Diagnostic Instructions
DTC Descriptor
DTC U2142 00: Lost Communication With Yaw Rate Sensor (YRS)
Circuit/System Description
Modules connected to the CAN bus serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages
are needed to be exchanged on the serial data circuits. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. Each message contains the identification number of the
transmitter module.
The electronic brake control module (EBCM) activates the other modules connected to the CAN serial data circuits by applying voltage when the ignition key is in ACC, ON or START. The EBCM, Yaw Rate Sensor, and the Steering Angle Sensor are the only modules
connected to the CAN bus serial data circuits. For more information on CAN bus serial data refer to
Data Link Communications Description and Operation
.
Conditions for Running the DTC
| • | The system voltage is between 9-16 volts. |
| • | The vehicle power mode master requires serial data communication to occur. |
Conditions for Setting the DTC
A supervised periodic message that includes the transmitter module availability has not been received.
Action Taken When the DTC Sets
| • | The vehicle stability enhancement system (VSES), if equipped, and traction control system (TCS) will not function. |
| • | System OFF lamps will illuminate for these systems. |
Conditions for Clearing the DTC
| • | A current DTC clears when the malfunction is no longer present. |
| • | A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction. |
Reference Information
Schematic Reference
Connector End View Reference
Master Electrical Component List
Electrical Information Reference
Circuit/System Testing
- Ignition OFF, disconnect the harness connector of the yaw rate sensor.
- Ignition ON, verify that a test lamp illuminates between the module voltage circuit and ground.
| ⇒ | If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM. |
- Ignition OFF, test for less than 5 ohms of resistance between the module ground circuits and ground.
| ⇒ | If greater than 5 ohm, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the EBCM. |
- If all circuits test normal, replace the yaw rate sensor.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
