Cummins ISX

Turn the key switch OFF and move the diagnostic switch to the ON position. Turn the key switch to the ON position. If no active fault codes are recorded, both lights will come on and stay on. If active fault codes are recorded, both lights will come on momentarily then begin to flash the code of the recorded faults.

The fault code will flash in the following sequence:
- First, a WARNING (amber) light will flash.
- Then there will be a short one or two second pause after which the number of the recorded fault code will flash in STOP (red).
- There will be a one or two second pause between each number.
- When the number has finished flashing in red, an amber light will appear again.

The lights flash each fault code out three times before advancing to the next code.


If you get a code, post it and I'll try to help. If you do not, then the fault is not currently active. Only a computer an software can pull logged codes.