SCREW-TRUSS HEAD 3193522 - Caterpillar

Which Generate This Code:The Electronic Control Module (ECM) detects one of the following conditions:
The signal wire for the primary engine speed/timing sensor is disconnected.
The signal wire for the primary engine speed/timing sensor is shorted to the +Battery.System Response:The ECM will log the diagnostic code. The diagnostic code may be viewed on a display module or on the Caterpillar Electronic Technician (Cat ET). If a valid signal is not received from the primary engine speed/timing sensor, the ECM will default to the secondary engine speed/timing sensor.
Engine misfires
Engine shutdownNote: The engine will shut down only if the primary engine speed/timing sensor and the secondary engine speed/timing sensor fail.Test Step 1. Perform the following diagnostic procedure: Engine Speed/Timing Sensor Circuit - TestResults:
OK - STOP