Jacobsen Eclipse 322, Руководство по ремонту

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4-122 4222983 Second Edition
ELECTRICAL
4
Horn Circuit
Horn does not turn on.
Work Light Circuit
Work light does not turn on.
Work light does not turn off.
Glow Plug Circuit
Glow plugs do not get hot.
Probable Cause Remedy
Faulty horn switch. Test horn switch using LCD display “Switch Test”. (See “Switch Test” on page 4-85.)
If the horn switch does not activate during the LCD “Switch Test”, bench test the switch.
(See “Rocker Switches Test” on page 4-130.)
Faulty wiring. Check wiring between horn and LCD display.
Faulty horn. Substitute the horn with a known good horn. If system now works, re-install old
component to verify fault returns.
Faulty LCD. Substitute the LCD with a known good LCD. If system now works, re-install old
component to verify fault returns.
Probable Cause Remedy
Faulty work light switch. Test work light switch using LCD display “Switch Test”. (See “Switch Test” on page 4-85.)
If the work light switch does not activate during the LCD “Switch Test”, bench test the
switch. (See “Rocker Switches Test” on page 4-130.)
Brake diode (V6) is shorted. Test diode and replace if needed.
Faulty work light output circuit. With the key switch in the run position, place the work light switch in the on position and
check the main control unit (MCU) headlight output LED.
If the LED turns on, work light output circuit is good; replace work light.
If the LED does not turn on, MCU work light output circuit is faulty; substitute the MCU
with a known good MCU.
Probable Cause Remedy
Faulty work light switch. Test work light switch using LCD display “Switch Test”. (See “Switch Test” on page 4-85.)
If the work light switch does not activate during the LCD “Switch Test”, bench test the
switch. (See “Rocker Switches Test” on page 4-130.)
Faulty work light output circuit. Disconnect MCU connector J3 and place the work light switch in the off position. With the
key switch in the run position, check the work light.
If the work light is on, work light wire 64 Brn/Wht is shorted to ground; check wire.
If the work light is off, MCU work light output is internally shorted; substitute the MCU
with a known good MCU.
Probable Cause Remedy
Faulty glow plug relay output. Turn the key switch to the run position; check the main control unit (MCU) glow plug relay
output LED (on for 1-6 seconds). If the LED does not come on, substitute the MCU
with a known good MCU.
Faulty wiring. Check wiring between the glow plug terminal strip and PDU.
Faulty glow plug relay in PDU. Substitute the PDU with a known good PDU. If system now works, re-install old
component to verify fault returns.