5-4
NOTE: If the meter shows battery voltage, the
main wiring harness is good; proceed to test the
switch/component, the connector, and the switch
wiring harness for resistance.
RESISTANCE (Switch Connector)
NOTE: The brake lever must be compressed for
this test. Also, the ignition switch must be in the
OFF position.
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 compressed, the meter must
show less than 1 ohm.
NOTE: If the meter shows more than 1 ohm of
resistance, replace the switch.
Engine Coolant
Temperature (ECT)
Sensor
NOTE: The ECT sensor is located on the ther-
mostat housing in front of the engine.
1. Connect the meter leads (selector in OHMS posi-
tion) to the sensor terminals.
2. Suspend the sensor and a thermometer in a con-
tainer 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 approxi-
mately 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
The connector is the black two-prong one located
behind the fan assembly.
VOLTAGE (Main Harness
Connector to Fan Motor)
1. Set the meter selector to the DC Voltage position.
2. Connect the red tester lead to the black/red wire;
then connect the black tester lead to ground.
3. Disconnect the ECT sensor and start the engine.
4. The meter must show battery voltage.
NOTE: If the meter shows no battery voltage,
troubleshoot the battery, fuse, fan relay, ECU, or
the main wiring harness.
NOTE: If the meter shows battery voltage, the
main wiring harness is good. The connector
should be checked for resistance.
RESISTANCE
(Fan Motor Connector)
1. Set the meter selector to the OHMS position.
2. Connect the red tester lead to the blue wire; then
connect the black tester lead to the black wire.
! CAUTION
Always disconnect the battery when performing
resistance tests to avoid damaging the multimeter.
! WARNING
Wear insulated gloves and safety glasses. Heated oil
can cause severe burns.
! CAUTION
Always disconnect the battery when performing
resistance tests to avoid damaging the multimeter.
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