Fast 30400-KIT-EZ-EF Instructions Manual - page 64
64
On-Board Diagnostics
The EZ-EFI
®
system includes a robust self-diagnostics feature. The ECU constantly monitors various
inputs and outputs for any deviations from normal operation. If any are detected, the blue
CRANK/DIAG LED on the ECU flashes rapidly as a warning that there is a problem. (That LED
comes on solid when the ECU detects an RPM input. It will be lit solid while the engine is running
normally). Also, the “Error” LED displayed on the hand-held’s Live Dashes acts like a Check Engine
Light. It will signal if an error code has been set. The hand-held can be used to read any error codes
that have been set.
Once an error code is set, it is saved in the ECU until the ECU is reset by keying-off and allowing the
ECU to complete its shutdown procedure. The shutdown procedure is complete when both green
LEDs on the ECU turn off. This takes approximately 5-10 seconds. Error codes can also be cleared
with the hand-held at any time.
The following error codes are possible:
ERROR CODE
TRIGGERING EVENTS
ATS Voltage
Air Temperature Sensor signal voltage too high or too low
Battery Voltage
Battery voltage below 7V or above 19V for 10 seconds
CTS Voltage
Coolant Temperature Sensor signal voltage too high or too low
Fuel Pressure Control
In return fuel system mode:
Higher than expected (greater than 75 psi) fuel pressure detected.
The fuel pump is disabled in the event that a return‐style fuel system
(which runs the pump wide open)
was selected in the hand‐held
when there is no mechanical fuel pressure regulator and return line
actually installed in the vehicle. This prevents the pump from
straining against a closed system and building excess pressure.
The code can be cleared but the pump will remain disabled until the
ECU has been power cycled, or until the Fuel Delivery type has been
changed to “Returnless” on the Fuel System screen.
In returnless fuel system mode:
Lower than expected fuel pressure detected. The fuel pump control
output has maxed out at 100% while fuel pressure has remained
below the fuel pressure target. This usually indicates a physical
problem with the fuel system – leak, clogged filter, etc. The fuel
pump is not disabled.
Fuel Pressure Sensor
Fuel pressure sensor signal voltage too high or too low
IAC Control
Idle Air Control motor malfunctioning
Inj Duty Limit
Injector duty cycle over 100% (an indication that injectors cannot
supply enough fuel. The ECU has determined that the injectors need
to be open longer than the time available.)
MAP Voltage
Manifold Absolute Pressure sensor signal voltage too high or too low