Toyota Corolla Cross: Cooling Fan Ecu

On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. CHECK COOLING FAN SYSTEM

(a) Check and ensure the following conditions:

(1) The ignition switch is off.

(2) The engine coolant temperature is less than 86 °C (187 °F).

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

(4) The A/C switch is off.

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

(c) Turn the ignition switch to ON and wait for approximately 10 seconds. Check that the cooling fan is not operating.

(d) Start the engine. Check that the cooling fan is not operating with the engine idling.

HINT:

• Make sure that the engine coolant temperature is less than 86 °C (187 °F).
• Turn the A/C switch off.

(e) Check that the cooling fan operate when the A/C switch is turned on.

(f) Measure the current while the cooling fan motor is turning.

Standard Current:

HINT:

The engine coolant temperature should be less than 86 °C (187 °F).

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

(h) Measure the current while the cooling fan motor is turning.

Standard Current:

(i) After the engine is warmed up, check that the cooling fan operate as shown in the illustration. HINT: The engine coolant temperature at which the fans start operating is approximately 88 °C (190 °F). This system can also be checked using the GTS. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature Powertrain > Engine > Data List Tester Display Coolant Temperature

*a Operating Diagram *b Fan Speed *c MAX HI *d HI *e LO *f OFF

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