Engine Relays With 5 Terminals (Gasoline Engine) - Toro Reelmaster 5410 Series Service Manual

Engine Relays with 5 Terminals (Gasoline Engine)

Testing the Engine Relays with 5 Terminals
Electrical System: Testing the Electrical Components
g228830
1. Engine power center
2. Start relay
The engine electrical system in machines with a Kubota gasoline engine includes
3 electrical relays that have 5 terminals. These relays are installed in the engine
power center located on the engine
The start relay is used to provide current to the engine starter solenoid. The start
relay is energized by the engine ECU.
The power relay is used to provide electrical power to several engine electrical
components when energized by the engine ECU.
The fuel pump relay is used to provide electrical power to the fuel pump when
energized by the engine ECU.
Note: An engine fault code may be displayed on the InfoCenter Display if the
power relay, fuel pump relay or circuit wiring is damaged.
1. Park machine on a level surface, lower cutting units, shut off the engine,
apply parking brake and remove key from key switch.
2. Raise and support hood to access engine relays. Remove engine power
center cover and locate relay(s) to be tested. Remove relay from the engine
power center for 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 value from the measured value
of the component you are testing.
Figure 260
3. Power relay
4. Fuel pump relay
(Figure 260).
Page 7–92 Reelmaster ® 5410/5510/5610 Series
15216SL Rev C