Engine Management Module
Throttle Position Sensor
The throttle position sensor (TPS) receives voltage signals from the EMM. As the throttle lever is adjusted, the EMM interprets the return voltage signal and adjusts accordingly. A damaged sensor or intermittent signal can trigger service codes and affect engine performance.
Crankshaft Position Sensor
Ribs on the flywheel mark crankshaft position. As these ribs pass the magnetic field of the Crankshaft Position Sensor (CPS), an AC voltage signal is generated. The EMM utilizes this signal for various functions including identifying crankshaft position, controlling fuel and ignition timing, and generating tachometer readings.
If the TPS circuit voltage is outside the normal range, the EMM triggers service codes and may limit engine RPM to idle. Corrective action should be taken to resolve faults and reset the system.
Neutral Switch
The neutral switch, mounted on the powerhead, provides a ground signal to the EMM indicating shift linkage position. This allows the EMM to adjust idle speed and provide start-in-gear protection. Faulty operation of this switch can trigger service codes and affect engine performance.
Regular monitoring of TPS, CPS, and neutral switch operation is essential for maintaining optimal performance and diagnosing potential issues in Evinrude E-TEC outboards.
For more detailed information, refer to the official documentation provided by Evinrude
