FAQ | Komatsu support

How to Clear a Komatsu Excavator DEF Injector Overheat Inducement

If a Komatsu excavator is stuck in an inducement because of the DEF injector overheat counter, you can reset that counter through the monitor’s diagnostic-test path using the exact keypad sequence below.

Applies to: Komatsu excavators that need the DEF injector overheat inducement reset through the monitor menu.

Quick answer: hold 4, then press 1, 2, 3, open Diagnostic Test, select it, then enter 9, 5, Check. When the screen asks whether you want to reset the injector counter, select Yes.

Step-by-step reset procedure

  1. On the monitor, hold 4.
  2. While doing that, press 1, then 2, then 3.
    Hold 4, then press 1 2 3
  3. Open Diagnostic Test.
  4. Select the diagnostic-test option.
  5. Press 9, then 5, then Check.
    9 5 Check
  6. When the monitor asks Do you want to reset the injector counter?, select Yes.
Important: this is the short reset path for the DEF injector overheat inducement. If the counter resets but the machine comes right back with the same problem, the next step is to diagnose why the overheat condition returned instead of only repeating the reset.

When this FAQ helps most

Good fit

  • The machine is already showing a DEF injector overheat inducement.
  • You need the exact Komatsu monitor sequence, not a long general troubleshooting article.
  • You want the shortest path to the injector-counter reset prompt.

If the issue comes back

  • Record the exact machine model.
  • Check whether the machine is returning with the same DEF injector overheat fault again.
  • Gather any active codes or warning messages before the next reset attempt.
  • If needed, send the machine details to TM AG so the root cause can be checked instead of only resetting the inducement repeatedly.
Good practice: if this reset path is being used for customer support, it is worth confirming the exact Komatsu model and current symptoms first so the reset is tied to the right issue and not used as a generic catch-all button sequence.

Need help from TM AG?

If you want us to confirm the right next move, send the Komatsu excavator model, the active fault or message on the screen, and what happened before the inducement appeared. That makes it easier to tell whether the reset is all that is needed or whether the machine needs deeper diagnosis.