GASKET 1167068 - Caterpillar

System Operation Description:Use this procedure to troubleshoot any suspect problems with the following sensors:
Primary engine speed/timing sensor
Secondary engine speed/timing sensorThis procedure covers the following diagnostic codes:
320-02 Speed/Timing Sensor Loss of Signal
320-11 Speed/Timing Sensor mechanical failure
342-02 Loss of Secondary Engine Speed signal
342-11 Secondary Engine Speed Sensor mechanical failureThe engine uses two engine speed/timing sensors:Primary engine speed/timing sensor - The primary engine speed/timing sensor detects the reference for engine speed and timing from a timing ring with a notched pattern that has been machined onto a portion of the crankshaft gear.Secondary engine speed/timing sensor - The secondary engine speed/timing sensor detects the reference for engine speed and timing from a timing ring with a notched pattern that has been machined onto a portion of the camshaft gear.Each of the engine speed/timing sensors produces a signal as the respective timing ring rotates past the tip of the sensor. The Electronic Control Module (ECM) uses these signals to determine the engine speed and the engine timing.When the timing has been determined, the ECM triggers each injector in the correct firing order at the correct time. The actual timing and duration of each injection is based on engine rpm, load, and demand.