GASKET 1446076 - Caterpillar

System Operation Description:The Integrated Temperature Sensing Module (ITSM) monitors K type thermocouples at each cylinder exhaust port and at the inlets and outlets for both turbochargers. The ITSM can also calculate the average temperature for each cylinder bank (left and right). Temperature readings of the thermocouples are available over the CAT Data Link for use by each Electronic Control Module (ECM) and other modules. The temperatures can be viewed on the Caterpillar Electronic Technician (ET).The ITSM generates event codes for each of the following programmable conditions:
High exhaust temperature
High deviation of an exhaust port temperature
Low deviation of an exhaust port temperature
High inlet temperature to the turbocharger turbine
High outlet temperature from the turbocharger turbineA diagnostic code is generated by the ITSM for the circuit of any thermocouple that is shorted to the +battery side, shorted to ground, or open.Logged diagnostic codes provide a historical record. Before you begin this procedure, use Cat 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 codes after the problem is resolved.
Illustration 1 g00995205
Schematic for the circuit of the ITSMFor the actual wiring, refer to the schematic for the engine electrical system.Test Step 1. Inspect the Electrical Connectors and Wiring
Set the engine control to the OFF/RESET mode. Switch the 16 amp circuit breaker OFF.Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Illustration 2 g00995212
Terminal box for the master ECM (1) Ground strap (2) J1/P1 connectors for the master ECM (3) 16 amp circuit breaker (4) J5/P5 connectors for the ITSM
Thoroughly inspect each of the following connectors:
Master ECM J1/P1 connectors
J5/P5 connectors on the terminal box for the master ECM
Check the torque of the Allen head screw for the ECM connectors. The proper torque is 6 1 N m (53 9 lb in).
Illustration 3 g00995272
Harness side of the ECM P1 connector (P1-8) CAT data link + (P1-9) CAT data link −
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the ITSM.
Illustration 4 g00995277
Thermocouples (5) Thermocouple for the temperature of the cylinder exhaust port (6) Thermocouple for the temperature of the exhaust inlet to the turbocharger turbine (7) Thermocouple for the temperature of the turbocharger exhaust outlet
Carefully inspect the connectors for each of the thermocouples. Check the harnesses and wiring for abrasion and for pinch points from each thermocouple to the ITSM.
Illustration 5 g00995281
ITSM (8) ITSM (9) J18/P18 connectors for the harness to the terminal box for the master ECM (10) J40/P40 connectors for the harness to the thermocouples
Thoroughly inspect the J18/P18 connectors and the J40/P40 connectors for the ITSM. Check the harnesses and wiring for abrasion and for pinch points from the ITSM to the master ECM.Expected Result:All of the connectors, pins, and sockets are connected properly. The connectors and the wiring do not have corrosion, abrasion, or pinch points.Results: