Dtc P1631 Communication Error From Ecm To Vsc

Engine Hybrid System. Land Cruiser. Urj200, 202 Grj200 Vdj200
Cruise Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

CHECK FOR DTCs (RADAR CRUISE1)

REPLACE ECM

CHECK FOR DTCs (RADAR CRUISE1)

DTC P1631 Communication Error from ECM to VSC


DESCRIPTION

The ECM sends signals such as A/T information signals, dynamic radar cruise control operation signals and brake operation demand signals to the skid control ECU (master cylinder solenoid) when the dynamic radar cruise control is operating. The ECM is the only component that has a function to store and output DTCs in the dynamic radar cruise control system. Therefore, if the skid control ECU (master cylinder solenoid) 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 vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, the ECM continuously receives a logical error signal from the skid control ECU (master cylinder solenoid) for 1 second or more.
  1. CAN communication system
  2. ECM
  3. Skid control ECU (master cylinder solenoid)

INSPECTION PROCEDURE

1.CHECK CAN COMMUNICATION SYSTEM

  1. Using the GTS, check that the CAN communication system is functioning normally.

    OK:
    CAN communication system is functioning normally.
    HINT:
    Refer to CAN Bus Check for the CAN communication system.
    1. for LHD: Click here
    2. for RHD: Click here
    Result:
    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C


B
GO TO CAN COMMUNICATION SYSTEM (Click here)

C
GO TO CAN COMMUNICATION SYSTEM (Click here)
A


2.CHECK FOR DTCs (RADAR CRUISE1)

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG).

  1. Clear the DTCs (Click here).

  1. Make sure that the DTC detection conditions are met.

    HINT:
    If the detection conditions are not met, the system cannot detect the malfunction.
    1. Turn the engine switch on (IG).
    2. Turn the dynamic radar cruise control system on using the cruise control main switch (ON/OFF).
    3. Drive the vehicle at 5 km/h (3 mph) or more for 0.5 seconds or more.

  1. Enter the following menus: Powertrain / Radar Cruise1 / Trouble Codes.

  1. Check for DTCs (Click here).

    Result:
    Result
    		Proceed to
    DTC P1631 is not output
    		A
    DTC P1631 is output
    		B


B
Go to step 3
A

USE SIMULATION METHOD TO CHECK (Click here)

3.REPLACE ECM

  1. Replace the ECM.

    1. for 1UR-FE: Click here
    2. for 3UR-FE: Click here
    3. for 1VD-FTV: Click here

NEXT


4.CHECK FOR DTCs (RADAR CRUISE1)

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG).

  1. Clear the DTCs (Click here).

  1. Make sure that the DTC detection conditions are met.

    HINT:
    If the detection conditions are not met, the system cannot detect the malfunction.
    1. Turn the engine switch on (IG).
    2. Turn the dynamic radar cruise control system on using the cruise control main switch (ON/OFF).
    3. Drive the vehicle at 5 km/h (3 mph) or more for 0.5 seconds or more.

  1. Enter the following menus: Powertrain / Radar Cruise1 / Trouble Codes.

  1. Check for DTCs (Click here).

    Result:
    Result
    		Proceed to
    DTC P1631 is not output
    		A
    DTC P1631 is output (for LHD)
    		B
    DTC P1631 is output (for RHD)
    		C


B
REPLACE MASTER CYLINDER SOLENOID (Click here)

C
REPLACE MASTER CYLINDER SOLENOID (Click here)
A

END