SECTION 3 - CHASSIS & TURNTABLE
3-142
– JLG Lift –
3121142
DTC 118- ECT/CHT High Voltage
• Engine Coolant Temperature Sensor
• Check Condition-Engine Running
• Fault Condition-CHT/ECT sensor voltage higher than the
limit defined in the diagnostic calibration
• Corrective Action(s)- Sound audible warning or illuminate
secondary warning lamp, disable adaptive learn fueling
correction during active fault, or any combination thereof
as defined in calibration. Recommend a power derate 1/2
to reduce the possibility of engine damage due to the
inability to sense temperature.
• Non-emissions related fault
The Engine Coolant Temperature sensor is a thermistor (tem-
perature sensitive resistor) located in the engine coolant.
Some engines use an ECT sensor that is located in the coolant
near the thermostat. Some engines use a CHT (Cylinder Head
Temperature) sensor that is located in the coolant in the cylin-
der head. If the engine is equipped with an ECT sensor then
the CHT value is estimated. If equipped with a CHT sensor then
the ECT value is estimated. The ECM provides a voltage divider
circuit so that when the coolant is cool, the signal reads higher
voltage, and lower when warm.
This fault will set if the signal voltage is higher than the high
voltage limit as defined in the diagnostic calibration anytime
the engine is running. The limit is generally set to 4.90 VDC. In
many cases, this condition is caused by the CHT/ECT sensor
being disconnected from the engine harness, an open-circuit
or short-to-power of the CHT/ECT circuit in the wire harness,
or a failure of the sensor. The ECM will use a default value for
the CHT/ECT sensor in the event of this fault.
TAN/WHITE
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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