Nilfisk-Advance 56507009, Troubleshooting Manual

Page: 30 / 82

30 - FORM NO. 56043129 - SR 1900
ENGINE SYSTEM
TROUBLESHOOTING GUIDE
Troubleshooting Guide
Symptom
Diesel engine will not run at high speed
Note: With the engine running at idle press the engine speed switch to activate the high speed
engine function.
Diesel engine will not
run at high speed
Test for 12V’s (+) at the
Apec 3000 governor
speed select (1) input
terminal (Gra/Blu) to
battery (-) Grd.
Press on & off the
engine speed switch,
check for continuity @
ribbon connector (*)
pins J3-1 & J3-2 on the
A2 control box
assembly.
Ribbon pin’s
test open.
Replace the
touch pad
switch panel.
No No
Check for
12V’s (+) @
the A2 control
box output pin
J1-17
(Gra/Blu) to
Bat (-). Grd.
Replace the
A2 control box
assembly.
Repair or replace the
defective Gra/Blu wire.
Yes
Yes
No
Yes
Test the governor
controller actuator
output voltage, wire
colors Wht & Wht/Blk.
@ idle approx. 4.35 V
@ High speed 5.10 V.
Is there a voltage
increase from idle to
HS with a load?
Substitute a good
known working
actuator if engine runs
properly @ both idle &
HS replace actuator.
Substitute a good
known working
governor if engine
runs properly @
both idle & HS
replace governor.
Yes
No
* Ribbon connector see Electrical System Figure 1 for detail pin call-outs.