SPEED CIRCUIT

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CONTINUED

3-2. TROUBLESHOOTING

1. SPEED CIRCUIT

(1) ES-45. ENGINE SPEED CIRCUIT

FAULTY.

This section contains troubleshooting to determine and correct the

cause(s) of a faulty engine speed circuit. The engine output speed is

sensed by two independent speedometer adapters located on the rear cover

of the reduction gearbox (RGB) and coupled to the electronic control

unit (ECU) by an electrical cable. If both speedometer adapter circuits

a r e f a u l t y , engine output RPM will not be indicated and the ECU will

induce a protective mode of operation. The art on this page provides an

overview of the engine output speed circuit described above. Refer to

this page along with in-text art while doing troubleshooting.

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