TM 5-3805-281-24-1
Tests
READING SERVICE CODES WITHOUT EXCAVATOR DIAGNOSTICS PROGRAM
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4. Turn the key switch ON.
With practice the self-diagnostic service codes can be
read by counting the flashes of the Service Code
The LED comes ON steady for several seconds
Indicator Light (LED) (B) in the engine and pump
and then goes OFF.
controller (A).
5. For an existing service code, the LED starts a
Read the LED in the engine and pump controller
flashing sequence of 1 second ON, 1 second OFF
several times to make sure the correct service code is
intervals. After the last ON in a sequence, the LED
read.
remains OFF for approximately 3 seconds and then
repeats the flashing sequence.
1. Lower the bucket to the ground. Stop the engine.
Count the number of times LED is ON in a
2. Remove the rear console cover from behind the
sequence for the service code number.
operator's seat. Remove the bracket that is over the
engine and pump controller.
Example, for a service code "03 Rear pump
delivery pressure sensor failure," the LED flashes
3. Install a jumper wire (D) into the two top terminals
ON three times in each sequence.
of the diagnostic port (C).
Continued on next page
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