On-Board Diagnostics - Westerbeke 6.5 MCG Service Manual

ON-BOARD DIAGNOSTICS 1 PC INTERFACE SOFTWARE
After installing the PC Interrace Diagnostics Software on
your laptop, shut off the
20
amp DC breaker on the
generators control box. Attach one end of the Westerbeke
communication cable
to
one of your laptops serial ports.
If your laptop does not have a serial port, you must use an
adapter that goes from a serial port to a USB. Attach the
other end of the communication cable
to
the 10 pin
connection on the ECU. Make sure that the red wire on the
communications cable lines up with the pin number 1 on
the ECU. Reference the label on the ECU to identify pin
number
1.
Tum on the 20 amp DC breaker
as
soon
as
the
communication cable is connected to both the ECU and
your laptop.
Open the Interrace Software and under communication select
comm port. Select the comm port that the cable is connected
to. Under communication select start comm or crtl 'tS. The
word communication under the menu bar should turn from
RED
to
GREEN if the communication link is properly
achieved. If it does not tum green, check the connections
at the PC and the ECU. Make sure that the connector is
properly positioined on the ECU and that all the pins
are
in
the connector. Verify the computer Comm Port selected is
correct. Make sure the main DC circuit breaker is turned on.
The ECll interface is divided into four sections. Engine
Conditions, Wzdeband 02 Sensor Control, Engine Control
States and Emissions Records Display.
ENGINE CONDITIONS
This section monitors the running conditions of the engine.
Coolant Temperature
Coolant temperature is displayed in degrees C and degrees F.
Air Temperature
Air temperature is displayed in degrees C and degrees F.
Engine Oil Pressure
. Oil pressure is displayed in BAR and PSI.
Battery Voltage
Battery voltage at the ECU is displayed in V de.
Engine Hours
Engine runtime is displayed in hours.
Engine Speed
Engine speed is displayed in RPM.
60Hz operation= 1800 rpm and 50Hz operation= 1500 rpm.
Lambda
ExhaustAir/Fuel mixture. You should see readings going
abve and below 1.000 continuously as the ECU adjusts the
Air/Fuel mxture.
Throttle Position
Indicates the position of the throttle control unit in steps
relative to the fully closed position.
Pulse Width
In9icates the fuel injector pulse width.
Manifold Pressure
Indicates the pressure in the intake manifold in kPa.
WIDEBAND 02 SENSOR CONTROL
This section monitors the operating conditions of the
wideband oxygen sen'sor.
WB 02 Sensor States
There are seven wide band sensor states.
1. WB Time Stamp is the initialization state for the wide
band lambda sensor.
2. WB OL Delay occures during the post-crank enrichment
period. This is an open loop fueling period. This .state is
present until the
WB02
heater comes up to its operation
temperature.
3. WB CL Start Comp is the beginning of closed-loop
fueling for the post-startup. The closed loop control
targets a rich lambda set point. The lambda set point is a
function of engine coolant and this set point leans out as
a function of time.
4. WB Warmup is
enten:~d
only if the engine coolant
temperature is not above a certain threshold.
S.
WB CL No Fault Checks occurs when the lambda closed
loop control is trying to control the fuel delivery to
Stoich
(Lambda= 1.000)
but no checks for emissions
faults are performed.
6. WB Closed Loop is closed loop lambda control with a
target set point of Stoich and emissions faults checks
occurs.
1.
WB Open Loop state occurs if an emission malfunction
is detected. The closed loop lambda control is disabled.
WB 02 Heater Status
There are three states for the Heater Status. Low
Temperature, High Temperature, and Normal Temperature.
The Normal Temperature is at 893m V.
WB 02 Crossing Stoich
There are three states for Crossing Stoich. Initialize indicates
the initialization period for the sensor. Rich indicates a
Lambda lower than 1.000. Lean indicates a Lambda higher
than 1.000.
Running Closed Loop PI Control
Indicator will be
RED
when running Open Loop and will
tum GREEN when running closed loop.
WB 02 Heater Voltage
This indicator reads the Wideband Heater status in
milli-volts. The set point for this function is 893mV.
Engines & GefJerators
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