Marine Power 4.3 VORTEC MPI Owner's Manual page 35

11.
Engine Diagnostics and Codes
Name Description
Inter Cooler Replay ECM detects abnormal relay current or voltage.
Injector ECM sets code if injector fails diagnostic test.
Manifold Absolute Pressure ECM sets code if sensor fails diagnostic test.
Manifold Air Temperature Sensor ECM sets code if sensor fails diagnostic test.
Manifold Air Temperature Warning Sensor alerts ECM if inlet air temperature is too high.
Malfunction Indicator Lamp Driver ECM sets code if driver fails diagnostic test.
Main Health Coprocessor ECM problem.
Misfire ECM detects cylinder misfire.
Oil Pressure Sensor ECM sets code if sensor fails diagnostic test.
Oil Pressure Warning Sensor alerts ECM if oil pressure is too high or low.
Oil Temperature Sensor ECM sets code if sensor fails diagnostic test.
Oil Temperature Warning Sensor alerts ECM if engine oil temperature is above 300° F.
Oxy Fuel Trim ECM sets code after detecting abnormally rich or lean condition.
Oxy Heater ECM sets code after detecting failure in O2 sensor heaters.
Oxy Voltage ECM sets code after detecting abnormal voltage at O2 sensors.
Oxy Response ECM sets code after determining O2 sensor response is slow.
Powertrain Relay ECM detects abnormal relay contact voltage.
Supercharger Inlet Pressure Sensor Supercharger inlet pressure too high or too low.
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Trouble MIL Buzzer Reduce Comments
Code Lamp RPM
66030 X
651-658 X
106 X
105 X
105 X X
66003 X
65580-82 X
65591-99 X
100 X
100 X X
175 X
175 X X
65565-66 X
66019-22 X
65561-64 X
65567-68 X
66013-66014 X
3563 X
Only applicable on supercharged engines. Driver controls
intercooler pump relay.
Last digit corresponds to injector number. Typically shorted
wire or injector shorted out.
Not all engines are equipped with this sensor.
On supercharged engines check intercooler system. Reduces
RPM to 2500.
Boat may not be equipped with MIL light.
Check the memory power, the main power and the ground on
ECM. May need replacement.
Last digit corresponds to cylinder number. 99 is random cylinder misfire.
Reduces RPM to 2500.
Reduces RPM to 2500. Not used on 5.7 Engines.
65 indicates odd bank, 66 even bank.
19 = pre-o2 odd bank, 20 = pre-o2 even bank, 21 = post-o2 odd
bank, 22 = post-o2 even bank.
61 = pre-o2 odd bank, 62 = post-o2 odd bank, 63 = pre-o2 even
bank, 64 = post-o2 even bank.
67 indicates odd bank, 68 even bank.
Only applicable on supercharged engines.
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