Failure Code [Ca689] Eng Ne Speed Sensor Error - Komatsu PC210-8 Shop Manual

Hydraulic excavator

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Failure code [CA689] Eng Ne Speed Sensor Error

Failure code

• There is error in signal from engine Ne speed sensor.

• Continues control with signal from engine Bkup speed sensor.

• Engine hunts.

Problem that

• Engine does not start easily.

• Engine output lowers.

Related infor-

• Method of reproducing failure code: Start engine.

Defective Ne speed sensor

power supply system

Defective engine Ne speed

Breakage or improper clear-

ance of engine Ne speed

Breakage of rotation sensor

Disconnection in wiring har-

ness (Disconnection in wiring

Possible causes

or defective contact in con-

and standard

value in normal

Ground fault in wiring har-

ness (Short circuit with GND

Hot short (Short circuit with

5V/24V circuit) in wiring har-

Short circuit in wiring har-

ness (with another wiring

Engine Ne speed sensor error

(Engine controller system)

Standard value in normal state/Remarks on troubleshooting

If failure code [CA238] is also displayed, carry out troubleshooting

for it first.

a Prepare with starting switch OFF, then turn starting switch ON

and carry out troubleshooting.

CRANK SENSOR

Between (1) – (2)

Voltage is measured with wiring harness connected. Accordingly, if

voltage is abnormal, check wiring harness and controller, too, for

another cause of trouble, and then judge.

Engine Ne speed sensor may be broken or may have improper

clearance. Check it directly.

Rotation sensor wheel may be broken. Check it directly.

a Prepare with starting switch OFF, then carry out troubleshooting

without turning starting switch ON.