STARTER AS-RSV 5066383 - Caterpillar

Accugrade10 Volts DC supply is faulty or the Accugrade 10 Volts DC supply has failed.
There is an open circuit between the Accugrade 10 Volts DC supply and the sensor.
The signal circuit for the sensor is shorted to ground.
The sensor has failed.
The ECM has failed. This is unlikely. Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 1957 FMI 04 is active before performing this procedure. Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:A level 1 warning is generated. The diagnostic code of CID 1957 FMI 04 will be logged in the internal memory of the ECM.Note: Make sure that the Accugrade 10 Volts DC signal from the machine ECM is present and correct. Use the 146-4080 Digital Multimeter to check the signal at contact J1-69 (wire 799-WH) and J1-70 (wire J766-PU) at the J1machine harness connector for the machine ECM. DO NOT PROCEED FURTHER UNTIL THE OUTPUT FROM THE 10 VOLTS DC POWER SUPPLY IS CORRECT.Test Step 1. INSPECT THE SENSOR.
Perform a visual inspection of the sensor, the wiring for the sensor and the hardware that is associated