Ngine D Iagnostics And C Odes - Marine Power 4.3 VORTEC MPI Owner's Manual

11.
Engine Diagnostics and Codes
Name Description
Speed Sensor ECM sets code if speed sensor fails diagnostic test.
SVS Lamp ECM detects issue with SVS circuit.
System Voltage ECM sets code if system voltage is below 10 or above 16.
Throttle Position Sensor ECM detects dual sensors out of range.
Throttle Position Sensor ECM detects dual sensors do not agree.
5V Buffer ECM detects out of range voltage on low voltage output pins.
34
Trouble MIL Buzzer Reduce Comments
Code Lamp RPM
84 X
66004 X
627 X
65601-02 X X
65610-13 X X
65620-23 X
Not normally used in jet or repower applications. Used in
Towboat applications.
This circuit controls the warning buzzer alarm.
Check alternator connections and for tight belt. May need
replacement.
Reduces RPM to 1000. Check throttle body connector.
Reduces RPM to 1000. Check throttle body connector.
Used to supply voltage to engine sensors. It is a 5 volt reference.
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