JCB 3CX/4CX/5CX Loader Hand Throttle Position Sensor Service Steps

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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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