SHELL AS 4234324 - Caterpillar

System Operation Description:Use this procedure to troubleshoot diagnostic codes for open circuits or for short circuits for the sensors of these parameters:
Inlet air temperature
Engine oil temperature
Unfiltered engine oil pressure
Filtered engine oil pressure
Engine coolant temperatureNote: The engine coolant temperature sensor does not require +5 VDC from the master Electronic Control Module (ECM). The engine coolant temperature sensor is a passive sensor of the analog type. The sensor operates without a voltage supply from the master ECM.A -03 code is probably caused by a problem in an engine harness. There may be an open circuit in a harness, or a short circuit to a positive voltage source in a harness. The next likely cause is a sensor problem. The least likely cause is a problem with the master ECM.A -04 code is probably caused by a short circuit to ground in an engine harness. The next likely cause is a sensor problem. The least likely cause is a problem with the master ECM.Logged diagnostic codes provide a historical record. Before you begin this procedure, use the Caterpillar Electronic Technician (ET) to print the logged codes to a file.This troubleshooting procedure may generate additional diagnostic codes. Keep your mind on correcting the cause of the original diagnostic code. Clear the diagnostic code after the problem is resolved.
Illustration 1 g01090704
Schematic for the analog sensorsTest Step 1. Inspect the Electrical Connectors and Wiring
Set the engine control to the OFF/RESET mode. Remove the electrical power from the engine.Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Illustration 2 g01085914
Terminal box for the master ECM (1) J1/P1 connectors for the master ECM (2) J7/P7 connectors for the wiring to the analog sensors
Thoroughly inspect the following connectors:
J1/P1 connectors
J7/P7 connectors on the terminal box
Check the torque of the allen head screw for the ECM connector. The proper torque is 6 1 N m (55 9 lb in).
Illustration 3 g01085928
Harness side of the P1 connector (P1-14) Signal for the inlet manifold air temperature (P1-17) Signal for the engine oil temperature (P1-24) Signal for the filtered engine oil pressure (P1-26) Signal for the unfiltered engine oil pressure (P1-27) Signal for the engine coolant temperature
Illustration 4 g01085923
Harness side of the P7 connector (P7-C) Signal for the engine coolant temperature (P7-F) Signal for the inlet manifold air temperature (P7-G) Signal for the filtered engine oil pressure (P7-J) Signal for the engine oil temperature (P7-U) Signal for the unfiltered engine oil pressure
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the analog sensors.
Illustration 5 g01085933
Right side view (3) Inlet air temperature sensor (4) Engine coolant temperature sensor
Illustration 6 g01085943
Left side view (5) Unfiltered oil pressure sensor (6) Filtered oil pressure sensor (7) Oil temperature sensor
Check the harness and wiring for abrasion and for pinch points from each analog sensor to the master ECM.Expected Result:All connectors, pins, and sockets are connected properly. The