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Komatsu WA470-5 TROUBLESHOOTING FAILURE CODE

FAILURE CODE [A000N1]

Description of Trouble: Engine speed exceeded operating range.

Controller Reaction: Stops fuel injection until engine speed lowers to operating range.

Effect on Machine: Engine speed fluctuates abnormally.

Related Information: Engine speed can be checked with monitoring function (Code: 01004).

Possible Causes and Standard Values:

1) Turn starting switch ON.
2) Operate machine monitor.

When machine is so used that engine will overrun.

Defective engine controller

1) Start engine.
2) Operate machine monitor.

Engine speed can be read normally. Engine speed cannot be read normally.

FAILURE CODE [AD00L2]

Description of Trouble: Common rail fuel pressure rose (Level 1).

Controller Reaction: Operates with limited output.

Effect on Machine:Engine output lowers.

Related Information:

• The common rail pressure can be checked with monitoring function (Code: 36400).
• The converted torque can be checked with monitoring function (Code: 36700).
• Engine speed can be checked with monitoring function (Code: 01004).

Possible Causes and Standard Values

Defect concerned to another error code

1) Turn starting switch ON. 2) Operate machine monitor.

Use of improper fuel

Proper fuel for atmospheric temperature is used.

Proper fuel for atmospheric temperature is not used.

Defective mechanical system of common rail fuel pressure sensor, clogging of overflow piping, defective overflow valve, defective pressure limiter, defective electrical system of common rail fuel pressure sensor

1) Loosen overflow valve joint of fuel supply pump.
2) Operate priming pump.

Defective overflow valve

1) Disassemble overflow valve of fuel supply pump.
2) Check inside of overflow valve.

Defective mechanical system of common rail fuel pressure sensor, clogging of overflow piping, defective pressure limiter, defective electrical system of common rail fuel pressure sensor

1) Perform this after performing 3.
2) Loosen joint of common rail pressure limiter.
3) Start engine.

Defective pressure limiter, defective electrical system of common rail fuel pressure sensor

1) Perform this after performing 5.
2) Perform troubleshooting for failure code [DH40KX].

FAILURE CODE [AD00MA]

Description of Trouble: Common rail fuel pressure rose (Level 2).

Controller Reaction: Operates with limited output and speed.

Effect on Machine: Engine output and speed lower.

Related Information:

• The common rail pressure can be checked with monitoring function (Code: 36400).
• The converted torque can be checked with monitoring function (Code: 36400).
• Engine speed can be checked with monitoring function (Code: 01004).

Possible Causes and Standard Values:

Perform troubleshooting for failure code [AD00L2].

FAILURE CODE [AD10L3]

Description of Trouble: Fuel supply pump does not supply fuel (Level 1).

Controller Reaction:

• Operates by normal control method.
• Even if cause of failure disappears, system does not reset itself until engine is stopped

Effect on Machine:

• Engine does not start easily.
• Engine output and speed becomes lower.
• Black smoke is produced.

Possible Causes and Standard Values:

  1. Trouble in related system
  2. Use of improper fuel
  3.  Defective low-pressure circuit parts
  4. Clogging of filter/strainer
  5. Trouble in electrical system of fuel supply pump PCV
  6. Defective common rail pressure sensor
  7. Defective pressure limiter
  8. Defective injector
  9. Defective fuel supply pump

FAILURE CODE [AD10MA]

Description of Trouble: Common rail fuel pressure is abnormal.

Controller Reaction:Operates by normal control method.

Effect on Machine:Engine output lowers.

Related Information:

• For reduced cylinder mode operation, see TESTING AND ADJUSTING.
• The common rail pressure can be checked with monitoring function (Code: 36400).
• The converted torque can be checked with monitoring function (Code 36700).
• Engine speed can be checked with monitoring function (Code: 01004).

Possible Causes and Standard Values: Perform troubleshooting for failure code [AD00L2].

FAILURE CODE [AD10MB]

Description of Trouble: Fuel supply pump does not supply fuel (Level 2)

Controller Reaction:

• Operates with limited output and speed.
• Even if cause of failure disappears, system does not reset itself until engine is stopped.

Effect on Machine: Engine speed is limited to 1,400 – 1,500 rpm.

Possible Causes and Standard Values: Defective device related to common rail

FAILURE CODE [AD11KA]

Description of Trouble: Fuel supply pump PCV1 system is disconnected.

Controller Reaction: Turns OFF output to fuel supply pump PCV1.

Effect on Machine: Machine is not affected particularly. (If failure code [AD51KA] is displayed simultaneously, however, engine stops.

Related Information:

• For reduced cylinder mode operation, see TESTING AND ADJUSTING.
• The converted torque can be checked with monitoring function (Code 36700).
• Engine speed can be checked with monitoring function (Code: 01004).

Possible Causes and Standard Values:

1) Turn starting switch OFF.

2) Disconnect connector PCV1.
3) Connect T-adapter.

Disconnection in wiring harness (disconnection, defective contact)

1) Turn starting switch OFF.
2) Disconnect connector L83 and PCV1.
3) Connect T-adapter.

Short circuit with chassis ground in wiring harness

1) Turn starting switch OFF.
2) Disconnect connector L83 and PCV1.
3) Connect T-adapter.

Defective engine controller

1) Turn starting switch OFF.
2) Disconnect connector L83 and PCV1.
3) Connect T-adapter.

FAILURE CODE [AD11KB]

FAILURE CODE [AD51KA]

FAILURE CODE [AD51KB]

FAILURE CODE [ADA1KA]

FAILURE CODE [ADAZKB]

FAILURE CODE [ADB1KA]

FAILURE CODE [ADC1KA]

FAILURE CODE [ADD1KA]

FAILURE CODE [ADDZKB]

FAILURE CODE [ADE1KA]

FAILURE CODE [ADF1KA]

FAILURE CODE [D182KZ]

FAILURE CODE [D1D0KB]

FAILURE CODE [DB20KT]

FAILURE CODE [DB22KK]

FAILURE CODE [DB29KQ]

FAILURE CODE [DB2AMA]

FAILURE CODE [DD11KB]

FAILURE CODE [DGE3L6]

FAILURE CODE [DGE4KX]

FAILURE CODE [DH30KX]

FAILURE CODE [DH40KX]

FAILURE CODE [DK10KX]

FAILURE CODE [DLE3LC]

FAILURE CODE [DLH1LC]

Failure Code [1500L1] (Double engagement detected) is displayed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-421
Failure Code [15SAL1] (F_ECMV F_ECMV fill switch system short-circuited) is displayed . . . . . . . . . . . 20-422
Failure Code [15SALH](F_ECMV fill switch system disconnected) is displayed. . . . . . . . . . . . . . . . . . . . 20-423
Failure Code [15SBL1] (R_ECMV fill switch system short-circuited) is displayed . . . . . . . . . . . . . . . . . . 20-424
Failure Code [15SBLH](R_ECMV fill switch system disconnected) is displayed . . . . . . . . . . . . . . . . . . . 20-425
Failure Code [15SEL1] (1st_ECMV fill switch system short-circuited) is displayed . . . . . . . . . . . . . . . . . 20-426
Failure Code [15SELH] (1st_ECMV fill switch system disconnected) is displayed . . . . . . . . . . . . . . . . . . 20-427
Failure Code [15SFL1] (2nd_ECMV fill switch system short-circuited) is displayed . . . . . . . . . . . . . . . . 20-428
Failure Code [15SFLH] (2nd_ECMV fill switch system disconnected) is displayed . . . . . . . . . . . . . . . . . 20-429
Failure Code [15SGL1] (3rd_ECMV fill switch system short-circuited) is displayed . . . . . . . . . . . . . . . . . 20-430
Failure Code [15SGLH](3rd_ECMV fill switch system disconnected) is displayed . . . . . . . . . . . . . . . . . . 20-431
Failure Code [15SHL1] (4th_ECMV fill switch system short-circuited) is displayed . . . . . . . . . . . . . . . . . 20-432
Failure Code [15SHLH](4th_ECMV fill switch system disconnected) is displayed . . . . . . . . . . . . . . . . . . 20-433
Failure Code [15SJL1] (Lockup_ECMV fill switch system short-circuited) is displayed. . . . . . . . . . . . . . 20-434
Failure Code [15SJLH] (Lockup_ECMV fill switch system disconnected) is displayed. . . . . . . . . . . . . . . 20-435
Failure Code [989F00] (Transmission protection caution) is displayed . . . . . . . . . . . . . . . . . . . . . . . . . . 20-436
Failure Code [B@C7NS](Rear brake cooling oil overheat) is displayed . . . . . . . . . . . . . . . . . . . . . . . . . . 20-438
Failure Code [D150KA](Emergency steering relay output system disconnected) is displayed. . . . . . . . 20-439
Failure Code [D150KB]Emergency steering relay output system grounded) is displayed . . . . . . . . . . . 20-440
Failure Code [D160KA](Backup lamp relay output system disconnected) is displayed. . . . . . . . . . . . . . 20-441
Failure Code [D160KB](Backup lamp relay output system grounded) is displayed. . . . . . . . . . . . . . . . . 20-442
Failure Code [D191KA](Neutral safety relay output system disconnected) is displayed. . . . . . . . . . . . . 20-444
Failure Code [D191KB](Neutral safety relay output system grounded) is displayed [*] . . . . . . . . . . . . . 20-446
Failure Code [D192KA](ECSS relay output system disconnected) is displayed [*] . . . . . . . . . . . . . . . . . 20-448
Failure Code [D192KB](ECSS relay output system grounded) is displayed . . . . . . . . . . . . . . . . . . . . . . . 20-449
Failure Code [DAQ0KK](Controller power supply voltage lowered) is displayed . . . . . . . . . . . . . . . . . . 20-450
Failure Code [DAQ2KK](Defective solenoid power supply system) is displayed . . . . . . . . . . . . . . . . . . . 20-451
Failure Code [DAQ9KQ](Model selection signal mismatch) is displayed . . . . . . . . . . . . . . . . . . . . . . . . . 20-452
Failure Code [DDK3KA](Right FNR switch signal not input) is displayed . . . . . . . . . . . . . . . . . . . . . . . . . 20-454
Failure Code [DDK3KB](Multiple right FNR switch signal input) is displayed . . . . . . . . . . . . . . . . . . . . . 20-456
Failure Code [DDK6KA](Forward-reverse lever signal not input) is displayed . . . . . . . . . . . . . . . . . . . . . 20-458
Failure Code [DDK6KB](Multiple forward-reverse lever signal input) is displayed . . . . . . . . . . . . . . . . . 20-460
Failure Code [DDS5KA](Steering pressure switch disconnected) is displayed . . . . . . . . . . . . . . . . . . . . 20-462
Failure Code [DDS5KB](Steering pressure switch grounded) is displayed. . . . . . . . . . . . . . . . . . . . . . . . 20-463
Failure Code [DDT0L4](Manual/auto-shift selector switch selection failure) is displayed. . . . . . . . . . . . 20-464
Failure Code [DDT4LD](Ground fault of transmission cut-off setting switch) is displayed . . . . . . . . . . . 20-466
Failure Code [DDW9LD](Ground fault of kickdown switch system) is displayed . . . . . . . . . . . . . . . . . . . 20-467
Failure code [DDWLLD](Ground fault of hold switch system) is displayed . . . . . . . . . . . . . . . . . . . . . . . 20-468
Failure Code [DF10KA](No input of gear shift lever signal) is displayed . . . . . . . . . . . . . . . . . . . . . . . . . 20-470
Failure Code [DF10KB](Input of multiple gear shift lever signals) is displayed . . . . . . . . . . . . . . . . . . . . 20-472
Failure Code [DGF1KX](Transmission oil temperature sensor system failure) is displayed. . . . . . . . . . 20-474
Failure Code [DGR2KA](Rear brake oil temperature sensor system disconnection) is displayed . . . . . 20-475
Failure Code [DGR2KB](Ground fault of rear brake oil temperature sensor system) is displayed . . . . . 20-476
Failure Code [DHT1KX]Transmission cut-off (left brake pressure sensor) signal discontinuity)
is displayed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-477
Failure Code [DLE2KA](Engine revolution sensor system discontinuity) is displayed . . . . . . . . . . . . . . 20-478
Failure Code [DLE2LC] (Engine revolution sensor failure) is displayed. . . . . . . . . . . . . . . . . . . . . . . . . . . 20-479
Failure Code [DLT3KA](Speed sensor (transmission revolution sensor failure) system discontinuity)
is displayed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-480
Failure Code [DT20KB](Ground fault of built-in indicator lamp system of transmission cut-off switch)
is displayed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-481
Failure Code [DW7BKA](Fan pump reverse solenoid system discontinuity) is displayed. . . . . . . . . . . . 20-482
Failure Code [DW7BKB](Fan reverse solenoid system short-circuiting) is displayed . . . . . . . . . . . . . . . 20-483
Failure Code [DW7CKA](Switch pump cut-off relay discontinuity) is displayed . . . . . . . . . . . . . . . . . . . 20-484

Failure Code [DW7CKB](Switch pump cut-off relay ground fault) is displayed . . . . . . . . . . . . . . . . . . . . 20-485
Failure Code [DX16KA](Fan pump EPC solenoid system discontinuity) is displayed . . . . . . . . . . . . . . . 20-486
Failure Code [DX16KB](Fan pump EPC solenoid system ground fault) is displayed. . . . . . . . . . . . . . . . 20-487
Failure Code [DXH1KA](Lock-up clutch _ECMV solenoid system discontinuity) is displayed . . . . . . . . 20-488
Failure Code [DXH1KB](Lock-up clutch _ECMV solenoid system short-circuiting) is displayed. . . . . . . 20-489
Failure Code [DXH4KA](1st_ECMV solenoid system discontinuity) is displayed . . . . . . . . . . . . . . . . . . . 20-490
Failure Code [DXH4KB](1st_ECMV solenoid system short-circuiting) is displayed . . . . . . . . . . . . . . . . . 20-491
Failure Code [DXH5KA](2nd_ECMV solenoid system discontinuity) is displayed . . . . . . . . . . . . . . . . . . 20-492
Failure Code [DXH5KB](2nd_ECMV solenoid system short-circuiting) is displayed . . . . . . . . . . . . . . . . 20-493
Failure Code [DXH6KA](3rd_ECMV solenoid system discontinuity) is displayed . . . . . . . . . . . . . . . . . . 20-494
Failure Code [DXH6KB](3rd_ECMV solenoid system short-circuiting) is displayed. . . . . . . . . . . . . . . . . 20-495
Failure Code [DXH7KA](R_ECMV solenoid system discontinuity) is displayed . . . . . . . . . . . . . . . . . . . . 20-496
Failure Code [DXH7KB](R_ECMV solenoid system ground fault) is displayed. . . . . . . . . . . . . . . . . . . . . 20-497
Failure Code [DXH8KA](F_ECMV solenoid system discontinuity) is displayed . . . . . . . . . . . . . . . . . . . . 20-498
Failure Code [DXH8KB](F_ECMV solenoid system ground fault) is displayed . . . . . . . . . . . . . . . . . . . . . 20-499
Failure Code [DXHHKA](4th_ECMV solenoid system discontinuity) is displayed . . . . . . . . . . . . . . . . . . 20-500
Failure Code [DXHHKB](4th_ECMV solenoid system short-circuiting) is displayed . . . . . . . . . . . . . . . . 20-501
Failure Code [DY30MA](Motor-driven emergency steering pump error (malfunction in manual mode))
is displayed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-502
Failure Code [DY30MC](Motor-driven emergency steering pump error (malfunction in manual mode))
is displayed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-504
Troubleshooting Code [TM-1] (Discontinuity or hot short-circuiting of kickdown switch system) . . 20-506
Troubleshooting Code [TM-2] (Hold switch system discontinuity or hot short-circuiting
(no hold control performed by pressing hold switch)) . . . . . . . . . . 20-506-2
Troubleshooting Code [TM-3] (Torque converter lock-up switch system failure (no lock-up
performed or no lock-up cancellation performed)) . . . . . . . . . . . . . . . 20-508
Troubleshooting Code [TM-4] (Neutralizer signal (parking brake switch signal) system failure) . . . 20-510
Troubleshooting Code [TM-5] (Emergency steering switch (motor-driven emergency steering
operation switch) signal system failure) . . . . . . . . . . . . . . . . . . . . . . . 20-512
Troubleshooting Code [TM-6] (Transmission cut-off switch system discontinuity or ground fault)
20-514
Troubleshooting Code [TM-7] (Transmission cut-off switch system discontinuity or
hot short-circuiting) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-515
Troubleshooting Code [TM-8] (Transmission cut-off (left brake sensor) signal short-circuiting) . . . 20-516
Troubleshooting Code [TM-9-a] (Joystick SHIFT_UP/SHIFT_DOWN switch system failure
(discontinuity or ground fault)) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-517
Troubleshooting Code [TM-9-b] (FNR switch mode change over switch system failure) . . . . . . . . . . . 20-518
Troubleshooting Code [TM-10] (Starting switch “C” (IGN_C) signal system failure). . . . . . . . . . . . . . . 20-520
Troubleshooting Code [TM-11] (Joystick ON/OFF change over switch system failure) . . . . . . . . . . . . 20-522
Troubleshooting Code [TM-12] (Engine power mode switch discontinuity or ground fault) . . . . . . . . 20-524
Troubleshooting Code [TM-13] (ECSS ON/OFF switch discontinuity or ground) [*]. . . . . . . . . . . . . . . 20-525
Troubleshooting Code [TM-14] (Hydraulic fan reverse switch signal system
hot short-circuiting or discontinuity) . . . . . . . . . . . . . . . . . . . . . . . . . . 20-526
Troubleshooting Code [TM-15] (Motor-driven emergency steering relay output system
hot short-circuiting) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-528
Troubleshooting Code [TM-16] (ECSS relay output system hot short-circuiting) [*] . . . . . . . . . . . . . . . 20-529
Troubleshooting Code [TM-17] (Switch pump cut-off relay output system hot short-circuiting) . . . . 20-530
Troubleshooting Code [TM-18] (Back lamp relay output system hot short-circuiting) . . . . . . . . . . . . . 20-531
Troubleshooting Code [TM-19] (Neutral output system hot short-circuiting) . . . . . . . . . . . . . . . . . . . . 20-532
Troubleshooting Code [TM-20] (F ECMV solenoid system hot short-circuiting) . . . . . . . . . . . . . . . . . . 20-533
Troubleshooting Code [TM-21] (R ECMV solenoid system hot short-circuiting) . . . . . . . . . . . . . . . . . . 20-534
Troubleshooting Code [TM-22] (1st ECMV solenoid system hot short-circuiting) . . . . . . . . . . . . . . . . 20-535
Troubleshooting Code [TM-23] (2nd ECMV solenoid system hot short-circuiting) . . . . . . . . . . . . . . . . 20-536
Troubleshooting Code [TM-24] (3rd ECMV solenoid system hot short-circuiting) . . . . . . . . . . . . . . . . 20-537
Troubleshooting Code [TM-25] (4th ECMV solenoid system hot short-circuiting) . . . . . . . . . . . . . . . . 20-538
Troubleshooting Code [TM-26] (Lock-up ECMV solenoid system hot short-circuiting) . . . . . . . . . . . . 20-539
Troubleshooting Code [TM-27] (Fan pump EPC solenoid system hot short-circuiting) . . . . . . . . . . . . 20-540
Troubleshooting Code [TM-28] (Fan reverse solenoid system hot short-circuiting) . . . . . . . . . . . . . . . 20-541
Troubleshooting Code [TM-29] (Speed sensor (transmission output shaft revolution) system failure) . . . . . .  . . . . 20-542
Troubleshooting Code [TM-30] (ECSS solenoid system discontinuity or ground fault) . . . . . . .  . . . . 20-543

Related files:

468

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