Sofiware Diagnostics (Chart) - Westerbeke 6.5 MCG Service Manual

SOFTWARE DIAGNOSTICS
ENGINE WARNINGS IDLE STATE:
DC circuit breaker on, generator not running.
In the IDLE state, only Ambient Air Temperature Low and MAP Sensor Possible Fault are logged. If the fault persists after the
generator is started, the CRANK state and RUN state warnings and shutdowns will apply. There are NO shutdowns in the IDLE
state, only warnings. Shutdowns can occur in both CRANK and RUN states.
WARNING/DESCRIPTION PROBLEM PROBABLE CAUSE
Coolant Temperature Shorted Short circuit (0 Ohms) 1. Faulty temperature sensor.
2. Pinched or bare wire in harness.
Coolant Temperature Open Open circuit 1. Faulty ECT sensor.
2. Sensor unplugged.
3. Loose connection or corroded wiring.
Coolant Temperature Low Reading less than -25°C ( -13° F) 1. Excessively cold weather.
2. Faulty temperature sensor.
Coolant Temperature High
Reading rnore than 95°C (203° F) 1. Faulty temperature sensor.
2. High compartment temperature.
3. Engine heat soak after norrnal shutdown.
External Alarm Open circuit 1. External alarm fault (i.e. Fireboy)
2. Loose connection or corroded wiring.
Exhaust Temperature High Open circuit 1. Faulty exhaust temperature switch.
2. Low coolant flow to exhaust.
3. Loose connection or corroded wiring.
Battery Voltage Low Less than 12 volts 1. Weak or dead battery.
2. Blown fuse in charging circuit.
3. Faulty regulator or charging circuit.
4. Loose connection or corroded wiring.
Battery Voltage High
More than 15 volts
1. Faulty regulator or charging circuit.
Ambient Air Temperature Shorted
Short circuit (0 Ohms)
1. Faulty temperature sensor.
2. Sensor unplugged.
3. Pinched or bare wire in harness.
Ambient Air Temperature Opened Open circuit 1. Faulty air temperature sensor.
2. Loose connection or corroded wiring.
Ambient Air Temperature Low
Reading more than -25°C ( -13° F) 1. Excessively cold ambient temperature.
2. Faulty air tern perature sensor/connection.
Ambient Air Temperature High Reading more than 63°C (145° F) 1. Excessively hot ambient temperature
2. Bilge venting system faulty or inadequate.
3. Engine heat soak after normal shutdown.
4. Faulty temperature sensor.
Oil Pressure Send or Shorted Short circuit (0 ohms) 1. Faulty oil pressure sender.
2. Pinched or shorted wire in harness.
MAP Sensor Possible Fault MAP reading out of range 1. Faulty MAP sensor.
(<10 kPa or >115 kPa) 2. Pinched or shorted wire in harness.
3. Loose connection or corroded wiring.
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