JLG 1350SJP Service Manual - Manual (Page 232)

SECTION 3 - CHASSIS & TURNTABLE
3-186 – JLG Lift – 3121142
DTC 2112- Unable to Reach Higher TPS
• Throttle Position Sensor
• Check Condition-Cranking or Running
• Fault Condition-Throttle command is 20% more than
actual throttle position
• MIL-On during active fault
• Engine Shut Down
In the case of a diesel engine, an actuator controls a fuel injec-
tion pump, directly affecting the fueling level into the cylin-
ders. This may be by direct manipulation of the fuel injection
pump rack or by manipulation of the mechanical governor
control level or "throttle arm." In the DGC ECM and EDIS, refer-
ences to the throttle and throttle position sensor refer to these
fuel injection pump control actuators and their position feed-
back sensors. When the fuel injection pump is electronically
controlled it can be used to control the idle stability and limit
engine speed based on operating conditions.
The Throttle Position Sensor uses either 1) a variable resistor
and voltage divider circuit or 2) a non-contact hall-effect sen-
sor to determine throttle actuator position, and is located
within the throttle actuator.
There are two types of throttle actuators, 1) actuator with ana-
log position feedback and 2) actuator with digital position
feedback. The first type, with analog position feedback, pro-
vides an analog return signal between 0 and 5 volts that is pro-
portional to the throttle actuator position. The second type,
with digital position feedback, provides a serial data signal to
the ECM with the throttle actuator position voltage level
encoded in the data stream.
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.
PINK/WHITE 4
3
5
1
2
TAN/ORANGE
GREEN/RED
PURPLE/BLUE
BLACK/GREEN