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16-5
COOLING - COOLING FAN SYSTEM

COOLING FAN SYSTEM
160M7-02

ON-VEHICLE INSPECTION
1. INSPECT COOLING FAN OPERATION WHEN COOLANT TEMPERATURE IS 95_C (203_F) BE-
LOW
(a) Check that the cooling fan does not operate when turning the ignition switch ON with A/C switch OFF.
(b) Check that the cooling fan operates when turning the ignition switch ON with disconnecting the engine
coolant temperature sensor connector.

2. INSPECT COOLING FAN OPERATION WHEN COOL-
Cooling Fan Operation
ANT TEMPERATURE IS 97_C (207_F) ABOVE
(a) Warm up the engine and turn the A/C switch OFF.
97 _C (207 _F) (b) Check that the cooling fan operates when coolant tem-
ON
perature is 97_C (207_F) above.
(c) Check that the cooling fan stops when coolant tempera-
OFF ture is 95_C (203_F) below.
95 _C (203 _F)
Z13471

Cooling Fan ECU Connector
3. INSPECT COOLING FAN ECU
(a) Check the cooling fan ECU power source.
(1) Disconnect the cooling fan ECU connector.
(2) Measure the voltage between the terminals +B and
GND.
Voltage: 9 to 14 V
If the voltage is not specified, check the fusible link, fuse, wire
harness and fan relay.
A50564 (3) Reconnect the connectors.

Cooling Fan Connector (b) Check the cooling fan operation.
(1) Disconnect the cooling fan connectors.
Fan Fan No.2
(2) Check thet the fan operates when applying battery
positive to terminal M+ and and battery negative to
terminal M-.
(3) Measure the amperage.
Fan operation amperage: 10.6 to 16.6 A
(4) Disconnect the cooling fan No.2 connector.
M- (-) M+ (+) S- (-) S+ (+)
A79212 (5) Check thet the fan operates when applying battery
positive to terminal S+ and and battery negative to
terminal S-.
(6) Measure the amperage.
Fan No. 2 operation amperage: 5.6 to 11.6 A
It is not as specified, replace the fan motor(s).
(7) Reconnect the cooling fan connectors.

2005 SIENNA REPAIR MANUAL (RM1163U)

Author : Date : 2505
16-6
COOLING - COOLING FAN SYSTEM

(c) Check the wire harness continuity (ECM - cooling fan ECU).
(1) Disconnect the ECM connector and cooling fan ECU connector SI.
(2) Check the wire harness continuity.
If it is not specified, repair or replace the wire harness.
HINT:
Wire harness condition is diagnosed by cooling fan operartion.
Cooling fan operation Wire harness condition
Not operate Short
Operate continuously Open
(d) Check the ECM power source.
(e) Check RFC signal generation.
NOTICE:
Perform this inspection when coolant temperature is 82_C (180_F) below.
(1) Connect SST to M+ wire.
SST 09082-00040, 09083-00350
(2) Connect an oscilloscope to terminals RFC and E1 of the ECM.
(3) Check the signal generation and measure fan amperage under the condition.
Condition RFC signal generation Fan amperage Fan operation
Engine stopped, IG switch ON - - Not operate
Engine idling, A/C OFF - - Not operate
Engine idling, A/C ON Indication 1 7 to 11 A Operate
Engine idling, Disconnect engine coolant
Indication 2 10 to 19 A Operate (High speed)
temperature sensor connector

Indication 1 Oscilloscope indication:
HINT:
S If RFC signal is not specified, replace the ECM.
5V
S When the fan amperage has a problem in spite that the
RFC signal has no problem, replace the cooling fan ECU.

2 ms
Indication 2

A35652
2 ms
A35921 A56763

2005 SIENNA REPAIR MANUAL (RM1163U)

Author : Date : 2506

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