Applicable Systems
PC200 Excavator
Symptoms
The Komatsu equipment displays error code T04 on the monitor panel. Transmission Solenoid Valve Abnormal has been detected. The warning lamp illuminates and the equipment may enter derate or shutdown mode depending on severity.
Possible Causes
- Transmission Solenoid Valve Abnormal - sensor or component failure
- Wiring harness or connector fault
- ECM or controller internal fault
- Fluid level, pressure, or temperature out of specification
- Mechanical failure of related component
Troubleshooting Steps
- Step 1: Connect Komatsu PC-based diagnostic tool (KOMTRAX) and read all active and historical codes
All codes are retrieved with timestamps - Step 2: Inspect wiring harness and connectors for the related system
No damage, corrosion, or loose connections found - Step 3: Use a multimeter to check sensor signals, actuator circuits, and power supplies per Komatsu service manual
Values are within specification - Step 4: Check fluid levels, pressures, and temperatures as applicable to the code
Fluids are at proper level and condition - Step 5: Clear codes and operate equipment to verify repair
Code does not return and system operates normally
How to Reset
To reset Komatsu code T04: 1) Repair the underlying fault. 2) Use the diagnostic tool to clear the code. 3) Cycle the key switch. 4) Operate equipment to verify. Caution: Ensure root cause is resolved before clearing.
Frequently Asked Questions
- Q: What does Komatsu code T04 mean?
Code T04 indicates: Transmission Solenoid Valve Abnormal. This is a Komatsu KOMTRAX diagnostic code related to Transmission.
- Q: How serious is Komatsu code T04?
Severity: Major. Reduce load and seek service.
Source: Komatsu Service Manual / KOMTRAX Diagnostic System - verified via BING International
Category: Heavy Equipment