Jacobsen AR3, Technical/Repair Manual

Page: 110 / 342

ELECTRICAL
4181384 First Edition 4-53
4
Start Circuit
Symptom: Starter motor solenoid does not engage.
Symptom: Fuel shutoff solenoid pull-in coil does not energize.
Probable Cause Remedy
Park brake switch in the released position. Place the park brake switch in the locked position.
Neutral switch is in the pedal engaged
position. Move drive pedals to the neutral position.
Seat switch is in the off position. Operator must be in the seat.
Mow switch is in the mow position. Place the mow switch in the off position.
Open 15A fuse F6. Test fuse. (See “Fuse Test” on page 4-61.)
Faulty seat switch. Test switch. (See “Seat Switch Test” on page 4-65.)
Faulty park brake switch. Test switch. (See “Park Brake Switch Test” on page 4-67.)
Faulty neutral switch. Test switch. (See “Traction Pedal Neutral Switch Test” on page 4-65.)
Faulty key switch. Test switch. (See “Key Switch Test” on page 4-63.)
Faulty Start relay. Test relay. (See “Relay Tests” on page 4-62.)
Faulty 5V power supply circuit. With the key switch in the run position, measure voltage between control module 5V
power supply terminal and ground. Voltage must be approximately 5 VDC.
Faulty 5V park brake switch input circuit. With the key switch in the run position, measure voltage between control module 5V park
brake input terminal and ground. Voltage must be approximately 5 VDC.
Faulty 5V seat switch input circuit. With the key switch in the run position, measure voltage between control module 5V seat
input terminal and ground. Voltage must be approximately 5 VDC.
Faulty 12V start relay output circuit. With the key switch in the run position, measure voltage between control module 12V
start relay output terminal and ground.
With the key switch in the run position, measure voltage between start relay terminal 1
and ground.
Voltage must be approximately 12 VDC.
Faulty start relay ground circuit. Measure continuity between start relay terminal 2 and ground. Continuity must be
indicated.
Faulty key switch start circuit. With the key switch in the start position, measure voltage between start relay terminal 5
and ground. Voltage must be approximately 12 VDC.
Faulty start relay output circuit. With the key switch in the start position, measure voltage between the starter motor
solenoid terminal and ground. Voltage must be approximately 12 VDC.
Probable Cause Remedy
Faulty pull-in coil. Test fuel shutoff solenoid. (See “Fuel Shutoff Solenoid Test” on page 4-69.)
Faulty pull-in coil circuit. With the key switch in the start position, measure voltage at fuel shutoff solenoid wht/blu
wire terminal. Voltage must be approximately 12 VDC.