SHOP MANUAL MT26-31 - 06.2005
Engine
Tier-3 710655-
Ch 1 page 32
Fault codes
Troubleshooting using flash codes for the ECU control unit
• The diagnostics lamp for the control unit always comes on for a second when the
system is powered up.
• As soon as a fault is detected by the control unit, a fault code is stored in the EEPROM
and the diagnostics lamp for the control unit (the left-hand lamp on the instrument panel) lights up.
• The diagnostics lamp will remain permanently lit for as long as a fault is
active. Even if the lamp has gone off and the fault is no longer active, the code can
generally be read off in accordance with the instruction below.
• The diagnostics lamp for the control unit stays on during engine shutdown for as
long as the control unit and coordinator are powered up.
Checking:
• Fault symptoms
• Conditions in which the fault occurs
• How often the fault occurs
• If the diagnostics lamp lit up when the fault occurred
• If the diagnostics lamp went out by itself when the fault ceased
• If the fault codes have been erased
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