Marine Power 4.3 VORTEC MPI User Manual

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11. Engine Diagnostics and Codes
Name Description Trouble MIL Buzzer Reduce Comments
Code Lamp RPM
Speed Sensor ECM sets code if speed sensor fails diagnostic test. 84 X Not normally used in jet or repower applications. Used in
Towboat applications.
SVS Lamp ECM detects issue with SVS circuit. 66004 X This circuit controls the warning buzzer alarm.
System Voltage ECM sets code if system voltage is below 10 or above 16. 627 X Check alternator connections and for tight belt. May need
replacement.
Throttle Position Sensor ECM detects dual sensors out of range. 65601-02 X X Reduces RPM to 1000. Check throttle body connector.
Throttle Position Sensor ECM detects dual sensors do not agree. 65610-13 X X Reduces RPM to 1000. Check throttle body connector.
5V Buffer ECM detects out of range voltage on low voltage output pins. 65620-23 X Used to supply voltage to engine sensors. It is a 5 volt reference.

Marine Power 4.3 VORTEC MPI Specifications

General

Brand	Marine Power
Model	4.3 VORTEC MPI
Category	Engine
Language	English