SECTION 3 - CHASSIS & TURNTABLE
3121142
– JLG Lift –
3-187
DTC 9999- Throttle Actuator Failsafe Spring
Failure
• Throttle Actuator
• Check Condition- Key Off, Engine Stopped
• Fault Condition- When the key is off (or the actuator is
unpowered), the ECM is expecting the failsafe spring in the
actuator to return the throttle position to near 0%. If the
throttle does not reach this position when the actuator is
powered, a fault is generated.
• Corrective Action(s)- Illuminate MIL, sound audible warn-
ing or illuminate secondary warning lamp. Govern the
engine speed to a forced idle speed.
• Non-emissions related fault
The throttle actuator has a return spring that causes the throt-
tle to move to a near 0% position when powered off. This
causes the engine to shutdown following a key off. If the ECM
detects the throttle position to be above x volts when the key
is off (as determined by the diagnostic calibration), it will
power up the actuator and attempt to drive it to a zero posi-
tion. This should ensure that the engine is stopped.
This fault will set if the throttle does not return to a near 0%
position with the key is off.
Diagnostic Aids
• Disconnect the throttle actuator from the wire harness.
Remove the throttle actuator from the engine and manu-
ally move it. Verify that the internal spring forces the throt-
tle back to near 0% position.
• Inspect the throttle arm or fuel rack on the fuel pump. Ver-
ify that it is not stuck.
PINK/WHITE
4
3
5
1
2
TAN/ORANGE
GREEN/RED
PURPLE/BLUE
BLACK/GREEN
Summary of Contents for 1200SJP
Page 1: ...Service and Maintenance Manual Models 1200SJP 1350SJP P N 3121142 November 8 2016 AS NZS...
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Page 58: ...SECTION 3 CHASSIS TURNTABLE 3 12 JLG Lift 3121142 Figure 3 11 Axle Loctite Application...
Page 64: ...SECTION 3 CHASSIS TURNTABLE 3 18 JLG Lift 3121142 Figure 3 13 Drive Hub Sheet 1 of 2...
Page 173: ...SECTION 3 CHASSIS TURNTABLE 3121142 JLG Lift 3 127 Figure 3 75 EMR2 Fault Codes Sheet 1 of 5...
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Page 248: ...SECTION 4 BOOM PLATFORM 4 14 JLG Lift 3121142 Figure 4 7 Boom Assembly Sheet 7 of 7...
Page 305: ...SECTION 4 BOOM PLATFORM 3121142 JLG Lift 4 71 Figure 4 31 Outer Mid Boom Extend Retract Cables...
Page 306: ...SECTION 4 BOOM PLATFORM 4 72 JLG Lift 3121142 Figure 4 32 Fly Boom Extend Retract Cables...
Page 323: ...SECTION 4 BOOM PLATFORM 3121142 JLG Lift 4 89 Figure 4 37 Rotator Counterbalance Valve...
Page 352: ...SECTION 5 HYDRAULICS 5 28 JLG Lift 3121142 Figure 5 28 Steer Pressure Adjustments...
Page 379: ...SECTION 6 JLG CONTROL SYSTEM 3121142 JLG Lift 6 3 Figure 6 2 Control System Block Diagram...
Page 388: ...SECTION 6 JLG CONTROL SYSTEM 6 12 JLG Lift 3121142 Figure 6 10 Control Module Location...
Page 457: ...SECTION 6 JLG CONTROL SYSTEM 3121142 JLG Lift 6 81 Figure 6 24 Fault Code Light Location...
Page 490: ...SECTION 6 JLG CONTROL SYSTEM 6 114 JLG Lift 3121142 Figure 6 31 CANbus Circuit...
Page 508: ...SECTION 6 JLG CONTROL SYSTEM 6 132 JLG Lift 3121142 Figure 6 32 Moment Chart...
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