VALVE GP-BANK 6E1780 - Caterpillar

Illustration 2 g00905658
+5 V supply circuitTest Step 1. Inspect Electrical Connectors And Wiring.
Illustration 3 g00765223
Terminal locations for harness connector P2
Illustration 4 g00838739
Terminal locations for harness connector P1
Thoroughly inspect the following connections:
J2/P2 ECM Engine Harness Connector
J200/P200 Turbocharger Outlet Pressure Sensor
J201/P201 Engine Oil Pressure Sensor
J203/P203 Atmospheric Pressure Sensor
J204/P204 Injection Actuation Pressure Sensor
J208/P208 Fuel Pressure Sensor
J220/P220 Turbocharger Inlet Pressure SensorRefer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the +5 V sensor supply:
P2:2 Engine Pressure Sensor +5 V (G828-WH)
P2:3 Engine Pressure Sensor Common (G829-GN)Refer to Illustration 3.
Check the ECM connector (allen head screw) for the proper torque of 6.0 N m (55 lb in).
Check the harness and wiring for abrasion and pinch points from the sensors back to the ECM.Expected Result:All connectors, pins and sockets should be completely coupled and/or inserted and the harness and wiring should be free of corrosion, abrasion or pinch points.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Connect the Caterpillar Electronic Technician (Cat ET) and Check for Active Diagnostic Codes.
Connect the Cat ET to the service tool connector.
Turn the keyswitch to the ON position while the engine is OFF.
Monitor the active diagnostic code screen of Cat ET. Check and record any active diagnostic codes.Note: Wait at least 15 seconds in order for the diagnostic codes to become active.Expected Result:Select the condition of the following codes:
CID 262-FMI 03 5 Volt Sensor DC Power Supply short to +batt
CID 262-FMI 04 5 Volt Sensor DC Power Supply short to groundResults:
Active - Proceed to Test Step 3.
Logged ONLY - Proceed to Test Step 5.
Not Active or Logged - The +5 V supply is operating correctly at this time.STOPTest Step 3. Disconnect The ECM Engine Harness Connector From The ECM.
Connect Cat ET to the service tool connector.
Turn the keyswitch to the OFF position while the engine is OFF.
Disconnect ECM engine harness connector J2/P2.
Turn the keyswitch to the ON position while the engine is OFF.
Access the active diagnostic code screen on Cat ET. Check for one of the following active diagnostic codes:
CID 262-FMI 03 5 Volt Sensor DC Power Supply short to +batt
CID 262-FMI 04 5 Volt Sensor DC Power Supply short to groundNote: When ECM engine harness connector J2/P2 is disconnected and the keyswitch is in the ON position, open circuit diagnostic codes will be "Active" or "Logged" for all of the engine sensors. This is normal.Expected Result:The +5 V diagnostic code is active when the ECM engine harness connector is disconnected.Results:
Yes - The +5 V diagnostic code is active when the ECM engine harness connector is disconnected.Repair: Temporarily connect a test ECM to ECM machine harness connector J1/P1. Recheck for a +5 V diagnostic code. If a +5 V diagnostic code is not active,