C7.1 Engines and Generator Sets Caterpillar

Aftertreatment Identification Module - Test

Usage:

C7.1 770

This procedure covers the following codes:

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Table 1
Diagnostic Trouble Codes for the Aftertreatment Identification Module
J1939 Code	CDL Code	Code Description (code descriptions may vary)	Comments
5576-2	3468-2	Aftertreatment #1 Identification : Erratic, Intermittent, or Incorrect	The Electronic Control Module (ECM) detects the following conditions: The installed Clean Emissions Module (CEM) is not a certified match with the engine. Diagnostic codes 5576-8 or 5576-14 are not active. There are no active 3509 diagnostic codes. The ECM has been powered for 2 seconds. “This fault is a violation of the emissions regulations, and may result in severe fines and/or legal action if not corrected immediately.” Do not operate the engine with the active fault. Engine power is derated.
5576-8	3468-8	Aftertreatment #1 Identification : Abnormal Frequency, Pulse Width, or Period	The ECM detects the following conditions: No signal is detected from the aftertreatment identification module. There are no active 3509 diagnostic codes. The ECM has been powered for 2 seconds. Do not continue to operate the engine with the active fault. Engine power is derated.
5576-14	3468-14	Aftertreatment #1 Identification Number Module: Special Instruction	The ECM detects the following conditions: The signal from the aftertreatment identification module is invalid. Diagnostic code 5576-8 is not active. The ECM has been powered for 2 seconds. Do not continue to operate the engine with the active fault. Engine power is derated.

The aftertreatment identification module communicates with the engine ECM to ensure that the correct Integrated Clean Emissions Module (IGCEM) is installed.

If the total operating hours of the engine are greater than 100, the aftertreatment identification module will cease to send the signal. The diagnostic codes that are listed in Table 1 will be disabled.

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Illustration 1	g06142837
Schematic for the aftertreatment identification module

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Illustration 2	g02174636
View of the pin locations on the 31-pin connector and the 40-pin connector for the aftertreatment identification module

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Illustration 3	g02013237
View of the pin locations on the P2 connector for the aftertreatment identification module (18) Aftertreatment identification module signal (36) Aftertreatment identification module return (45) CEM 5 VDC supply

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Illustration 4	g02084579
Typical example of the connector for the aftertreatment identification module (1) 5 VDC Supply (3) Signal (6) Ground

Complete the procedure in the order in which the steps are listed.

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Table 2
Troubleshooting Test Steps	Values	Results
1. Check for Diagnostic Codes A. Establish communication between the electronic service tool and the Dosing Control Unit (DCU) . Refer to Troubleshooting, "Electronic Service Tools", if necessary. B. Turn the keyswitch to the ON position. C. Look for "-2", "-8", or "-14" active or logged codes.	Diagnostic code	Result: A 5576-2 (3468-2) or 5576-14 (3468-14) diagnostic code is active. Proceed to Test Step 9. Result: A 5576-8 (3468-8) diagnostic code is active. Proceed to Test Step 2.
2. Inspect Electrical Connectors and Wiring A. Inspect the P2/J2 connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details. B. Inspect the 31-pin connector and the 40-pin connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details. C. Inspect the connector for the aftertreatment identification module. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details. D. 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. E. Check the screw for the ECM connector for the correct torque of 6 N·m (53 lb in). F. Check the harness for abrasion and pinch points from the aftertreatment identification module back to the ECM.	Connectors and wiring	Result: There is a fault with the harness or the connectors. Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all the seals are correctly in place and ensure that the connectors are correctly connected. Use the electronic service tool to clear all logged diagnostic codes and then verify that the repair has eliminated the fault. Result: 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.
3. Measure the Voltage to the Aftertreatment Identification Module A. Turn the keyswitch to the OFF position. B. Disconnect the aftertreatment identification module from the harness. C. Turn the keyswitch to the ON position. D. Measure the voltage at the harness connector for the aftertreatment identification module from terminal 1 to terminal 6.	4.84 to 5.16 VDC.	Result: The supply voltage is out of the nominal range. Proceed to Test Step 4. Result: The supply voltage is correct. Proceed to Test Step 6.
4. Measure the Voltage to the 40-Pin Connector A. Turn the keyswitch to the OFF position. B. Disconnect the 40-pin connector. C. Turn the keyswitch to the ON position. D. Measure the voltage at the 40-pin connector on the harness between the engine and the CEM from pin 1 to pin 28.	4.84 to 5.16 VDC	Result: The voltage is within the expected range. The fault is in the harness. Repair: Repair the faulty wiring or replace the faulty wiring. Use the electronic service tool to verify that the repair eliminates the fault. Result: The voltage is out of the expected range. Reconnect the 40-pin connector. Proceed to Test Step 5.
5. Measure the Voltage to the 31-Pin Connector A. Turn the keyswitch to the OFF position. B. Disconnect the 31-pin connector. C. Turn the keyswitch to the ON position. D. Measure the voltage at the 31-pin connector on the engine harness from pin 1 to pin 28.	4.84 to 5.16 VDC	Result: The voltage is within the expected range. The fault is in the harness between the 31-pin connector and the 40-pin connector. Repair: Repair the faulty wiring or replace the faulty wiring. Use the electronic service tool to verify that the repair eliminates the fault. Result: The voltage is out of the expected range. The fault is in the engine harness. Repair: Repair the faulty wiring or replace the faulty wiring. Use the electronic service tool to verify that the repair eliminates the fault.
6. Check the Signal Wire on the CEM Harness A. Turn the keyswitch to the OFF position. B. Disconnect the connector for the aftertreatment ID module. Disconnect the 40-pin connector. C. Check the resistance between pin 27 on the 40-pin connector and terminal 3 on the harness connector for the aftertreatment identification module.	Greater than 2.0 Ohms	Result: The measured resistance is more than 2.0 Ohms. There is an open circuit in the CEM harness. Repair: Locate the open circuit in the harness. Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all the seals are correctly in place and ensure that the connectors are correctly coupled. Use the electronic service tool to verify that the repair eliminates the fault. Result: The measured resistance is less than 2.0 Ohms. The CEM harness is OK. Proceed to Test Step 7.
7. Check the Signal Wire Between the 40-Pin Connector and the 31-Pin Connector A. Turn the keyswitch to the OFF position. B. Disconnect the 40-pin connector. Disconnect the 31-pin connector. C. Check the resistance between pin 27 on the 40-pin connector and pin 27 on the 31-pin connector.	Greater than 2.0 Ohms	Result: The measured resistance is more than 2.0 Ohms. There is an open circuit in the harness between the 40-pin connector and the 31-pin connector. Repair: Locate the open circuit in the harness. Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all the seals are correctly in place and ensure that the connectors are correctly coupled. Use the electronic service tool to verify that the repair eliminates the fault. Result: The measured resistance is less than 2.0 Ohms. The harness between the 40-pin connector and the 31-pin connector is OK. Proceed to Test Step 8.
8. Check the Signal Wire Between the 31-Pin Connector and the ECM A. Turn the keyswitch to the OFF position. B. Disconnect the 31-pin connector. Disconnect the P2 connector. C. Check the resistance between pin 27 on the 31-pin connector and P2:18.	Greater than 2.0 Ohms	Result: The measured resistance is more than 2.0 Ohms. There is an open circuit in the engine harness. Repair: Locate the open circuit in the harness. Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all the seals are correctly in place and ensure that the connectors are correctly coupled. Use the electronic service tool to verify that the repair eliminates the fault. Result: The measured resistance is less than 2.0 Ohms. The engine harness is OK. Proceed to Test Step 9.
9. Manually Enter the "Aftertreatment Identification Information" A. Record the "CEM serial number" and the "configuration group" from the CEM Identification Plate. The identification plate is on the end cover of the CEM. B. Contact the Dealer Solutions Network (DSN) for a list of approved RF and CEM configurations for the engine. C. Verify that the CEM is a certified match with the engine. D. Establish communication between the electronic service tool and the ECM . If necessary, refer to Troubleshooting, "Electronic Service Tools". E. Navigate to the "Aftertreatment Configuration" page. F. Program the "Factory Installed Aftertreatment #1 Identification Number" with the serial number from the CEM Identification Plate. G. Program the "DPF #1 Soot Loading Sensing System Configuration Code" with the "configuration group" from the CEM Identification Plate. Note: The code is automatically cleared.	Manual programming	Result: The CEM is not a certified match to the engine. Repair: Replace the CEM with a certified match to the engine. Refer to Disassembly and Assembly for removal and installation procedures. When the new CEM is installed, the aftertreatment identification module will begin communicating with the ECM and the diagnostic code will be cleared. Note: The engine ECM will only communicate with the CEM if the total operating hours of the engine are less than 100. If the hours are greater than 100, the CEM information must be programmed into the ECM by using the electronic service tool. Result: The CEM is a certified match to the engine. Contact the Dealer Solutions Network (DSN).