TROUBLESHOOTING

ERROR CODE DH21KA (WORK EQUIPMENT PUMP OIL PRESSURE SENSOR:

DISCONNECTION (KA))

ERROR CODE DH21KA (WORK EQUIPMENT PUMP OIL PRESSURE SENSOR:DISCONNECTION (KA))

Circuit diagram related to work equipment pump oil pressure sensor

Action code Error codeTrouble

Work equipment pump oil pressure sensor: Disconnection (KA)

(Transmission controller system)E01 DH21KA

Contents of

trouble Signal voltage of work equipment pump oil pressure sensor circuit is below 0.5V.

Action of

controller Does not take any particular action.

Problem that

appears on

machine

Work equipment pump oil pressure cannot be monitored.

Related

information

Input (Voltage) from work equipment pump oil pressure sensor can be checked in monitoring mode.

(Code 70701: Voltage of work equipment pump oil sensor)

Method of reproducing error code: Turn starting switch ON.

Possible causes

and standard

value in normal

state

Cause Standard value in normal state/Remarks on troubleshooting

1Defective 24V power source

system

See if error code [DAQ6KK] is displayed. If it is displayed, carry out

troubleshooting for it first.

2

Defective work equipment

pump oil pressure sensor

(Internal trouble)

aPrepare with starting switch OFF, turn starting switch ON and carry

out troubleshooting.

HHP Voltage

BetweenC A 0.5 6.0V

3

Disconnection in wiring har-

ness (Disconnection in wir-

ing or defective contact in

connector)

aPrepare with starting switch OFF, then carry out troubleshooting

without turning starting switch ON.

Wiring harness between TMCN1 (female)F

HHP (female)BResistance Max. 1z

Wiring harness between TMCN1 (female)9

HHP (female)CResistance Max. 1z

4

Short circuit with chassis

ground in wiring harness

(Contact with ground circuit)

aPrepare with starting switch OFF, then carry out troubleshooting

without turning starting switch ON.

Short circuit of wiring harness between

TMCN1 (female)9 HHP (female)C with

chassis ground

Resistance Min. 1Mz

5Defective transmission con-

troller

aPrepare with starting switch OFF, turn starting switch ON and carry

out troubleshooting.

TMCN1 (female) Voltage

Between9 K 0.5 6.0V