Circuit Description
The Class 2 serial data line allows all the modules on the line to transmit information to each other as needed. Each module is assigned an ID and all the information sent out on the line is assigned a priority by which it is received. When the ignition switch is turned to the ON position each module begins to send and receive information. Each module on the Class 2 serial data line knows what information it needs to send out and what information it should be receiving. What the modules do not know is which module is supposed to send them the information. This information is only learned after the module has received the information it needs along with the ID of the module that sent the information. This information is then remembered until the ignition switch is turned off. If the EBTCM looses communication with the Powertrain Control Module (PCM) then DTC U1016 will be set by the EBTCM.
Conditions for Setting the DTC
The DTC can be set any time the ignition is in the ON position, and the PCM does not communicate with the EBTCM for 5 seconds.
Action Taken When the DTC Sets
ABS remains enabled, TCS/ Active Handling™ (if equipped with RPO JL4) are disabled.
| • | Indicators that turn on: |
| Car Icon (TCS indicator |
| • | Messages displayed on the DIC: |
| Service Traction System |
| Service Active HNDLG (if equipped with RPO JL4) |
Conditions for Clearing the DTC
| • | Condition for DTC is no longer present and scan tool clear DTC function is used. |
| • | Fifty ignition cycles have passed with no DTCs detected. |
Diagnostic Aids
| • | It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction. |
| • | An intermittent malfunction is most likely caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation. |
| • | If an intermittent malfunction exists refer to Testing for Electrical Intermittents in Wiring Systems. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | Go to Diagnostic System Check | |
2 | Using a scan tool read the IPC DTC(s). Is DTC U1016 also set as a current IPC DTC? | -- | Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls | |
3 | Is DTC U1016 set as a current DTC? | -- | Go to Diagnostic System Check | |
4 | Replace the EBTCM. Refer to Electronic Brake Control Module Replacement . Is the replacement complete? | -- | Go to Diagnostic System Check | -- |
