Toyota Sienna Service Manual: Communication Error from ECM to VSC
DTC P1631 Communication Error from ECM to VSC
DTC U0100 Lost Communication with ECM/PCM "A"
DESCRIPTION
The ECM sends signals such as A/T information signals, dynamic laser cruise control operation signals, brake operation demand signals, and buzzer operation demand signals to the skid control ECU when the dynamic laser cruise control is in operation. The ECM is the only component that has a function to record and output the DTCs in the dynamic laser cruise control system. Therefore, if the skid control ECU detects a communication error from the ECM, it sends a malfunction signal back to the ECM.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|
P1631 |
While the dynamic laser cruise control is either preparing for operation or operating, if the ECM continuously receives a logical error signal from the skid control ECU for a certain amount of time, the ECM records this logical error code |
|
|
U0100 |
While the dynamic laser cruise control is either preparing for operation or operating, if the ECM continuously receives a communication cut off signal from the ABS & traction actuator (skid control ECU) for a certain amount of time, the ECM records this communication cut off code |
|
INSPECTION PROCEDURE
HINT: This circuit uses CAN communication. Therefore, if there are any malfunctions in the communication circuit, one or more DTCs in the CAN communication system are output.
1 CHECK CAN COMMUNICATION SYSTEM
Refer to HOW TO PROCEED WITH TROUBLESHOOTING
END
Communication Error from VSC to ECM
DTC P1630 Communication Error from VSC to ECM
DTC U0122 Lost Communication with Vehicle Dynamics
Control Module
DESCRIPTION
The skid control ECU sends signals such as cruise control cancel demand ...
Communication Error of Yaw Rate Sensor
DTC U0123 Communication Error of Yaw Rate Sensor
DESCRIPTION
This circuit detects the yaw rate of the vehicle and transmits its signal to
the skid control ECU and
distance control ECU.
...
Other materials:
A Remote Control System does not Operate
INSPECTION PROCEDURE
1 CHECK SYSTEM
Check that the remote control operation of the rear
system is not locked by the radio receiver or the radio
and navigation assembly.
Check if "Rear System Locked" appears on the
television display assembly.
OK:
The message ...
Transmitter battery
REPLACEMENT
1. REMOVE TRANSMITTER BATTERY
NOTICE:
Special caution should be taken for handling each
component as they are precision electronic
components.
Using a coin or the equivalent, pry out the
transmitter case.
NOTICE:
Do not forcibly pry out the case.
Re ...
Engine Immobiliser System Malfunction
DTC B2799 Engine Immobiliser System Malfunction
DESCRIPTION
This DTC is output when the ECM detects errors in communication between the
transponder key ECU
and the ECM, or in the communication lines. This DTC is also output when an
engine start is attempted
while the ECU communication ID bet ...
