SPRING 4M5923 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the data link if a problem is suspected with the data link or if one of the diagnostic codes in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table
CDL Code and Description Conditions which Generate this Code System Response
247-9
SAE J1939 Data Link:Abnormal Update Rate The SCR system ECM has lost communication with the engine ECM on the global CAN data link. The code is logged.
2348-9
SAE J1939 Data Link #2:Abnormal Update Rate The SCR system ECM has lost all communication on the local CAN data link The code is logged.
3002-6
Engine Exhaust NOx Level Sensor:Current Above Normal The ECM detects a short in the power supply circuit for the sensor.
Troubleshoot this code before the 3216-9 The code is logged.
3002-9
Engine Exhaust NOx Level Sensor:Abnormal Update Rate The SCR system ECM has lost communication with the sensor on the local CAN data link The code is logged.
3609-6
Aftertreatment #1 Outlet #1 NOx Level Sensor:Current Above Normal The ECM detects a short in the power supply circuit for the sensor.
Troubleshoot this code before the 3216-9 The code is logged.
3609-9
Aftertreatment #1 Outlet #1 NOx Level Sensor:Abnormal Update Rate The SCR system ECM has lost communication with the sensor on the local CAN data link The code is logged.
3610-6
Aftertreatment #1 Outlet #2 NOx Level Sensor:Current Above Normal The ECM detects a short in the power supply circuit for the sensor.
Troubleshoot this code before the 3216-9 The code is logged.
3610-9
Aftertreatment #1 Outlet #2 NOx Level Sensor:Abnormal Update Rate The SCR system ECM has lost communication with the sensor on the local CAN data link The code is logged. This procedure verifies the integrity of the global CAN data link between the SCR system ECM and the engine ECM.This procedure verifies the integrity of the local CAN data link between the SCR system ECM and the following components:
Intake #1 NOx Sensor
Outlet #1 NOx Sensor
Outlet #2 NOx SensorIf Caterpillar Electronic Technician (ET) will not communicate with the ECM, refer to Troubleshooting, "Electronic Service Tool Does Not Communicate" before you begin this procedure. The procedure verifies that electrical power is being supplied to the engine ECM and to the service tool connector.The data links provide a communication link between the various control modules on the application.Cat ET may display the following error message:"The version of the ECM is not recognized and the integrity of the changed parameters and displayed data is not guaranteed."If this message is displayed, the flash file in the ECM may be newer than the version of Cat ET, or the latest version of Cat ET has not been installed. You must correct this condition prior to continuing with this procedure.Test Step 1. Inspect the Electrical Connectors and the Wiring
Turn the main disconnect switch to the OFF position.
Thoroughly inspect the ECM connector J1/P1 and J2/P2. Inspect all of the connectors to other modules on the data links. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 1 g02721158
P2 ECM connector
(P2-11) CAN data link −
(P2-12) CAN data