Toyota RAV4 manuals

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
  • Communication circuit
  •  ECM
  •  ABS & traction actuator (Skid control ECU)

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
  • Communication circuit
  •  ECM
  •  ABS & traction actuator (Skid control ECU)

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

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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 ...

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