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Here is the illustration show the service steps for JCB Backhoe Loaders 3CX/4CX/5CX hand throttle position sensor.
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Function
Determines hand throttle position set by the operator.
Location
On Backhoe Loader machines, the hand throttle position sensor is mounted under the front console.
Signal
Analogue voltage between 0 volts and 5 volts. Voltage output proportional to throttle lever position. Two throttle tracks are used to ensure safety of the operator in the case of throttle malfunction.
Internal Electrical Schematic
Testing
Important: Use the multi-meter on the harness connector pins. DO NOT use the meter on the ECU pins. (SN0011)
1 Disconnect the sensor.
2 Switch the ignition ON.
3 Check supply voltage is 5 volts (pins 1 and 4). Connector pin 3 and 6 should read ground (0 volts).
4 If voltages are incorrect, check harness for continuity and ground conditions, check ECU pins for evidence of contamination or corrosion.
5 Measure signal voltage from the throttle position sensor when the throttle is at idle.
a)Pin 2 = 1.0 to 1.2 volts.
b)Pin 5 = 0.4 to 0.6 volts.
6 Measure signal voltage when throttle is fully depressed.
a)Pin 2
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