Nilfisk-Advance 56507009, Troubleshooting Manual

Page: 23 / 82

FORM NO. 56043129 - SR 1900 - 23
ENGINE SYSTEM
TROUBLESHOOTING GUIDE
Troubleshooting Guide
Symptom
GM 1.6L 4 cylinder engine will not crank
Part A: Electrical Control and Load Circuit
Note 1: To test the key switch must be in Start position and the foot-pedal in neutral.
Note 2: Before T.S. check the CB1 60 Amp circuit breaker & 12V ‘s @ key switch Bat terminal.
Note 3: Before T.S. check Battery voltage @ starter main load red wire.
GM 1.6L 4 cylinder
engine will not crank
No
With the key in the start
mode, check for 12V
(+)@ Wht wire located
on starter solenoid. If yes
repair or replace starter
motor.
Remove the starter
relay (location engine
fuse box) and test for
12V (+) @ the
Red/Tan terminal #87
to Grd w/key in the
start mode.
Test for 12V input
(Red wire) @ F6
15A fuse. If NO
repair or replace
the Red Bat.+ feed
wire from its
source.
No
•Test F6 fuse,
replace if
defective.
•Repair Red/Tan
wire to starter
relay terminal #87
With starter relay
removed test for 12V@
the relay terminals #85 &
#86 (wire colors
Blue/Pink & Pink/Black)
w/key in the start mode.
Replace the defective
starter relay
Test for 12V(+) @
Blue/Pink wire (#86) to
Bat Grd, w/key in the
start mode.
@ the starter relay do
you have 12V(-) from
Pink/Black wire #85 to
Bat(+) w/key in the
start mode.
@ the K4 relay do you
have 12V(+) @ the
Blue/Pink wire w/key in
the start mode.
Repair the
Pink/Black wire
circuit. If good
replace the engine
ECM
@ the K4 relay do you
have 12V @ coil relay
wires Gra/Wht & Pink.
Replace the defective K4
neutral relay
Test for 12V @ Pink
K4 coil wire to Battery
Grd w/key on.
Troubleshooting
continued on next
page (part B).
Yes
No
Yes
No
Note A: Any time the machines hydrostat mounted neutral position sensor is replaced or the
hydrostat linkage adjusted its neutral position must be re-programmed. Also any time the A2
control box is replaced it must be re-programmed. See the programming options section in this
manual for instructions.