JCB 3CX/4CX/5CX Foot Throttle Position Sensor Remove/Install and Test Guide

Foot throttle position sensor determines foot operated throttle position.This instruction show you guide on how to remove/install and test foot throttle position sensor for JCB 3CX/4CX/5CX backhoe loader.

 

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Location

The foot throttle pedal is vehicle mounted, normally on the right hand side of the cab adjacent to the driver’s foot.

The throttle position sensor (TPS) unit is located in the foot throttle pedal assembly.

Signal

Analogue voltage driven by a 5V sensor supply within the engine ECU. The signal output should always be between 0.5V and 4.5V. The voltage output is proportional to throttle lever position. Two throttle tracks are used to ensure safety of the operator in the case of throttle malfunction.

 

Wires and Connectors

 

STOP: Before proceeding check all the relevant wires and connectors for integrity.

 

Internal Electrical Schematic

 

Remove and Install

Remove

1 Make the machine safe and make sure it is switched OFF.

2 Remove the floor mat from the cab.

3 Work below the cab, disconnect the electrical connector from the chassis harness.

4 Remove the bolts.

5 Retain the spacer plate (if fitted).

6 Remove the nut to release the clip and electrical connector from the floor.

7 Slowly remove the throttle pedal assembly from inside the cab, make sure the electrical connector is pulled through the hole in the cab floor.

 

Install

Installation is the reversal of removal but note the following:

1 JCB threadlock and sealer is to be applied to the threads of the bolts.

 

Testing

Important: Use the multi-meter on the harness connector pins. DO NOT use the meter on the ECU pins.

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.

 

6Measure signal voltage when throttle is fully depressed.

a)Pin 2 – 4.0 to 4.5 volts.

b)Pin 5 – 2.2 to 2.5 volts.

 

Related Fault Codes

 

More repair case for JCB,please refer to:JCB Trouble Repair