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

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:

Reassembly
1. INSTALL HEATER RADIATOR UNIT SUB-ASSEMBLY (a) Install the heater radiator unit sub-assembly to the air conditioning blower assembly. (b) Install the 2 O-rings to the heater water valve assembly. (c) Install the 3 screws and the heater water valve assembly. (d) Install the 2 s ...

Removal
1. REMOVE ENGINE AND TRANSAXLE HINT: (See page EM-26) 2. REMOVE AUTOMATIC TRANSMISSION WITH TRANSFER HINT: (See page AX-164) 3. REMOVE NO. 1 TRANSFER CASE PLUG (a) Remove the No. 1 transfer case plug. (b) Remove the No. 1 gasket from the transfer case No. 1 plug. 4. REMOVE NO. 2 T ...

Air Mix Damper Control Servo Motor Circuit (Driver Side)
DESCRIPTION The air mix control servo motor (air mix damper servo sub-assembly) is controlled by the A/C amplifier. The air mix control servo motor moves the air mix damper by rotating (normal, reverse) with electrical power from the A/C amplifier. This adjusts the mix ratio of the air t ...

В© 2011-2024 Copyright www.tsienna.net