JLG 740AJ Service Manual User Manual
Page 147
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SECTION 3 - CHASSIS & TURNTABLE
3121160
– JLG Lift –
3-95
232
MAP Low Voltage
This fault will set when the MAP reading is lower than the sensor
should normally produce. When this fault is set the Adaptive learn will
be disabled for the remainder of the key on cycle and the MIL will be
on.
234
BP High Pressure
This fault sets in the event the BP value is out of the normal range.
235
BP Low Pressure
This fault sets in the event the BP value is out of the normal range.
242
Crank Sync Noise
The EPM must see a valid Crankshaft position signal while running. If
no signal is present for 800ms or longer, this fault will set.
243
Never Crank Synced At Start
The EPM must see a valid Crankshaft Position signal while cranking
before it starts. If no signal is present within 4 cranking revs, this fault
will set.
244
Camshaft Sensor Loss
The Camshaft Position Sensor is used to determine which cylinder to
fire. This fault will set if the EPM does not detect a cam pulse when the
RPM is greater than 1000. Normally the engine will run with this fault
present. In some instances this fault may cause rough engine opera-
tion.
245
Camshaft Sensor Noise
This fault will set if the EPM detects erroneous pulses from the cam-
shaft position sensor causing invalid cam re-sync.
253
Knock Sensor Open
This fault will set if the Knock Sensor input to the EPM is less than 0.2
volt while engine rpm is greater than 1500 and MAP is greater than 8
psia.
254
Excessive Knock Signal
This fault will set if the Knock Sensor input to the EPM is greater than
4.5 volts while MAP is less than 8 psia and knock spark retard is at
maximum.
311
Injector Driver #1 Open (2.5L)
This fault will set if the EPM detects low feedback voltage on the inter-
nal injector while the injector drive circuit is in the off-state and battery
voltage is greater than 9 volts.
312
Injector Driver #1 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.
313
Injector Driver #2 Open (2.5L)
This fault will set if the EPM detects low feedback voltage on the inter-
nal injector while the injector drive circuit is in the off- state and bat-
tery voltage is greater than 9 volts.
314
Injector Driver #2 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.
315
Injector Driver #3 Open (2.5L)
This fault will set if the EPM detects low feedback voltage on the inter-
nal injector while the injector drive circuit is in the off-state and battery
voltage is greater than 9 volts.
316
Injector Driver #3 Shorted (2.5L)
This fault will set if the EPM detects low feedback voltage on the inter-
nal injector while the injector drive circuit is in the off-state and battery
voltage is greater than 9 volts.
Table 3-11. EPM Diagnostic Trouble Codes
Diagnostic
Trouble
Code
Description
Cause for Setting DTC