STICK & BEARING AS 1985657 - Caterpillar

If one of the above codes is active, identify the type of diagnostic according to the condition: the diagnostic code is either "open/short to +batt" FMI 03 or "short to ground" (FMI 04).Expected Result:None of the above codes are active.Results:
No active codes - None of the above codes are active.Repair: If any of the above codes are logged and the engine is not running properly, refer to Troubleshooting, "Troubleshooting Without a Diagnostic Code".If the engine is running properly at this time, there may be an intermittent problem in the harness that is causing the codes to be logged. Refer to Troubleshooting, "Inspecting Electrical Connectors".STOP
Active open/short to +batt (FMI 03) - There is an active open/short to +batt diagnostic code. Proceed to Test Step 5.
Active short to ground (FMI 04) - There is an active short to ground diagnostic code. Proceed to Test Step 4.Test Step 4. Disconnect the Suspect Sensor
Turn the keyswitch to the OFF position.
Disconnect the sensor that has the "short to ground" diagnostic code.
Turn the keyswitch to the ON position. Wait at least 30 seconds for activation of the diagnostic codes.
Look for an active open/short to +batt diagnostic code for the disconnected sensor.Expected Result:There is an active open/short to +batt diagnostic code for the disconnected sensor.Results:
Yes - Before the suspect sensor was disconnected, there was an active short to ground diagnostic code for the sensor. After the suspect sensor was disconnected, there was an active open/short to +batt diagnostic code for the sensor.Repair: Reconnect the sensor. If the active short to ground diagnostic code recurs, replace the sensor.Verify that the code does not activate when the new sensor is installed. Clear the logged diagnostic code from the ECM.STOP
No - Before the suspect sensor was disconnected, there was an active short to ground diagnostic code for the sensor. After the suspect sensor was disconnected, the active short to ground diagnostic code remained. Proceed to Test Step 5.Test Step 5. Check the Supply Voltage at the Sensor Connector
Verify that the suspect sensor is disconnected from the engine harness.
At the harness connector for the suspect sensor, measure the voltage between terminals A (Engine Pressure Sensor +5V) and B (Engine Pressure Sensor Common).Expected Result:The supply voltage is 5.0 0.16 VDC.Results:
OK - The voltage between terminals A and B is 5.0 0.16 VDC. The 5 volt supply is present at the sensor connector. Proceed to Test Step 6.
Not OK - The voltage between terminals A and terminal B is not 5.0 0.16 VDC. The 5 volt supply is not present at the sensor connector. The 5 volts must be present at the sensor in order to continue this procedure.Repair: Verify that the wiring and/or connectors are OK. Repair any faulty wiring and/or connectors, when possible. Replace parts, if necessary. Refer to Troubleshooting, "Inspecting Electrical Connectors". Check for diagnostic codes again.STOPTest Step 6. Check the Pull-Up Voltage at the Sensor Connector
At the harness connector for the suspect sensor, measure the voltage between terminals B (Engine Pressure Sensor Common) and