JLG 601S ANSI Service Manual - Manual (Page 116)

SECTION 3 - CHASSIS & TURNTABLE
3-76 – JLG Lift – 3120746
535 TPS1 Higher Than TPS2 This fault will set if TPS1 is 20% (or more) higher than TPS2. At this
point the throttle is considered to be out of specification, or there is a
problem with the TPS signal circuit. During this active fault, the MIL
light will be on and the engine will shut down.
536 TPS1 Lower Than TPS2 This fault will set if TPS1 is 20% (or more) lower than TPS2. At this
point the throttle is considered to be out of specification, or there is a
problem with the TPS signal circuit. During this active fault, the MIL
light will be on and the engine will shut down.
537 Throttle Unable To Open This fault will set if the throttle command is 20% or more than the
actual throttle position. During this active fault the MIL light will be on
and the engine will shut down.
538 Throttle Unable To Close This fault will set if the throttle command is 20% less than the actual
throttle position. During this active fault the MIL light will be on and the
engine will shut down.
545 Governor Interlock Failure This fault will set if Gov. 1, 2, or 3 are enabled and the EPM does not
detect a ground from the brake switch input. During this active fault
the MIL light will be on and Power Derate (level 1) and the Low Rev
Limit will be enforced. When these are enforced the maximum throt-
tle position is 50% and the maximum engine speed is 1600 RPM. The
Low Rev Limit is enforced for the remainder of the key-on cycle. If the
active fault is no longer present, the MIL light will flash at 2 Hz for the
remainder of the key-on cycle. This is a reminder that the Low Rev
Limit is still enforced.
551 Max Govern Speed Override This fault will set anytime the engine RPM exceeds 4500 for 2 sec-
onds or more continuously. This speed overrides any higher max
governor speeds programmed by the user. This is to help prevent
engine or equipment damage.
552 Fuel Rev Limit This fault will set anytime engine RPM exceeds 4800 for 2 seconds or
more continuously. When these conditions are met, the EPM shuts
off the fuel injectors. This is to help prevent engine or equipment
damage.
NOTE: If any other DTCs are present, diagnose those first.
553 Spark Rev Limit This fault will set anytime the engine RPM exceeds 4900 for 2 sec-
onds or more continuously. When these conditions are met, the EPM
will shut off spark to the engine. This is to help prevent engine or
equipment damage.
NOTE: If any other DTCs are present, diagnose those first.
611 COP Failure Several different things can happen within the microprocessor that
will cause this fault. The EPM will reset itself in the event this fault is
set, and the MIL will be on until the code is cleared. This fault should
be erased after diagnosis by removing battery power. It will not self-
erase.
During this active fault, Power Derate (level 2) will be enforced. When
this is enforced, maximum throttle position will be 20%. This is
enforced until the fault is manually cleared.
Table 3-10. EPM Diagnostic Trouble Codes
Diagnostic
Trouble
Code
Description Cause for Setting DTC