JLG 740AJ, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3121160 3-147
512 FPP1 Low Voltage This fault will set if 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 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 throttle 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.
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 maxi-
mum 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 maxi-
mum 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 remainder 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 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.
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 throttle 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 condition 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 condition 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 condition 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 condition while the engine is cranking or
running. The engine will not start or run during this active fault.
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.
Table 3-13. EPM Diagnostic Trouble Codes
Diagnostic
Trouble
Code
Description Cause for Setting DTC