B
FAULT TESTING
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
121
Repair and Service Manual
10002660
Temperature Sensor - Testing
NOTICE: If the temperature sensor is faulty, the
entire motor assembly must be replaced (See “Front
Motor Removal” on page 70) (See “Rear Motor
Removal” on page 72).
1.
If possible, allow the vehicle to cool to room tem-
perature.
2.
Unplug the temperature sensor harness at the motor
3.
Use the DVOM set on OHMS (
Ω
) and test the resis-
tance between the two pins on the motor side.
Fig. 17 Temperature Sensor
4.
A reading showing at or below the minimum value
indicates a bad sensor.
5.
A reading showing at or above the thermal cutoff
temperature indicates either a faulty sensor or a
severely overheating motor (Ref. Fig. 18) (Ref. Fig.
Fig. 18 KTY Temperature Sensor (male pins on the
connector)
Fig. 19 PT1000 Temperature Sensor (female pins on
the connector)
Electronic Speed Sensor - Testing
1.
Use the DVOM probes to check the motor speed
sensor while the connector is plugged in. With the
key on and the direction selector in gear; put the pos-
itive meter probe in the red wire connection. Put the
negative meter probe in the black wire connection.
5V should be indicated. If not, check the wiring and
the signal from the controller. Replace the speed
sensor if these are good.
2.
Put the negative meter probe in the black wire con-
nection. Put the positive meter probe in the green
wire connection. A 0 – 5V flash signal should be indi-
cated when the motor armature is rotated slowly. If
not, check the sensor magnet in the motor, then
replace the speed sensor.
Minimum Value
≈
359
Ω
(-40° C)
Room Temperature
≈
603
Ω
(25° C)
Beginning of Thermal
Cutback
≈
1297
Ω
(145° C)
Thermal Cutoff
Temperature
≈
1407
Ω
(160° C)
TEMPERATURE
SENSOR
Minimum Value
≈
843
Ω
(-40° C)
Room Temperature
≈
962
Ω
(25° C)
Beginning of Thermal
Cutback
≈
1555
Ω
(145° C)
Thermal Cutoff
Temperature
≈
1610
Ω
(160° C)
Speed Sensor
