ROD-EYE 4440093 - Caterpillar

The connections are OK at the connectors. There does not appear to be an intermittent problem in the circuit at this time. Return the engine to service.STOP
Not OK - The voltage reading varied more than 0.5 volts during the test or the signal was not present or stable during the test.Repair: Disconnect the suspect connector and inspect the connector and the terminals for moisture, damage, and corrosion. Repair the connectors and/or the terminals. Return the engine to service.STOPTest Step 3. Check the Supply Voltage at the Sensor Connector
Disconnect the harness connector for the suspect sensor.
Measure the voltage between terminal A (sensor supply) and terminal B (analog return) at the harness connector for the suspect sensor.Expected Result:The voltage is between 4.5 VDC and 5.5 VDC.Results:
OK - The voltage is between 4.5 VDC and 5.5 VDC. The supply voltage is reaching the sensor connector. If you are troubleshooting a -3 diagnostic code, proceed to Test Step 4. If you are troubleshooting a -4 diagnostic code, proceed to Test Step 7.
Not OK - The voltage is less than 4.5 VDC or the voltage is greater than 5.5 VDC.Repair: The supply voltage at the sensor connector is incorrect. There appears to be a problem in the wiring harness or in a connector. There may be a problem with the power supply at the ECM. Perform the following procedure:
Disconnect the J1/P1 ECM connector.
Fabricate two jumper wires that are long enough to be used to create test circuits at the ECM connector. Crimp connector sockets to one end of each of the jumper wires.
Remove the wires from terminal locations P1-2 (sensor supply) and P1-3 (analog return). Install a jumper wire into each of these terminal locations.
Connect the J1/P1 ECM connector.
Switch the 16 amp circuit breaker for the ECM ON. Turn the engine control switch to the STOP position.
Measure the voltage between the jumper wire in P1-2 (sensor supply) and P1-3 (analog return).
Turn the engine control switch to the OFF/RESET position. Switch the 16 amp circuit breaker for the ECM OFF.
Restore the wiring to the original configuration.If the supply voltage between the jumper wires at the ECM is between 4.5 VDC and 5.5 VDC, the ECM is OK. There is a problem in the harness or in a connector. Repair the wiring harness. Verify that the repair resolved the original problem.If the supply voltage at the ECM is not between 4.5 VDC and 5.5 VDC, there is a problem with the ECM. Temporarily install a new ECM. Refer to Troubleshooting, "ECM - Replace". If the problem is resolved with the new ECM, install the original ECM and verify that the problem returns. If the new ECM operates correctly and the original ECM does not operate correctly, replace the original ECM. Verify that the repair resolved the original problem.STOPTest Step 4. Check for Battery Voltage on the Signal WireMeasure the voltage between terminals C (sensor signal) and B (analog return) on the harness connector for the suspect sensor.Expected Result:The voltage measurement is less than the +Battery