The controller area network (CAN) is a high speed system for sharing data. The
circuit consists of a 2 wire twisted pair connecting the engine control module (ECM)
to the transmission control module (TCM), and a second twisted pair connecting the
ECM to the body control module (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: ECM |
| - | Turn ON the malfunction indicator lamp (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. |
| • | The MIL is cleared, turned OFF, and the DTC cleared by a different strategy
for each module: ECM |
| - | If the fault is not detected for 3 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. |
INSERT GRAPHIC SMFLW95411AA
DTC U2100
