SEAL-O-RING 9S3888 - Caterpillar

PID 0064 FMI 11Conditions Which Generate This Code:The Engine Control Module (ECM) detects the following conditions:
The secondary engine speed/timing signal was lost and then returned within one second while the primary engine speed/timing signal remained valid.
The secondary engine speed/timing signal is lost and/or intermittent.
The secondary engine speed/timing signal is lost for more than 15 seconds while the engine is cranking.System Response:The ECM uses the primary engine speed/timing sensor to calculate the engine speed. The ECM will illuminate the check engine lamp after this code has been active for ten hours. The code is logged.Possible Performance Effect:The performance will not be affected unless both speed signals are lost. The loss of both timing sensor signals will cause the ECM to shut down the engine.Troubleshooting:Test Step 1. Perform the following diagnostic procedure: "Engine Speed/Timing Sensor Circuit - Test"Results:
OK - STOP