Engine Operation 40 UENR0623-02 Event Codes Event Codes are used to indicate that the ECM has detected an abnormal engine operating condition. The ECM will log the occurrence of the event code. This does not indicate an electrical malfunction or an electronic malfunction. If the temperature of the coolant in the engine is higher than the permitted limit, then the ECM will detect the condition. The ECM will then log an event code for the condition. Speed/Timing Sensors Illustration 35 g02722355 Typical example The camshaft speed/timing sensor generates a signal that is related to the camshaft position.
The camshaft speed/timing sensor detects the movement of the position wheel on the front of the camshaft (2). The signal that is generated by the speed/timing sensor is transmitted to the ECM. The ECM calculates the speed and the rotational position of the engine by using the signal. Illustration 34 g02722354 Typical example The crankshaft speed/timing sensor generates a signal by detecting the movement of the teeth that are on the crankshaft timing ring (1). The signal that is generated by the speed/timing sensor is transmitted to the ECM. The ECM uses the signal from the speed/timing sensor to calculate the position of the crankshaft. The signal is also used to determine the engine speed.
Illustration 36 g02259713 Schematic for speed/timing sensor