JLG 740AJ Service Manual - Manual (Page 148)

SECTION 3 - CHASSIS & TURNTABLE
3-96 – JLG Lift – 3121160
321 Injector Driver #4 Open (2.5L) This fault will set if the EPM detects 10 injector firings with the internal
driver sense voltage greater than 4 volts while the injector is in the on-
state and battery voltage is less than 16 volts.
322 Injector Driver #4 Shorted (2.5L) This fault will set if the EPM detects 10 injector firings with the internal
driver sense voltage greater than 4 volts while the injector is in the on-
state and battery voltage is less than 16 volts.
351 Fuel Pump Loop Open or High Side Short To Ground This fault will set if the EPM detects Fuel Pump high-side on-state
voltage less than 4 volts while battery voltage is greater than 8 volts.
When this fault occurs, the MIL light will illuminate and the engine will
shut down.
352 Fuel Pump High Side Shorted To Power This fault will set if the EPM detects Fuel Pump high-side voltage
greater than 4 volts while the pump should be off and the battery volt-
age is less than 16 volts. When this fault occurs, the MIL light will illu-
minate and the engine will shut down.
411 Coil Driver #1 Open (2.5L) This fault will set if the EPM detects 10 coil firings which require the
adaptive dwell to be greater than allowed with the battery voltage
above 11 volts.The purpose of this fault is to detect an open or high
impedance circuit to the coil, or an open primary coil.
412 Coil Driver #1 Shorted (2.5L) This fault will set if the EPM detects 10 coil firings in which the adap-
tive dwell is less allowed and battery voltage is less than 16 volts.The
purpose of this fault is to detect a short to ground in the harness, or
internally to the primary coil.
413 Coil Driver #2 Open (2.5L) This fault will set if the EPM detects 10 coil firings which require the
adaptive dwell to be greater than allowed with the battery voltage
above 11 volts. The purpose of this fault is to detect an open or high
impedance circuit to the coil, or an open primary coil.
414 Coil Driver #2 Shorted (2.5L) This fault will set if the EPM detects 10 coil firings in which the adap-
tive dwell is less than allowed and battery voltage is less than 16 volts.
The purpose of this fault is to detect a short to ground in the harness,
or internally to the primary coil.
511 FPP1 High Voltage This fault will set if voltage is over 4.8 volts at any operating condition
while the key is on. If the voltage exceeds 4.8, then FPP1 is consid-
ered to be out of specifications. At this point the EPM does not have a
valid signal, and must therefore enforce the low rev limit and Power
Derate (level 1). When these are enforced the maximum throttle posi-
tion is 50% and the maximum engine speed is 1600 RPM. The Low
Rev Limit is enforced for the remainder of the key-on cycle. Rev limit
is still enforced 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.
512 FPP1 Low Voltage This fault will set if voltage is less than 0.2 volts at any operating con-
dition while the key is on. If the voltage is less than 0.2, then FPP1 is
considered to be out of specifications. At this point the EPM does not
have a valid signal, and must therefore enforce the low rev limit and
Power Derate (level-1). 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.
Table 3-11. EPM Diagnostic Trouble Codes
Diagnostic
Trouble
Code
Description Cause for Setting DTC