GUARD AS 6E4761 - Caterpillar

The Electronic Control Module (ECM) detects the following conditions:
The signal from the secondary speed/timing sensor is lost and/or intermittent.
The signal from the secondary speed/timing sensor was lost for at least 2 seconds while the signal from the primary speed/timing sensor remained valid and the engine was running.
Diagnostic code 0168-01 is not active.
The engine has been running for more than 3 seconds.
No 0041 diagnostic codes are active.System Response:A warning will appear on the display on the control panel and the code will be logged.Possible Performance Effect:The performance will not be affected unless both speed signals are lost. The loss of the signals from both speed/timing sensors will cause the ECM to shut down the engine. The engine will not restart if the signal from the secondary speed/timing sensor is lost.Troubleshooting:Test Step 1. Perform the following diagnostic procedure: "Engine Speed/Timing Sensor Circuit - Test"Results:
OK - STOP