ECU Self Diagnostic
Error Indicator Light
The ECU’s LED indicator flashes error codes to indicate fault conditions. En external error light
can be configured under menu M1--O/P Setup--O/P Error light.
If selecting it to any Stepper O/P or free ignition O/P and Invert they can drive any stock error
light that is grounded at the other end. These outputs when selecting invert (Press i in menu for
selecting output) will send +12Volt power to turn on light (normally they and all other outputs pull
to ground, meaning the error light has to have 12 volt ignition power at the other end). If online
with the ECU the errors will be displayed in the ECU Error History in a text format.
Error conditions include:-
• Faulty sensors.
• Out of range signals.
• Electrical interference.
• Operation endangering engine life.
• Internal ECU malfunction
This indicator is located near the main connector, and the SM4 allow connection of a remote
indicator light. Each time the ECU is activated (ignition on) previously detected HISTORY or old
error conditions are indicated. After the completion of the HISTORY error codes, error codes
are displayed as the errors are detected. An error code will remain stored in ECU memory until
the fault is repaired and the engine is warned-up (from cold to normal operating temperature) 20
times. This error memory feature allows the engines' user reasonable time to fault find difficult
intermittent faults, or drive in limp-home mode to qualified service for repair. When the repair is
effected the old stored error codes may be erased by using the laptop calibration program.
Error code format:-
• Error codes are all 2 digits, each digit comprising a number of 1/2 second on, 1/2
second off flashes.
• The 2 digits of each code are separated be 2.5 seconds.
• Error codes are separated by 5 second pause.
• As detected error codes can occur 10 seconds after the completion of the ignition on
HISTORY CODES.
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