Lincoln Electric RED-D-ARC DX450 Service Manual page 77

F-33
ENGINE CONTROL UNIT TEST (continued)
TABLE F.1 - ENGINE CONTROL UNIT VOLTAGES (Continued on Next Page)
Function Pin Numbers
Hour Meter
1GV (Chassis)
Oil Pressure
Switch 1GV (Chassis)
Water
Temperature 1GV (Chassis)
Switch
Engine Alt.
Detect 1GV (Chassis)
Low Idle Signal
1GV (Chassis)
Run/Stop Detect
1GV (Chassis)
ECU Power
1GV (Chassis)
Start Button
Sense 1GV (Chassis)
Starter Relay
Drive 1GV (Chassis)
Actuator 34GV to 18GV
Chassis
Ground
TROUBLESHOOTING AND REPAIR
Expected
Readings
6GV to 0 VDC
O Ohms.
27GV to
This N.C. switch
should open when
the engine is running.
28GV to Greater than
500K Ohms
26GV to 12 VDC
0 VDC
31GV to
Note: 12 VDC
during high speed
16GV to 12 VDC
15GV to 12 VDC
12GV to 12 VDC
7GV to 0 VDC
12 VDC
Note: Actuator
Resistance 2-4
19GV to 0 Ohms
Conditions
Switch in Run
Position
Switch in Stop
Note:
Position
Switch in Stop
Position
Switch in Run
Position
Switch in Run
Position. Idle
Switch in Auto
Position
Switch in Run
Position and Start
Button Activated
Switch in Run
Position and Start
Button Activated
Start Button
Activated
Switch in Run
Position and Start
Button Activated
Switch in Run
Position
Ohms
N/A
DX450
F-33
Comments
Engine Running
Engine Not
Running.
Engine Not
Running
Engine Running
Engine Running
at Low speed
Engine Cranking
Engine Cranking
N/A
Pulls low to
energize starter
relay
Engine Running
N/A