Nilfisk-Advance 56507009, Troubleshooting Manual

Page: 25 / 82

FORM NO. 56043129 - SR 1900 - 25
ENGINE SYSTEM
TROUBLESHOOTING GUIDE
Troubleshooting Guide
Symptom
GM 1.6L 4 cylinder engine will crank but not start
Part A:
Note 1: Check for 12V’s at the CB5 ignition circuit breaker 10A. If no input voltage @ the
Orn/Grn wire repair or replace wiring or key switch. Note 2: Check the fuel supply (empty
tank). Note 3: Check the condition of the spark plugs, replace if needed.
Engine will crank but not
start
Check the engine’s ECM for
any DTC (diagnostic test
codes) two methods.
• Check for any active codes
with a computer using the
GCP diagnostic software.
• Using a short piece of wire
jump the engines diagnostic
connector (pins #1 & #4).
See the engine section in
this manual for instructions.
Check the continuity of all the fuses
listed below, location engine fuse
box.
•F1 5A VSW
•F2 20A ECM
•F4 15A Ignition
•F5 15A fuel pump (gasoline only)
Replace defective fuses
Engine still will not start
No
See the 1.6L Tier 2 Engine Service
Manual (form # PSIP6LPFI-A) &
look-up the specific (DTC) and use
the T.S. chart for it to fix the
problem.
Ignition coil testing
Using a spark plug tester check for
spark @ each cylinder.
No spark all cylinders; W/key in the on position test (probe) for 12V @ the B+ pink/Grn wire @
the coil pack to Grd. If 0 V’s repair wire to its power source F4 fuse. Still no start ?
With the engine cranking test for 1.5V
(Aprox.) @ each B- coil pack wires Yel &
Yel/Red to B+.
Repair B- coil wire(s) to ECM. Still no
voltage signal substitute a good ECM.
Engine still will not start ?
1. Test resistance of both primary coil
pack windings. Specification is
108K Ohms (plus or minus 15%)
2. Test resistance of both secondary
coil pack windings. Specification is
5K Ohms (plus or minus 15%) Do
both test ok ?
Replace the ignition coil pack.
Troubleshooting continued on next page,
see additional system checks
T.S. continued next page, see
additional system checks
Yes
Yes
No
Yes
Yes
Yes