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Brakelight Switch
The switch connector is the two-prong black connector
below the master cylinder.
NOTE: The ignition switch must be in the ON posi-
tion.
VOLTAGE (Wiring Harness
Connector)
1. Set the meter selector to the DC Voltage position.
2. Connect the red tester lead to the orange wire; then
connect the black tester lead to ground.
PR276A
3. The meter must show battery voltage.
NOTE: If the meter shows no battery voltage, trou-
bleshoot the battery, fuse, switch, or the main wiring
harness.
NOTE: If the meter shows battery voltage, the main
wiring harness is good; proceed to test the
switch/component, the connector, and the switch wir-
ing harness for resistance.
RESISTANCE (Switch Connector)
NOTE: The brake pedal must be depressed for this
test.
1. Set the meter selector to the OHMS position.
2. Connect the red tester lead to one black wire; then
connect the black tester lead to the other black wire.
AR621D
3. When the lever is depressed, the meter must show
less than 1 ohm.
NOTE: If the meter shows more than 1 ohm of resis-
tance, replace the switch.
Engine Coolant
Temperature (ECT)
Sensor
1. Connect the meter leads (selector in OHMS position)
to the sensor terminals.
2. Suspend the sensor and a thermometer in a container
of cooking oil; then heat the oil.
NOTE: Neither the sensor nor the thermometer
should be allowed to touch the bottom of the con-
tainer or inaccurate readings will occur. Use wire
holders to suspend the sensor and thermometer.
3. On the ECT sensor when the temperature reaches
40° C (104° F), the meter should read approximately
1136 ohms.
4. On the ECT sensor when the temperature reaches
100° C (212° F), the meter should read approxi-
mately 155 ohms.
5. If the readings are not as indicated, the sensor must
be replaced.
6. Install the sensor and tighten securely.
7. Connect the leads.
Fan Motor
RESISTANCE
(Fan Motor Connector)
1. Set the meter selector to the OHMS position.
CAUTION
Always disconnect the battery when performing resis-
tance tests to avoid damaging the multimeter.
! WARNING
Wear insulated gloves and safety glasses. Heated oil
can cause severe burns.