cooling TOYOTA SIENNA 2007 Service Repair Manual

CO–42GR-FE COOLING – COOLING FAN SYSTEM
CO
SYSTEM DIAGRAM
A162785E01

2GR-FE COOLING – COOLING FAN SYSTEMCO–5
CO
ON-VEHICLE INSPECTION
1. INSPECT COOLING FAN SYSTEM
(a) Put the vehicle in the following conditions:
(1) The engine switch is off.
(2) The coolant temperature is less than 95
C
(203
F).
(3) The battery voltage is between 9 and 14 V.
(4) The A/C switch is OFF.
(b) Clamp the 400 A probe of an ammeter over the M+
wire of each cooling fan motor.
(c) Turn the ignition switch to the ON position and wait
for approximately 10 seconds. Check that the fan
stops.
(d) Start the engine. Check that the fan stops with the
engine idling.
HINT:
• Make sure that the radiator engine coolant
temperature is less than 95
C (203F).
• Turn the A/C switch OFF.
(e) Check that the fan operates when the A/C switch is
turned ON (MAX COOL and the magnetic clutch is
operating).
Standard current
HINT:
The coolant temperature is less than 95
C (203F).
(f) Check that the fan operates when the engine
coolant temperature sensor connector is
disconnected.
Standard current
Item Specified Condition
No. 1 cooling fan motor 5 to 14 A
No. 2 cooling fan motor 4 to 12 A
Item Specified Condition
No. 1 cooling fan motor 5 to 19 A
No. 2 cooling fan motor 4 to 16 A

CO–62GR-FE COOLING – COOLING FAN SYSTEM
CO
(g) After the engine is warmed up, check that the fan
operates as shown in the illustration.
HINT:
• The coolant temperature at which the fan starts
operating is approximately 95
C (203F).
• This system can also be checked using the
intelligent tester.
• Select the following menu items: Powertrain /
Engine / Data List / Initial Engine Coolant Temp.
A139339E05

PP–14PREPARATION – 2GR-FE COOLING
PP
EQUIPMENT
Ohmmeter -
Radiator cap tester -
Thermometer -
To r q u e w r e n c h -
Slide calipers -
Heater -
Ammeter (A) -

PREPARATION – 2GR-FE COOLINGPP–15
PP
COOLANT
Capacity Classification
11.3 liters (12.0 US qts, 10.0 Imp. qts) Use only "TOYOTA Super Long Life Coolant" or similar high quality
ethylene glycol based non-silicate, non-amine, non-nitrite, non-borate
coolant with long-life hybrid organic acid technology (coolant with
long-life hybrid organic acid technology consists of a combination of
low phosphates and organic acids).

PP–16PREPARATION – 2GR-FE COOLING
PP
SSM
Toyota Genuine Seal Packing Black, Three Bond 1207B or Equivalent -

AIR CONDITIONING – CONDENSERAC–237
AC
REMOVAL
1. RECOVER REFRIGERANT FROM REFRIGERATION
SYSTEM (See page AC-172)
2. REMOVE NO. 2 AIR CLEANER INLET (See page EM-
28)
3. REMOVE FRONT BUMPER ASSEMBLY (See page
ET-3)
4. DISCONNECT DISCHARGE HOSE SUB-ASSEMBLY
(a) Remove the bolt and disconnect the discharge hose
sub-assembly from the cooler condenser core.
(b) Remove the O-ring from the discharge hose sub-
assembly.
NOTICE:
Seal the openings of the disconnected parts
using vinyl tape to prevent entry of moisture and
foreign matter.
5. DISCONNECT COOLER REFRIGERANT LIQUID PIPE
A
(a) Remove the bolt and disconnect the cooler
refrigerant liquid pipe A from the cooler condenser
core.
(b) Remove the O-ring from the cooler refrigerant liquid
pipe A.
NOTICE:
Seal the openings of the disconnected parts
using vinyl tape to prevent entry of moisture and
foreign matter.
6. REMOVE NO. 1 AIR CLEANER INLET (See page EM-
28)
7. REMOVE HOOD LOCK RELEASE LEVER
PROTECTOR (See page CO-29)
8. REMOVE HOOD LOCK ASSEMBLY (See page CO-29)
9. REMOVE HOOD LOCK SUPPORT SUB-ASSEMBLY
(See page CO-29)
10. DISCONNECT COOLING FAN ECU CONNECTOR
(See page CO-30)
11. REMOVE UPPER RADIATOR SUPPORT SUB-
ASSEMBLY (See page CO-30)
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AC–240AIR CONDITIONING – CONDENSER
AC
4. CONNECT NO. 2 OIL COOLER OUTLET TUBE SUB-
ASSEMBLY
(a) Install the No. 2 oil cooler outlet tube sub-assembly
with the 2 bolts.
Torque: 6.0 N*m (61 kgf*cm, 53 in.*lbf)
5. INSTALL UPPER RADIATOR SUPPORT SUB-
ASSEMBLY (See page CO-42)
6. CONNECT COOLING FAN ECU (See page CO-42)
7. INSTALL HOOD LOCK SUPPORT SUB-ASSEMBLY
(See page CO-43)
8. INSTALL HOOD LOCK ASSEMBLY (See page CO-43)
9. INSTALL HOOD LOCK RELEASE LEVER
PROTECTOR (See page CO-44)
10. INSTALL NO. 1 AIR CLEANER INLET (See page EM-
59)
11. INSTALL COOLER REFRIGERANT LIQUID PIPE A
(a) Remove the attached vinyl tape from the pipe and
the connecting part of the cooler condenser core.
(b) Sufficiently apply compressor oil to a new O-ring
and the fitting surface of the pipe joint.
Compressor oil:
ND-OIL 8 or equivalent
(c) Install the O-ring on the cooler refrigerant liquid pipe
A.
(d) Install the cooler refrigerant liquid pipe A on the
cooler condenser core with the bolt.
Torque: 5.4 N*m (55 kgf*cm, 47 in.*lbf)
12. INSTALL DISCHARGE HOSE SUB-ASSEMBLY
(a) Remove the attached vinyl tape from the tube and
the connecting part of the cooler condenser core.
(b) Sufficiently apply compressor oil to a new O-ring
and the fitting surface of the hose joint.
Compressor oil:
ND-OIL 8 or equivalent
(c) Install the O-ring on the discharge hose sub-
assembly.
(d) Install the discharge hose sub-assembly on the
cooler condenser core with the bolt.
Torque: 5.4 N*m (55 kgf*cm, 47 in.*lbf)
13. INSTALL FRONT BUMPER ASSEMBLY (See page ET-
9)
14. INSTALL NO. 2 AIR CLEANER INLET (See page EM-
60)
15. CHARGE WITH REFRIGERANT (See page AC-173)
16. WARM UP ENGINE
17. INSPECT FOR REFRIGERANT LEAK (See page AC-
173)
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2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–1
ES
SFI SYSTEM
PRECAUTION
1. INITIALIZATION
NOTICE:
• Perform RESET MEMORY (AT initialization) when
replacing the automatic transaxle assembly, engine
assembly or ECM (See page AX-16).
• Perform REGISTRATION (VIN registration) when
replacing the ECM (See page ES-15).
HINT:
Initialization cannot be completed by only removing the
battery.
2. FOR USING INTELLIGENT TESTER
CAUTION:
Observe the following items for safety reasons:
• Before using the tester, read the instruction
manual.
• Prevent the tester cable from being caught on the
pedals, shift lever and steering wheel when
driving with the tester connected to the vehicle.
• When driving the vehicle for testing purposes
using the tester, two persons are required. One is
for driving the vehicle, and the other operates the
tester.
3. FOR USING BATTERY DURING INSPECTION
(a) While using the battery during inspection, do not
bring the positive and negative tester probes too
close to each other as a short circuit may occur.
4. COOLING FAN SYSTEM
NOTICE:
• When the ignition switch is turned off and the engine
temperature is high, the cooling fans may operate for
approximately 3 minutes.
• After turning the ignition switch off, keep hands and
objects away from the fans when they are operating.
HINT:
If all of the following are met for a certain period of time during
a few minute period immediately before the engine is
stopped, the electric fans will continue to operate for 3
minutes after the engine is stopped. This is performed to
ensure restartability and stabilize idle speed.
– The intelligent tester indicates a very high coolant
temperature.
– The intelligent tester indicates a high outside air
temperature.
– The vehicle has been driven under high load (driving on an
uphill or equivalent).
The following sensors are used for this control:
– Coolant temperature sensor
– Outside air temperature sensor
–MAF sensor
– Vehicle speed sensors

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–31
ES
PROBLEM SYMPTOMS TABLE
HINT:
When a malfunction is not confirmed by a DTC (Diagnostic
Trouble Code) check and the cause of problem cannot be
identified through a basic inspection, troubleshoot according
to the priority order indicated in the table below.
SFI SYSTEM
Symptom Suspected Area See page
Engine does not crank (does not start)1. Immobilizer systemEI-2
2. StarterST-7
3. STARTER RelayST-14
4. Cranking holding function circuitES-461
No initial combustion (does not start)1. ECM power source circuitES-437
2. Ignition systemIG-5
3. Fuel pump control circuitES-451
4. InjectorFU-16
5. VC output circuitES-444
6. ECMES-498
Difficult to start (engine cranks normally)1. Electronic Throttle Control System (ETCS)ES-329
2. Fuel pump control circuitES-451
3. Ignition systemIG-5
4. Spark plugIG-7
5. CompressionEM-3
6. InjectorFU-16
7. VC output circuitES-444
Difficult to start with cold engine1. Cranking holding function circuitES-461
2. Electronic Throttle Control System (ETCS)ES-329
3. Fuel pump control circuitES-451
4. Spark plugIG-7
5. Ignition systemIG-6
6. InjectorFU-16
7. Engine coolant temperature sensorES-516
Difficult to start with hot engine1. Cooling fan systemCO-4
2. Cranking holding function circuitES-461
3. Electronic Throttle Control System (ETCS)ES-329
4. Fuel pump control circuitES-451
5. Spark plugIG-7
6. Ignition systemIG-5
7. InjectorFU-16
8. Engine coolant temperature sensorES-516
High engine idle speed (poor idling)1. Electronic Throttle Control System (ETCS)ES-329
2. ECM power source circuitES-437
3. A/C signal circuit (Compressor circuit) -
4. Acoustic Control Induction System (ACIS)ES-470
5. PCV hoseEC-15
6. ECMES-498