JLG 740A, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3121160 – JLG Lift – 3-97
513
FPP1 Higher Than IVS Limit This fault will set if the IVS is at idle (open) and the FPP 1 voltage is
greater than 1.2 volts. During this fault, Power Derate (level 2) and the
Low Rev Limit are enforced. When these are enforced the maximum
throttle position is 20% and the maximum engine speed is 1600 RPM.
The Low Rev Limit and Power Derate are 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 Power Derate and Low Rev Limits are still enforced.
514
FPP1 Lower Than IVS Limit This fault will set if the IVS is off-idle (closed) and the FPP 1 voltage is
less than 0.6 volts. During this fault, Power Derate (level 2) and the
Low Rev Limit are enforced. When these are enforced the maximum
throttle position is 20% and the maximum engine speed is 1600 RPM.
These are 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 remain-
der of the key-on cycle. This is a reminder that the Power Derate and
Low Rev Limits are still enforced.
521
FPP2 High Voltage This fault will set if signal voltage is over 4.8 volts at any operating
condition while the key is on.If the voltage exceeds 4.8, then FPP2 is
considered out of specification. 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. 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.
522
FPP2 Low Voltage This fault will set if signal voltage is less than 0.2 volts at any operating
condition while the key is on. If the voltage is less than 0.2, then FPP2
is considered out of specification. 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.
531
TPS1 (Signal Voltage) High This fault will set if voltage is above 4.8 volts at any operating condi-
tion while the engine is cranking or running. The engine will not start
or run during this active fault.
532
TPS1 (Signal Voltage) Low This fault will set if voltage is less than 0.2 volts at any operating con-
dition while the engine is cranking or running. The engine will not
start or run during this active fault.
533
TPS2 (Signal Voltage) High This fault will set if voltage is above 4.8 volts at any operating condi-
tion while the engine is cranking or running. The engine will not start
or run during this active fault. Throttle Position Sensor #2
534
TPS2 (Signal Voltage) Low This fault will set if voltage is below 0.2 volts at any operating condi-
tion while the engine is cranking or running. The engine will not start
or run during this active fault.
Table 3-11. EPM Diagnostic Trouble Codes
Diagnostic
Trouble
Code
Description Cause for Setting DTC