LAMP 9X4492 - Caterpillar

System Operation Description:Use this procedure if a 261-13 Engine Timing Calibration required is active.Also use this procedure if any of the following conditions exist:
The Electronic Control Module (ECM) has been replaced.
The front gear group has been serviced.
Either of the speed/timing sensors have been replaced.The ECM has the ability to calibrate the mechanical differences between the Top Center (TC) of the No. 1 piston and the orientation of the camshaft. A magnetic transducer can be installed into the flywheel housing that will signal the orientation of the flywheel to the ECM. This signal identifies the TC of the No. 1 piston. The ECM also uses the signal that is detected from the speed/timing sensor. This signal identifies the actual orientation of the camshaft.The signal from the transducer is generated as the flywheel's timing pin hole rotates past the tip of the transducer. The signal from the engine speed/timing sensor is generated by a timing reference ring that is on the back side of the fuel injection pump drive gear.The two signals are used to calculate a timing offset that is stored in the ECM memory. This timing offset is applied to fuel injection timing for the engine.Note: A timing calibration will not increase the available engine power.Table 1 lists the special tools that are required