Service Manual

Multi Pro 5800 Page 6 − 69 Electrical System
Engine Relays (Gasoline Engines Only)
The engine electrical system in Multi Pro 5800 ma-
chines with gasoline engines includes three (3) electri-
cal relays that have five (5) terminals. These relays are
located in the engine power center located on top of the
engine near the hydraulic pump adapter (Fig. 100).
The start relay is used to provide current to the engine
starter solenoid. The start relay is energized by the en-
gine ECU.
The power relay is used to provide electrical power to
engine ignition coils, injectors, and oxygen (O2) sen-
sors. The power relay is energized by the engine ECU.
The fuel pump relay is used to provide electrical power
to the fuel pump. The fuel pump relay is energized by the
engine ECU.
NOTE: An engine fault code may be displayed on the
InfoCenter Display if the start relay, power relay or fuel
pump relay or circuit wiring is faulty (see Engine Faults
in this chapter for additional information).
Relay Testing
1. Park machine on a level surface, stop engine, apply
parking brake and remove key from ignition switch.
2. Remove engine shroud (attached to back of seat
base) to access engine power center. Remove engine
power center cover and remove suspect relay for test-
ing.
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.
3. Using a multimeter (ohms setting), measure coil re-
sistance between terminals 85 and 86 (Fig. 101 or 102).
Resistance should be as listed in table below (Fig. 99).
Relay
Coil Resistance
Start 81 to 99 ohms
Power or Fuel Pump 111 to 135 ohms
Figure 99
1. Engine power center
2. Start relay
3. Power relay
4. Fuel pump relay
Figure 100
2
1
34
Figure 101
8787a85
86 30
START RELAY
Figure 102
87
87a 8586
30
POWER AND FUEL PUMP RELAY