Inspection Of Engine Compartment Cooling Fan Components

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1. INSPECT COOLING FAN ECU FOR CIRCUIT

Disconnect the cooling fan ECU connector, and check the connector on the wiring harness side as shown in the chart.

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Check for

Tester connection

Condition

Specified valve

Continuity

1 - Ground

-

Continuity

Voltage

2 - Ground

Ignition switch ON

Battery voltage

Voltage

3 - Ground

Ignition switch ON

Battery voltage

Resistance

5-6

Coolant temp.

20°C (68°F)

Approx. 2.45 kQ

57.5°C (135.5°F)

Approx. 0.63 kQ

80°C (176°F)

Approx. 0.32 kQ

Voltage

7 - Ground

Ignition switch ON

Battery voltage

Continuity

9 - Ground

Ignition switch ON

Battery voltage

2. INSPECT IGNITION MAIN RELAY ("IGN") (See page CH-18)

3. INSPECT COOLING FAN MAIN RELAY ("VENT") (See page CO-23)

Check the relay the same way as for the No.1 Cooling Fan Relay.

Ohmmeter

C01134

4. INSPECT ENGINE COMPARTMENT TEMPERATURE SENSOR

Using an ohmmeter, measure the resistance between the terminals.

Resistance:

Approx. 2.45 kQ at 20°C (68°F) Approx. 0.63 kQ at 57.5°C (135.5°F) Approx. 0.32 kQ at 80°C (176°F)

If resistance is not as specified, replace the sensor.

C01134

Mr2 Engine Bay Fan Sensor

5. INSPECT ENGINE COMPARTMENT COOLING FAN

(a) Connect battery and ammeter to the cooling fan connector.

(b) Check that the cooling fan rotates smoothly, and check the reading on the ammeter.

Standard amperage: 3.1 - 4.3 A

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  • reginard
    How to test coolinh fan ecu 1991 mr2 turbo?
    3 years ago

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