U2100

TEST DESCRIPTION

Diagnostic Chart:

The Controller Area Network (CAN) is a high speed system for sharing data. The circuit consists of a two wire twisted pair connecting the ECM to the TCM, a second twisted pair connecting the TCM to the EBTCM, and a third pair connecting the EBTCM and BCM. The CAN circuits are monitored continuously by the modules on the circuit. The only requirement is that the modules are in an On power mode. This DTC will set if module has attempted to establish communications on the CAN circuits more than 7 times.

Besides storing the DTC as both current and history, the modules on the CAN network each take separate actions as listed:
^ Engine Control Module (ECM)
- Turn On the MIL during the second consecutive drive cycle with the error detected.
- Record the operating conditions at the time of turning on the MIL and store the data as freeze frame information.
^ Electronic Brake Traction Control Module (EBTCM)
- Traction Control System (TCS) is disabled.
- The TCS LED in the TCS switch is turned Off.

The MIL is cleared, turned Off, and the DTC cleared by a different strategy for each module:
^ Engine Control Module (ECM)
- If the fault is not detected for three consecutive drive cycles, the current DTC is cleared and the MIL is turned Off.
- The history DTC is cleared if the malfunction does not reoccur for 40 consecutive drive cycles.
- The history DTC is cleared if there is a battery disconnect.
^ Electronic Brake Traction Control Module (EBTCM)
- If the fault is not detected for one drive cycle the current DTC is cleared and the TCS LED is illuminated on the next key cycle.
- The history DTC is cleared if the malfunction does not reoccur for 100 consecutive drive cycles.