Engine Speed Sensor - No Signal
The ECM is not receiving a signal from the engine crankshaft position sensor. Without this critical signal, the ECM cannot determine engine speed or crankshaft position, preventing proper fuel injection timing and ignition. The engine may crank but not start, or may stall unexpectedly during operation.
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Code 115 indicates the ECM isn't receiving engine speed information from the crankshaft sensor. Without knowing engine position, the ECM cannot fire fuel injectors at the correct time, preventing the engine from starting.
Use a multimeter to check resistance across the sensor terminals - it should read between 200-900 ohms. Also verify the air gap between sensor and flywheel teeth is 0.5-1.5mm using a feeler gauge.
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