Genie Z-45/25 Service Manual page 112

Section 5 • Troubleshooting Flow Charts
TROUBLESHOOTING FLOW CHARTS
About This Section
When a malfunction is discovered, the flow charts
in this section will help a service professional
pinpoint the cause of the problem. To use this
section, basic hand tools and certain pieces of test
equipment are required—voltmeter, ohmmeter,
pressure gauges.
The location of terminals mentioned in this section
can be found on the appropriate electrical or
hydraulic schematics provided in Section 6,
Schematics .
Since various degrees of a particular function
loss may occur, selecting the appropriate flow
chart may be troublesome. When a function will not
operate with the same speed or power as a
machine in good working condition, refer to the
flow chart which most closely describes the
problem.
5 - 2
General Repair Process
Malfunction
discovered
Return to
service
Fault codes
The ECM constantly monitors the engine by the
use of sensors on the engine. The ECM also
uses signals from the sensors to initiate
sequential fuel injection and make constant and
instantaneous changes to ignition timing, fuel
delivery and throttle position to maintain the
engine's running condition at its highest
efficiency while at the same time keeping
exhaust emissions to a minimum. When a
sensor fails or returns signals that are outside of
set parameters, the ECM will store a fault code
in memory that relates to the appropriate sensor
and will turn on the Check Engine Light. See
Repair Section, How to Retrieve Engine Fault
Codes. Use the Fault Code Chart on the
following pages to aid in identifying the fault.
Genie Z-45/25 & Genie Z-45/25J
First Edition • Second Printing
Identify
symptoms
problem
still exists
Inspect
and test
problem
solved
Troubleshoot
Perform
repair
Part No. 52709