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2-5
Engine Air TEMPERATURE
6) Verify test clips make good contact and do not touch each
other.
Make sure red and green test clips are not touching anything.
7) Set RANGE switch to HIGH.
8) Set FUNCTION switch to OHMS.
9) Note TEST light position on tester.
If the sensor is good, the light will move downwards as the
sensor heats up.
10) On-Car test only: Disconnect test leads and reconnect
sensor to vehicle wiring harness.
11) Heat sensor tip thoroughly.
On-Car test: Start engine and idle at 2000 RPM until upper
radiator hose is hot.
Off-Car test:
– Dip sensor tip into boiling water, OR...
– (metal sensor housing) Heat tip with flame from candle or
cigarette lighter OR...
– (plastic sensor housing) Heat tip with hair dryer.
12) On-Car test only: Turn ignition key OFF. Disconnect
vehicle wiring harness from sensor and reconnect test
leads as before.
13) Observe TEST light position for test results.
• Good Sensor - TEST light moved downwards below original
position. (TEST light may go off if sensor is very hot - this is
OK.) The TEST light will move upwards as the sensor cools
off. Range of TEST light movement varies with sensor type
and temperature change.
• Bad Sensor - TEST light position did not change during test.
14) Testing is complete.
Set RANGE switch to POWER OFF and remove all test
leads.
RANGE
HIGH
LOW
POWER OFF
FUNCTION
VOLTS
OHMS
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