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:
Selecting the audio
source
Switching between audio sources such as radio and CD are
explained in this section.
Changing audio source
Press the “AUDIO” button to display the audio source selection
screen.
If the audio source selection screen is not displayed, press the “AUDIO”
button again.
Select the des ...
Disassembly
1. REMOVE STOP LIGHT SWITCH ASSEMBLY
(a) Turn the stop light switch assembly
counterclockwise and remove the stop light switch
assembly.
(b) Remove the stop light switch mounting adjuster
from the brake pedal support sub-assembly.
2. REMOVE STOP LIGHT SWITCH CUSHION
(a) Remove the stop ligh ...
Removal
1. REMOVE ROOF HEADLINING ASSEMBLY
2. REMOVE SLIDING ROOF SIDE GARNISH LH
Disengage the 3 claws.
Disengage the rear clip.
Disengage the front clip.
Remove the slide garnish by pulling it rearward.
3. REMOVE SLIDING ROOF SIDE GARNISH RH
HINT:
Use the same procedures described abov ...