Toyota Sienna Service Manual: Communication Error from ECM to VSC

Toyota Sienna Service Manual / Cruise control / Dynamic laser cruise control system / Diagnostic trouble code chart / 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:

Installation
1. INSTALL STEERING COLUMN ASSEMBLY (a) Install the steering column assembly with the 3 bolts. Torque: 25 N*m (255 kgf*cm, 18 ft.*lbf) (b) Connect the connectors. (c) Connect the wire harness clamps to the steering column tube. 2. CONNECT STEERING INTERMEDIATE SHAFT ASSEMBLY (a) ...

Camshaft Position "B" - Timing Over
HINT: If DTC P0014, P0015, P0024 or P0025 is present, check the VVT (Variable Valve Timing) system. DESCRIPTION Refer to DTC P0013 (See page ES-87). MONITOR DESCRIPTION DTC P0014 and P0024 The ECM compares current valve timing with target valve timing, while the engine is running a ...

Removal
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 2. REMOVE FRONT DOOR SCUFF PLATE LH 3. REMOVE COWL SIDE TRIM SUB-ASSEMBLY LH 4. REMOVE LOWER INSTRUMENT PANEL FINISH PANEL SUB-ASSEMBLY LH (See page IP-6) 5. REMOVE TIRE PRESSURE WARNING RESET SWITCH (a) Disengage the 2 claws and remove t ...