Digital Input Checks - Komatsu 830E Shop Manual

2.2 Digital Input Checks

1. The two digit diagnostic display panel should have a 00 event code to indicate that all previous
event codes have been cleared. If not, press reset switch to clear codes.
2. For the digital inputs listed below, do the PROCEDURE TO ACTIVATE as specified, and verify
that the display status of the digital input name on the MANUAL DIGITAL OUTPUT TEST
SCREEN changes from false (regular display) to = true (inverse display), unless otherwise
noted. Restore any switch settings and wiring changes to their original condition before moving
on to check the next digital input.
3. All digital inputs have now been checked, except contactor feedback inputs, which will be
checked with digital outputs in next section.
DI NAME DESCRIPTION
FIRSTSRCH FIRST SEARCH SW
LASTSRCH LAST SEARCH SW
2DDRESET LOCAL RESET SW
ACCELSWITCH
AS
(Non-Fuel Saver Only)
RETARD SWITCH
RS
(Non-Fuel Saver Only)
DUMP OVERRIDE
DOS
SWITCH
RETARD SPEED CON-
RSC
TROL SWITCH
DBUP DUMP BODY UP SWITCH
2 SPEED OVERSPEED
2SOS SYSTEM
(LOAD WEIGHT SWITCH)
IDLE SWITCH
IDLESW
(Non-Fuel Saver only)
ACCINH ACCEL INHIBIT SIGNAL
FAILED DIODE PANEL
FAILDIODE
SIGNAL
E03012 2/02
PROCEDURE TO
ACTIVATE
Press Up Arrow Switch on
Two Digit Display.
Press Down Arrow Switch on
Two Digit Display.
Press Reset Switch on Two
Digit Display.
Accelerator pedal applied.
Pedal released
Press retard pedal.
Pedal released
Press override switch.
Pull retard speed control
switch to On position.
Remove wire 71F.
Restore circuit 71F.
Disconnect wire 73LS routed
to the rear suspension pres-
sure switches and insulate.
Jumper from 71 to 73LS.
Remove 71 to 73LS jumper
(Reconnect 73LS.)
Move idle switch from low
(turtle) position to high idle
position.
Place switch in low position.
No signal (0v input)
Jumper 73S to 710 to ener-
gize park brake failure relay
coil. (Leave jumper con-
nected to simulate Park
Brake Not Applied)
Remove wire 73A from FDP
term D.
Replace wire 73A.
Statex III Electrical Checkout Procedure
FUNCTION
= true (inverse display) = switch depressed
= true (inverse display) = switch depressed
= true (inverse display) = switch depressed
= true (inverse display) = ACCEL request =28v input
false (regular display) = no ACCEL request =0v input
= true (inverse display) = retard request = 0v input
false (regular display) = no request = 28v input
= true (inverse display) = switch depressed
= true (inverse display) = switch depressed
= true (inverse display) = body up = 0v input
Verify Body-Up light in cab illuminates.
false (regular display) = body down = 28v input
= true (inverse display) = loaded truck = 0v input
false (regular display) = empty truck = 28v input
= true (inverse display) = high idle = 0v input
false (regular display) = low idle = 28v input
= true (inverse display) = inhibit = 0v input
false (regular display) = not inhibit = 28v input
= true (inverse display) = failed diode = 0v input
Verify that electrical system fault light on instrument
panel comes On with wire 73A removed.
false (regular display) = ok diode = 28v input
E3-19