Aeon 350cc, Service Manual

Page: 106 / 192

ELECTRONIC FUEL INJECTION
5-106
The ECU requires a minimum of 5.0 volts to operate. The
memory in the ECU is operational the moment the battery
cables are connected. To prevent engine over-speed and
possible failure, a delimiting feature is programmed into the
ECU. If the maximum RPM limit (8500) is exceeded, the ECU
suppresses the injection signals, cutting off the fuel flow. This
process repeats it self in rapid succession, limiting operation to
the preset maximum.
ECU SERVICE
Never attempt to disassemble the ECU. It is sealed to prevent
damage to internal components. Warranty is void if the case is
opened or tampered with in any way.
All operating and control functions within the ECU are pre-set.
No internal servicing or readjustment may be performed. If a
problem is encountered, and you determine the ECU to be
faulty, contact the AEON Service Department for specific
handling instructions. Do not replace the ECU without factory
authorization.
The relationship between the ECU and the throttle position
sensor (TPS) is very critical to proper system operation. If the
TPS is faulty, or the mounting position of the TPS to the
throttle body is altered, the TPS must be re-initialized (see TPS
Initialization for procedure if required).
For the purpose of troubleshooting, a known-good ECU from
another AEON ELITE 350i OR URBAN 350i EFI of the same
model may be used without system or engine component
damage.
ECU REPLACEMENT
1. Remove the (2) retaining screws holding the ECU.
2. With the Ignition turned off, disconnect the wire harness
from the ECU.
3. To install, reverse the procedures and tighten screws to
specification.
ECU Retaining Screws
2.5 Nm (22 in. lbs.)
IAT OPERATION OVERVIEW
Mounted in the throttle body intake boot.
Air passing through the intake is measured by the IAT and
relayed temperature readings to the ECU and compared to its
programming for determining the fuel and ignition
requirements during operation.
IAT TEST
The IAT is a sealed, non-serviceable assembly. If fault code
diagnosis indicates a problem within this sensor, test as
follows:
1. Disconnect IAT (2-wire) harness connector on the left-hand
side of throttle body boot.
2. Connect an ohmmeter between the pin terminals leading
from the Red and White wires. A resistance value of 2795±70
Ω
at room temperature (25
℃
/ 77
℉
) should be obtained.
Resistance Specification:
560 Ω Ω Ω Ω ±

 

10% (

 

25 ℃ ℃ ℃ ℃ / 77 ℉ ℉ ℉ ℉ )
CRANKSHAFT POSITION SENSOR