ELECTRICAL
4181383 First Edition 4-53
4
Symptom: Hydraulic filter pressure light does not turn on with a blocked filter.
Symptom: Hydraulic filter pressure light is on with the key switch in the run
position (engine off).
Symptom: Hydraulic filter pressure light is on with the key switch in the run
position (engine on).
Symptom: Engine temperature gauge indicates a temperature when the engine is cold.
Probable Cause Remedy
Faulty Control module output circuit. With the key switch in the run position, check control module hydr fltr lamp output LED. If
the LED turns on for approximately 3 seconds, check continuity between hydraulic
filter pressure light pur/grn wire terminal and control module hydraulic filter pressure
light output terminal J2-8.
If the LED does not turn on, substitute the control module with a known good control
module.
Faulty hydraulic filter pressure light
switched power circuit.
With the key switch in the run position (engine off), measure voltage between hydraulic
filter pressure light org/wht terminal and ground. Voltage must be approximately 12
VDC.
Faulty control module input circuit. Connect a jumper wire hydraulic filter pressure switch blu/yel wire terminal and ground.
With the key switch in the run position, check control module hydr fltr sw input LED. If
the LED does not turn on, check continuity between hydraulic filter pressure switch
bul/yel wire terminal and control module hydraulic filter pressure switch input terminal
J2-2. Continuity must be indicated.
If the wiring checks good, substitute the control module with a known good control
module.
Faulty hydraulic filter pressure switch. Replace hydraulic filter switch.
Probable Cause Remedy
Faulty hydraulic filter pressure switch. Replace hydraulic filter switch.
Probable Cause Remedy
Blocked hydraulic filter. Replace hydraulic filter.
Faulty hydraulic filter pressure switch. Replace hydraulic filter pressure switch.
Probable Cause Remedy
Faulty engine temperature sensor. Replace engine temperature sensor.
Faulty ground circuit. Check continuity between the engine temperature gauge and ground.
Continuity must be indicated.
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