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The following considerations should be taken into account when troubleshooting overall system fail
codes:
All fails are reset on ECU boot up so it is recommended that the user take note of any
codes prior to shutting off master power.
The only way to clear out a fail code is to cycle master power. Fail codes are not cleared
by a fail fixing itself while running. Cycling ignition power also does not clear fails.
Example: A sensor fails while driving around on track. The DIAG_LED will start flashing to
indicate the failure. Once the driver pulls back into the pits, they turn off the ignition switch to
shut off the engine. The master power switch is still on so the DIAG_LED is still flashing. The
driver should write down the fail code. The driver now can cycle master power to clear the
code; when the ECU boots back up the fail is cleared and the DIAG_LED no longer is flashing.
Fail checking will begin again so if the fail is still present it will be diagnosed again and the
DIAG_LED will once again flash the code.
HPD L15A7 Electrical Systems Manual
9
2/2010
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