperature
Sensor
Rear Room Temperature
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2299
2493 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION