312C, 315C, 318C, 319C, 320C, 321C, 322C, 325C, 330C and M325C Excavators and 325C MHPU and 330C MHPU Mobile Hydraulic Power Units Engine and Pump Control – V2 – Check of Controller LED Indicator – Troubleshoot



Illustration 1 g00691925

Controller At The Rear Of The Cab

(1) Green LED

(2) Yellow LED

(3) Red LED

(4) Controller

Table 1
Normal Indications Of The LED    
Key Start Switch     Green LED     Yellow LED     Red LED     Remarks    
ON     ON     OFF     OFF     The red LED will momentarily illuminate when the key start switch is turned from the OFF position to the ON position.    
OFF     OFF     OFF     OFF     The green LED will remain illuminated for approximately 10 seconds after the key start switch is turned to the OFF position.    
Table 2
Indications Of The LED For A Malfunction    
LED Display     Description and Action    
No LED is illuminated.     Power is not supplied to the controller. Perform Testing And Adjusting, “No Power Supply to Controller – Troubleshoot”.    
The yellow LED is illuminated.     Communications between the controller and the monitor have malfunctioned. Perform Testing And Adjusting, “No Power Supply to Controller – Troubleshoot”.    
The red LED is flashing or illuminated.     The controller has malfunctioned. Replace the controller. See Testing And Adjusting, “Controller – Replace”.