COVER-SIDE 3182390 - Caterpillar

present. If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - The 1785-10 diagnostic code is logged at this time. The analog supply is not reaching the sensor. Proceed to Test Step 3.
Not OK - A 262-3, 262-4, 269-3 or 269-4 diagnostic code is active at this time. There is a problem with the sensor supply for the analog sensors. Proceed to Test Step 4.
Not OK - A 41-3 or 41-4 diagnostic code is active at this time. There is a problem with the sensor supply for the digital sensors. Proceed to Test Step 6.Test Step 3. Check the Supply Voltage at the Sensor Connector
Disconnect the harness connectors for the intake manifold pressure sensor.
Restore the electrical power to the ECM.Note: Be sure to wiggle the harness during the following measurements in order to reveal an intermittent condition.
Measure the voltage between terminals A and B at the connector.
Remove the electrical power from the ECM.
Connect all of the sensors.Expected Result:The voltage measurement is 5.0 0.2 VDC.Results:
OK - The voltage measurement is 5.0 0.2 VDC.Repair: The analog supply is reaching the sensor connector. There may be a problem with the sensor. Perform the following procedure:
Clear all diagnostic codes.
Run the engine. Allow the engine to warm-up. Check if the code has been logged again.If the code becomes active or logged, the sensor is faulty. Replace the sensor. Verify that the repair eliminates the original problem.If the code does not become active or logged, there may be an intermittent problem in the harness or in a connector. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct troubleshooting procedure.STOP
Not OK - The voltage measurement is not 5.0 0.2 VDC. There is a problem with the harness wiring or with the ECM. Proceed to Test Step 5.Test Step 4. Disconnect the 5 Volt Sensor(s) while you Monitor the Active Diagnostic Codes
Use this procedure for any 262 diagnostic codes.
Monitor the active diagnostic code screen on Cat ET while you disconnect each 5 Volt sensor at the sensor connector. Check for an active 262-3 code or an active 262-4 code.Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Disconnect the following sensors one at a time:
Atmospheric pressure sensor
Engine oil pressure sensor
Fuel pressure sensor
Injection actuation pressure sensor
Intake manifold pressure sensor
Use this procedure for any 269 diagnostic codes.
Monitor the active diagnostic code screen on Cat ET while you disconnect each 5 Volt sensor at the sensor connector. Check for an active 269-3 code or an active 269-4 code.Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Disconnect the turbocharger inlet pressure sensor.
Remove electrical power from the ECM.Expected Result:The diagnostic code deactivates when a particular sensor is disconnected.Results:
OK - The diagnostic code deactivates when a particular sensor is disconnected.Repair: Connect the suspect sensor. If the code returns, replace the sensor. Connect the connector(s). Verify that the problem is resolved.STOP
Not OK - The diagnostic code remains active