PLUG- 3569752 - Caterpillar

The aftertreatment identification module sends a digital signal to the engine ECM in order to ensure that the correct CEM is installed to the engine.If the total operating hours exceed 25, the aftertreatment identification module will cease to send the signal and the associated diagnostic codes are disabled.
Illustration 1 g02730795
Schematic for the aftertreatment identification module
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Pin locations on the P1 connector for the aftertreatment identification module (2) 5 VDC supply (3) Return (14) The signal for the aftertreatment identification module
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Connector for the aftertreatment identification module (1) 5 VDC Supply (3) Signal (6) GroundTest Step 1. Check for Diagnostic Trouble Codes
Establish communication between the electronic service tool and the ECM.
Download the Product Summary Report from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.Results:
A 3468-2 diagnostic code is active. - Proceed to Test Step 5.
A 3468-8 diagnostic code is active - Proceed to Test Step 2.
A 3468-14 diagnostic code is active - Proceed to Test Step 5.Test Step 2. Inspect Electrical Connectors and Wiring
Inspect the connector for the aftertreatment identification module. Refer 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 aftertreatment identification module.
Check the screw for the ECM connector for the correct torque of 6 N m (53 lb in).
Check the harness for abrasion and pinch points from the aftertreatment identification module back to the ECM.Results:
All connectors, pins, and sockets are correctly coupled and/or inserted. The harness is free of corrosion, abrasion, and pinch points - Proceed to Test Step 3.
There is a fault with the harness and connectors - Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are correctly coupled.Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair has eliminated the fault.STOPTest Step 3. Measure the Supply Voltage to the Aftertreatment Identification Module
Turn the keyswitch to the OFF position.
Disconnect the aftertreatment identification module from the harness.
Turn the keyswitch to the ON position.
Measure the voltage at the plug for the aftertreatment identification module from the terminal for the 5 VDC Supply to the return terminal.Results:
The voltage from the terminal for the 5 VDC supply to the return terminal measures 4.84 to 5.16 VDC - The supply voltage is correct. Proceed to Test Step 4.
The supply voltage is out of the nominal range. - The fault is in the 5 VDC supply wire or the return wire between the aftertreatment identification module and the ECM.Repair: Repair the faulty harness or replace the faulty harness.Use the electronic service tool to clear all logged diagnostic codes and verify that the repair has eliminated the fault.STOPTest Step 4. Check the Wiring for the Aftertreatment Identification Module
Turn the keyswitch to the OFF position.
Remove the P1 connector from the ECM.
Inspect the P1 connector. Refer to Troubleshooting, "Electrical Connectors - Inspect"