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:
Removal
1. REMOVE FRONT DOOR WINDOW FRAME MOULDING
Remove the screw.
Using a heat light, heat the front door window frame
moulding between 40 to 60 C (104 to 140 F).
NOTICE:
Do not heat the front door window frame
moulding excessively.
Slide the front door window frame moulding upward
...
Removal
1. REMOVE OUTSIDE MOULDING
Put protective tape around the outside moulding.
Using a heat light, heat the moulding between 40 to
60 C (104 to 140 F).
NOTICE:
Do not heat the moulding excessively.
Tie both piano wire ends to a wooden block or a
similar object.
Cut off the tape by ...
Disposal
1. DISPOSE OF SHOCK ABSORBER ASSEMBLY FRONT LH
HINT:
Dispose the RH side by the same procedures as the LH
side.
(a) Fully extend the shock absorber rod.
(b) Using a drill, make a hole in the cylinder as shown in
the illustration to discharge the gas inside.
CAUTION:
When dril ...