Inspection Of Radiator Cooling Fan Components

EZ Battery Reconditioning Method

How to Repair Batteries at Home

Get Instant Access

1. INSPECT A/C AMPLIFIER FOR CIRCUIT

Disconnect the A/C amplifier connector, and check the connector on the wiring harness side as shown in the chart on the next page.

Check for

Tester connection

Condition

Specified valve

Continuity

3 - Ground

-

Continuity

Voltage

4 - Ground

Ignition switch ON

Battery voltage

Resistance

9-15

Coolant temp.

85°C (185°F)

Approx. 1.35 kQ

90°C (194°F)

Approx. 1.19 kQ

95°C (203°F)

Approx. 1.05 kQ

Voltage

10 - Ground

Ignition switch ON

Battery voltage

Continuity

13 - Ground

-

Continuity

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

Check the relay in the same way as the Ignition Main Relay.

3. INSPECT NO.1 COOLING FAN RELAY ("FAN NO.1")

A. Inspect relay continuity

(a) Using an ohmmeter, check that there is continuity between terminals 1 and 2.

(b) Check that there is continuity between terminals 3 and 4.

If continuity is not as specified, replace the relay.

Toyota Mr2 Fan Switch

B. Inspect relay operation

(a) Apply battery voltage across terminal 1 and 2.

(b) Using an ohmmeter, check that there is no continuity between terminals 3 and 4.

If operation is not as specified, replace the relay.

Fotos Seguridad Montacargas

4. INSPECT NO.2 COOLING FAN RELAY ("FAN NO.2")

A. Inspect relay continuity

(a) Using an ohmmeter, check that there is continuity between terminals 1 and 2.

(b) Check that there is continuity between terminals 3 and 4.

(c) Check that there is no continuity between terminals 3 and 5.

If continuity is not as specified, replace the relay.

B. Inspect relay operation

(a) Apply battery voltage across terminal 1 and 2.

(b) Using an ohmmeter, check that there is no continuity between terminals 3 and 4.

(c) Check that there is continuity between terminals 3 and 5.

If operation is not as specified, replace the relay.

5. INSPECT NO.3 COOLING FAN RELAY ("FAN NO.3")

A. Inspect relay continuity

(a) Using an ohmmeter, check that there is continuity between terminals 1 and 2.

(b) Check that there is no continuity between terminals 3 and 5.

If continuity is not as specified, replace the relay.

B. Inspect relay operation

(a) Apply battery voltage across terminal 1 and 2.

(b) Using an ohmmeter, check that there is continuity between terminals 3 and 5.

If operation is not as specified, replace the relay.

6. INSPECT RADIATOR WATER TEMPERATURE SENSOR

Using an ohmmeter, measure the resistance between the terminals.

Resistance:

Approx. 1.35 kQ at 85°C (185°F) Approx. 1.19 kQ at 90°C (194°F) Approx. 1.05 kQ at 95°C (203°F)

If resistance is not as specified, replace the sensor.

7. INSPECT NO. 1 AND NO. 2 RADIATOR COOLING FANS

(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.

Was this article helpful?

0 0
DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

Get My Free Ebook


Responses

  • martha
    Where is the main relay for cooling fans on a 1991 mr2?
    2 years ago

Post a comment