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:

Disassembly
1. INSPECT PACK CLEARANCE OF REVERSE CLUTCH HINT: (See page AX-249) 2. INSPECT PACK CLEARANCE OF DIRECT CLUTCH AND OVERDRIVE CLUTCH HINT: (See page AX-249) 3. REMOVE DIRECT MULTIPLE DISC CLUTCH DISC (a) Using a screwdriver, remove the snap ring from the intermediate shaft. (b) Remo ...

Disassembly
1. Remove park/neutral position switch assembly (A) remove the nut, washer and control shaft lever. (B) using a screwdriver, unstake the nut stopper, and remove the lock nut and nut stopper. (c) Remove the 2 bolts and pull out the park/neutral position switch. 2. REMOVE BREATHER PLUG H ...

Changing shift ranges in S mode
To enter S mode, shift the shift lever to S. Shift ranges can be selected by operating the shift lever, allowing you to drive in the shift range of your choosing. The shift range can be selected by the shift lever. Upshifting Downshifting The selected shift range, from 1 to 6, will b ...

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