jcb JS300 Service Manual page 479

Tracked excavators - tier 4i isuzu engine

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For details about the engine ECU refer to the applicable

engine documentation. For more information about the

engine ECU and connected devices refer to Section K,

Electrical Components and Connections.

Wires and Connectors

The engine ECU has two harness connectors, the

machine harness connectors C250 and C251. For details

of the engine harness connector pin functions refer to the

applicable schematic diagram in this section. The pin

Fig 13. Harness Connectors C250, C251

Section C - Electrics

functions are also given in the applicable engine

documentation.

K Fig 14. ( T C-55)

The machine harnesses connect to a dedicated engine

harness 1 via five interconnects, IC20, IC21, IC33, IC18

and IC19. Refer to Harness Systems, Harness

Interconnections in this section.

Important: Do not touch the connector pins on the engine

ECU. Do not use a multi-meter on the engine ECU

connector pins, only use a multi-meter on the harness

connector pins.

Electronic Controllers

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