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