4-58 4181384 First Edition
ELECTRICAL
4
Symptom: Hydraulic filter light is on with the key switch in the run position (engine off).
Symptom: Hydraulic filter light is on with the key switch in the run position (engine on).
Symptom: Over temp light and alarm is on when the engine is cold.
Symptom: Over temp-light and alarm do not turn on when the engine is over heated.
Symptom: Multi-function gauge does not
power up.
Probable Cause Remedy
Faulty hydraulic filter switch. Replace hydraulic filter switch.
Probable Cause Remedy
Blocked hydraulic filter. Replace hydraulic filter.
Faulty hydraulic filter switch. Replace hydraulic filter switch.
Probable Cause Remedy
Faulty engine temperature switch. Check continuity between engine temperature switch terminal and ground.
If continuity exists, replace engine temperature switch.
Probable Cause Remedy
Faulty engine temperature switch. Replace engine temperature switch.
Faulty over-temp light input circuit. Check continuity between control module over-temp light input terminal and engine
temperature switch connector. Continuity must be indicated.
Faulty 12V over-temp light output circuit. Check continuity between control module 12V over-temp light output terminal and over
temp light vio/yel wire terminal.
Check continuity between control module 12V over-temp light output terminal and alarm
vio/yel wire terminal.
Continuity must be indicated.
Faulty control module. Substitute the control module with a known good control module.
Probable Cause Remedy
Open 5A fuse F8. Test fuse. (See “Fuse Test” on page 4-61.)
Faulty multi-function gauge switched
power circuit.
With the key switch in the run position, measure voltage between multi-function gauge
terminal 2 and ground. Voltage must be approximately 12 VDC.
Open multi-function gauge ground circuit. Check continuity between multi-function gauge terminal 4 and ground.
Continuity must be indicated.
Faulty multi-function gauge. Substitute the multi-function gauge with a known good multi-function gauge.
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