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The Injec ECU will
show a warning code when it senses a problem that the operator needs to
attend to. These warning codes are as self explanatory as possible given
the space available.
WARNING:
WATER TEMP SENDER OPEN CIRCUIT
The
wire to the sensor has become detached or the sensor is faulty, i.e. open
circuit. Check the wiring for continuity and if no fault is found test
the sensor for nominal resistance.
WARNING: WATER TEMP SENDER SHORT CIRCUIT
The
sensor wire has shorted to ground, usually the vehicle body. Check for
open circuit fault with wire disconnected. If the fault changes state
then it is the sensor at fault.
WARNING:
AIR TEMP SENSOR OPEN / SHORT CIRCUIT
Testing
procedure is the same as for the water temp sensor.
WARNING:
THROTTLE POSITION WIPER SHORTED OR FAULTY
This
warning alerts the operator that the throttle position sensor is returning
a zero volts
signal to the ECU. This caused by either a lack of 5 volt supply or the
output being shorted to ground.
WARNING:
BATTERY VOLTAGE TOO HIGH
The
trigger for voltage too high is 15.5 Volts this is likely to be an alternator
or regulator fault. This must be corrected as damage to the battery will
certainly occur. Some alternators can output as high as 30 Volts when
the regulator fails
WARNING:
BATTERY VOLTAGE TOO LOW
If
the battery voltage drops below 9.6 Volts the Injec ECU may function erratically.
The lowest voltage is usually encountered at cranking. If you cannot maintain
at least 9.6 Volts then there is a need to repair this situation. Check
the no load vs full load cranking voltage available at the battery positive
terminal
WARNING:
INJECTORS FULL OPEN. ENGINE LEANING OFF
The
injectors have reached 95% duty cycle and cannot flow any more fuel. At
this point first check that the fuel pressure is maintained by the pump
under load. The pump chosen may not have sufficient flow at the regulated
pressure. If it has then either raise the fuel pressure or fit larger
injectors.
WARNING:
FULL LOAD STEP INCREASE TOO LARGE
This
message will be displayed if the operator has two adjacent settings that
are not very likely to be correct. i.e. 2000 rpm full load at 5.04 ms
and 2500 rpm full load at 11.02 ms. The “step increase is greater
than any engine would be likely to use.
WARNING:
PIP EDGE TO CYLINDER MISMATCH
If
the “number of cylinders is set to 4 and the “pip edges”
are set to 4 and the TDC input is set to “extra” then the
ECU would expect 5 pip edges per revolution.
There are many opportunities for incorrectly entering this critical information
and the Injec ECU
performs a “truth test” to see if the numbers make sense.
The engine can be test fired even if the warning is present.
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