PINION 1186582 - Caterpillar

Note: Turn the keyswitch to the OFF position before connecting or disconnecting these components.If the 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 ECM and to the service tool connector.The data links are used to communicate information between the engine ECM and other control modules that are a part of the application. Cat ET also communicates with the ECM via the data links.The service tool connector contains connections for electrical power and for the data links.When the keyswitch is in the OFF position, Cat ET may communicate with the ECM. However, the communications may be disrupted and the communications may require frequent reconnection. In order to avoid this problem, place the keyswitch in the ON position when Cat ET is being used.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."This message indicates that one of the following conditions exist:
The flash file in the ECM is newer than the version of Cat ET.
The latest version of Cat ET has not been installed.
Illustration 1 g06156053Note: The DEF Quality Sensor is only available on 2017models or later.
Table 2
Troubleshooting Test Steps Values Results
1. Check the Connectors
A. Turn the keyswitch to ON.
B. Connect to the "Engine #1 Aftertreatment Controller" using Cat ET.
C. Record all active and logged codes.
D. Turn the keyswitch to OFF.
E. Allow the system to completely power down before disconnecting connectors.
F. Thoroughly inspect the connectors that are associated with the data link circuits. Verify that the connectors are free of debris, free of corrosion and securely connected.
Connectors
Result: The connectors were connected properly and did not have corrosion or moisture.
If a -11 code is active or logged, Proceed