Driver Technique

You must use the diagnostic switch installed in the vehicle cab to flash out fault codes with the operator fault lamps. To check for active engine fault codes and maintenance indicator codes, turn the keyswitch to the OFF position and move the diagnostic switch to the ON position. Now turn the keyswitch to the ON position. If no active fault codes are recorded, both the warning and stop lamps will illuminate and remain on. If active faults are recorded, both the warning and stop lamps will illuminate momentarily and then begin to flash the codes of the recorded faults.

The fault code will flash in the following sequence:

  • A yellow warning lamp will flash

  • There will be a short 1 - 2 second pause

  • The fault code will flash on the red stop lamp

  • There will be a short 1 - 2 second pause between each number

When the number has finished flashing in red, a yellow warning lamp will appear again. The fault code will repeat the sequence.

Each fault code will flash twice before advancing to the next code.