Brakelight Switch; Engine Coolant Temperature (Ect) Sensor - Toro 500 EFI Service Manual

Brakelight Switch

Component data can be retrieved using the CATT II. Uti-
lize the Sensor Data screen.
The switch connector is the two-prong black connector
below the master cylinder.

NOTE: The ignition switch must be in the ON position.
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 battery ground.
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 wiring har-
ness for resistance.
RESISTANCE (Switch Connector)
CAUTION
Always disconnect the battery when performing resis-
tance tests to avoid damaging the multimeter.

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.
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)
Component data can be retrieved using the CATT II. Uti-
lize the Sensor Data screen.

NOTE: Preliminary checks may be performed on
this component using the diagnostic mode on the
LCD gauge (see EFI Diagnostic System in this sec-
PR276A
tion).
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.
Wear insulated gloves and safety glasses. Heated oil
can cause severe burns.
3. If the readings are not as indicated, the sensor must
be replaced.
MODEL
500
700
Sensor
! WARNING
OIL TEMPERATURE
20 °C (68 °F) 2.45k
50 °C (122 °F) 800
80 °C (176 °F) 318
110 °C (212 °F) 142
40 °C (104 °F) 1136
100 °C (212 °F) 155
AR621D
OHMS
127