Toro Reelmaster 5010-H Diagnostic Manual page 30

3. Wait 10 minutes to allow the engine to cool and measure the resistance across the pins of the temperature
sender again. As the engine cools, the resistance across the pins of the temperature sender should
increase.
Note:
The following table shows sample data across a wide range of temperatures. Notice that as coolant
temperature decreases from 240 °F to 200 °F, the change in resistance across the pins of the temperature
sender is less than half an ohm.
Temperature
68 °F (20 °C)
86 °F (30 °C)
104 °F (40 °C)
140 °F (60 °C)
200 °F (95 °C)
220 °F (105 °C)
240 °F (115 °C)
Pass
As the engine cooled, the resistance through the temperature sender increased. Go to Step 4.
Fail As the engine cooled, the resistance through the temperature sender did not increase. Replace
the temperature sender according to the procedure outlined in the Component Testing section in
Chapter 5 of the 5010-H Service Manual. Go to
follow the steps listed.
Step 4: Test the temperature sender wiring.
1. Remove the access panel from the outer cover of the control arm
Figure 14
Temperature Sender Resistance
Returning the Machine to Service (page 22)
(Figure
30
11.4 to 13.6 ohms
7.4 to 8.75 ohms
4.9 to 5.75 ohms
2.3 to 2.6 ohms
0.74 to 0.83 ohms
0.56 to 0.63 ohms
0.42 to 0.47 ohms
15).
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