According to the detected DTC(s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the electric brake booster.
DTC Description
DTC
Freeze Frame
U0100-00 CAN Communication Failure With ECM/PCM
U0122-00 CAN Communication Failure With VSA (CAN Ch1)
1.
DTC check:
DTC check
?1.
Turn the vehicle to the ON mode.
?2.
Clear the DTC with the HDS.
?3.
Turn the vehicle to the OFF (LOCK) mode, then wait 5 seconds or more.
NOTE: Do not open and close the driver's door.
?4.
Turn the vehicle to the ON mode.
?5.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
U0100-00 CAN Communication Failure With ECM/PCM
U0122-00 CAN Communication Failure With VSA (CAN Ch1)
Is DTC indicated?
YES
Go to step 2.
NO
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.?
2.
Open wire check (F-CAN_H, F-CAN_L lines):
Open wire check (F-CAN_H, F-CAN_L lines)
?1.
Turn the vehicle to the OFF (LOCK) mode with driver's door open.
?2.
Wait for 3 minutes.
NOTE: Do not close the driver's door.
?3.
Disconnect the following connector.
Electric brake booster 26P connector
?4.
Disconnect the following connectors according to the detected DTC.
DTC
Connector
U0100-00
PCM connector A (51P)
U0122-00
VSA modulator-control unit 46P connector
NOTE: Jump the SCS line with the HDS, and wait more than 1 minute when disconnecting the PCM connector.
?5.
Check for continuity between the receiving control unit and the transmitting control unit according to the detected DTC.
Test condition
Vehicle OFF (LOCK) mode
Electric brake booster 26P connector: disconnected
Transmitting control unit connector(s) for indicated DTCs: disconnected
The F-CAN_H and F-CAN_L wires are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. According to the detected DTC on the following table, replace the correspond control unit.?
