Speed Sensor - Toro 500 EFI Service Manual


NOTE: For this test, the meter must be in OHMS
position.
4. On the sensor side of connector, connect the black (nega-
tive) test lead to one white wire pin; then connect the red
(positive) test lead to the other white wire pin. Readings
should be between 6.7 and 10.1 ohms.

NOTE: If the meter does not read as specified,
replace the sensor.
MANIFOLD ABSOLUTE PRESSURE/
INLET AIR TEMPERATURE (MAP/IAT)
SENSOR
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 section).

NOTE: The ambient temperature of the engine and
in the intake and exhaust system must be at room
temperature (approximately 68° F) when performing
this test or an incorrect reading will occur.
1. Disconnect the MAP/IAT connector from the sensor
located on top of the throttle body.
2. Select DC Voltage on the tester and turn the ignition
switch to the ON position.
3. Connect the black tester lead to the black/pink wire and
the red tester lead to the orange/blue wire. The meter
should read 4.5-5.5 DC volts. If the meter does not read
as specified, check the ECM connector or wiring.
4. Connect the MAP/IAT to the harness; then using needle
adapters, connect the red tester lead to the brown/white
wire and the black tester lead to the black/pink wire.
With the engine running at idle speed, the meter should
read approximately 2.5 DC volts (MAP sensor signal).
5. Connect the red tester lead to the green/red wire.
With the engine at idle and at room temperature
(approximately 60° F), the meter should read
approximately 2.9 DC volts.
130

NOTE: If the meter does not read as specified,
replace the sensor.

Speed Sensor


NOTE: Prior to testing the speed sensor, inspect the
three-wire connector on the speed sensor for con-
tamination, broken pins, and/or corrosion.
1. Set the meter selector to the DC Voltage position.
2. With appropriate needle adapters on the meter leads,
HDX 247
connect the red tester lead to the voltage lead (V); then
connect the black tester lead to the ground lead (G).
700
3. Turn the ignition switch to the ON position.
4. The meter must show greater than 5 volts (500) or
approximately 6 volts (700).
5. Leave the black tester lead connected; then connect the
red tester lead to the signal lead pin (S).
6. Slowly move the vehicle forward or backward; the meter
must show 0 and approximately 6 volts alternately.
To replace a speed sensor, use the following procedure.
1. Disconnect the three-wire connector from the speed sen-
sor; then remove the cap screw securing the sensor to the
sensor housing.
2. Remove the sensor from the sensor housing accounting
for an O-ring.
500
KC248A
PR279A