240SX L4-2389cc 2.4L SOHC MFI (KA24E) (1989)
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Crankshaft Position Sensor: Diagnostic Trouble Code Tests and Associated Procedures
The ECU sensed that the 1° or 180° signal was not received for the first few seconds during starting or was erratic during engine operation.
Code 11 - Crank Angle Sensor