Lexus NX manuals

Lexus NX: Cooling Fan Ecu

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (cooling) / Cooling Fan Ecu

On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT COOLING FAN ECU

(a) Check and ensure the following conditions:

(1) The power switch is off.

(2) The engine coolant temperature is less than 92°C (198°F).

(3) The auxiliary battery voltage is between 11 and 14 V.

(4) The A/C switch is off.

(b) Connect the pickup of a clamp-on ammeter around 1 of the 2 wires for the cooling fan motor.

(c) Turn the power switch on (IG) and wait for approximately 10 seconds. Check that the fan does not operate.

(d) Put the engine in inspection mode (maintenance mode).

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(e) Start the engine. Check that the fan does not operate with the engine idling.

HINT:

  • Make sure that the engine coolant temperature is less than 92°C (198°F).
  • Turn the A/C switch off.

(f) Check that the fan operates when the A/C switch is turned on.

Standard Current:

Item

Condition

Specified Condition

Cooling fan motor

Auxiliary battery voltage applied at 20°C (68°F)

4.0 to 20.0 A

No. 2 cooling fan motor

4.0 to 20.0 A

HINT:

Make sure that the engine coolant temperature is less than 92°C (198°F).

(g) Check that the fan operates when the engine coolant temperature sensor connector is disconnected.

Standard Current:

Item

Condition

Specified Condition

Cooling fan motor

Auxiliary battery voltage applied at 20°C (68°F)

4.0 to 20.0 A

No. 2 cooling fan motor

4.0 to 20.0 A

(h) After the engine is warmed up, check that the fan operates as shown in the illustration.

HINT:

  • The engine coolant temperature at which the fan starts operating is approximately 94°C (201°F).
  • This system can also be checked using the Techstream.
  • Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
Powertrain > Engine and ECT > Data List

Tester Display

Coolant Temp

*a

Operating Diagram

*b

A/C OFF

*c

MAX HI

*d

HI

*e

LO

*f

MAX LO

*g

Fan Speed

READ NEXT:

 Cooling Fan Motor

 Components

COMPONENTS ILLUSTRATION *1 COOLING FAN ECU *2 COOLING FAN MOTOR *3 COOLING FAN WIRE *4 FAN *5 NO. 2 COOLING FAN MOTOR *6 NO. 2 FAN *7 COOLING FAN MOTOR INSULATOR

 On-vehicle Inspection

ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT COOLING FAN MOTOR (a) Disconnect the cooling fan motor connector. (b) Check that the fan rotates smoothly by hand. (c) Check that the cooling fan motor tu

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 Precaution

PRECAUTION PRECAUTIONS WHEN USING TECHSTREAM (a) When using the Techstream with the vehicle power switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then sel

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