Start Relay - Toro Reelmaster 5010- H Service Manual

Start Relay

The start relay is used in the engine starting circuit.
When energized by the TEC controller, the start relay
provides a current path to energize the engine starter
solenoid. The start relay has five (5) terminals and is at-
tached to a frame bracket under the hood near the en-
gine exhaust muffler (Fig. 53). Relays can be identified
by a tag on the wire harness.
Testing
NOTE: The start relay should be tested as a TEC con-
troller output with the InfoCenter Display before discon-
necting and testing the relay (see Diagnostics Screen
(Engine Start item) in the InfoCenter Display section of
this chapter). The InfoCenter Display will identify if the
TEC output to the start relay exists when machine con-
trols are in the correct position. If the TEC controller out-
put exists for the start relay but the relay is not
functioning correctly, suspect a failed start relay or an
open in the start relay circuit.
1. Park the machine on a level surface, engage the
parking brake, lower the cutting units and stop the en-
gine. Remove the key from the ignition switch.
2. Open hood to gain access to start relay. Remove
hood saddle from machine for easier access to start
relay.
3. Locate start relay and disconnect the machine wire
harness connector from the relay. Remove relay from
machine for easier testing.
NOTE: Prior to taking small resistance readings with a
digital multimeter, short the meter test leads together.
The meter will display a small resistance value (usually
0.5 ohms or less). This resistance is due to the internal
resistance of the meter and test leads. Subtract this val-
ue from the measured value of the component you are
testing.
4. Using a multimeter (ohms setting), measure coil re-
sistance between terminals 85 and 86 (Fig. 54). Resist-
ance should be between 70 and 90 ohms.
5. Connect multimeter (ohms setting) leads to relay ter-
minals 30 and 87. Ground terminal 86 and apply +12
VDC to terminal 85. The relay should have continuity be-
tween terminals 30 and 87 as +12 VDC is applied to ter-
minal 85. The relay should not have continuity between
terminals 30 and 87 as +12 VDC is removed from termi-
nal 85.
Electrical System
6. Disconnect voltage from terminal 85 and multimeter
lead from terminal 87.
7. Connect multimeter (ohms setting) leads to relay ter-
minals 30 and 87A. Apply +12 VDC to terminal 85. The
relay should not have continuity between terminals 30
and 87A as +12 VDC is applied to terminal 85. The relay
should have continuity between terminals 30 and 87A
as +12 VDC is removed from terminal 85.
8. When testing is complete, disconnect voltage and
multimeter leads from the relay terminals.
9. Replace start relay if testing determines that it is
faulty.
10.Secure start relay to machine and connect machine
wire harness connector to relay. Install hood saddle to
machine. Lower and secure hood.
1. Exhaust muffler
2. Start relay
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1
Figure 53
3. Hood saddle
86 87A
85 30
Figure 54
Reelmaster 5010- H
3
87