Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Communication Error from ECM to VSC (P1631)

DESCRIPTION

The ECM sends signals such as A/T information signals, dynamic radar cruise control operation signals, brake operation demand signals, and buzzer operation demand signals to the skid control ECU (brake actuator assembly) when the dynamic radar cruise control is operating. Therefore, if the skid control ECU (brake actuator assembly) detects a communication error with the ECM, it sends a malfunction signal back to the ECM.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

P1631

Communication Error from ECM to VSC

While the vehicle speed is 36 km/h (22 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 (brake actuator assembly) for approximately 1 second or more.

  • CAN communication circuit
  • ECM
  • Skid control ECU (brake actuator assembly)

CAUTION / NOTICE / HINT

NOTICE:

  • Before replacing the ECM, refer to Registration.

    w/o Smart Key System: Click here w/ Smart Key System: Click here

    w/ Smart Key System: Click here

  • First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting.

    Click here

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Using the Techstream, check if the CAN communication system is functioning normally.

Click here

Result

Proceed to

CAN communication system DTCs are not output

OK

CAN communication system DTCs are output

NG

NG

GO TO CAN COMMUNICATION SYSTEM

OK

2.

CHECK FOR DTCs (RADAR CRUISE1)

(a) Clear the DTCs.

Click here (b) Perform the following to make sure that the DTC detection conditions are

(b) Perform the following to make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the malfunction cannot be detected.

  1. Turn the ignition switch to ON.
  2. Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF button).
  3. Drive the vehicle at 36 km/h (22 mph) or more for 1 second or more.

(c) Check for DTCs.

Click here

Result

Proceed to

DTC P1631 is not output

A

DTC P1631 is output

B

A

USE SIMULATION METHOD TO CHECK

B

3.

REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

4.

CHECK FOR DTCs (RADAR CRUISE1)

(a) Clear the DTCs.

Click here (b) Perform the following to make sure that the DTC detection conditions are

(b) Perform the following to make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the malfunction cannot be detected.

  1. Turn the ignition switch to ON.
  2. Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF button).
  3. Drive the vehicle at 36 km/h (22 mph) or more for 1 second or more.

(c) Check for DTCs.

Click here

Result

Proceed to

DTC P1631 is not output

A

DTC P1631 is output

B

A

END

B

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

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Theft Deterrent System is not Unset when Engine is Running
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Diagnosis System
DIAGNOSIS SYSTEM DIAGNOSIS FUNCTION (a) The diagnosis function turns off the cruise control indicator, illuminates the master warning light and displays a warning message when a malfunction is detected. When a malfunction is detected in the dynamic radar cruise control system, DTCs are store ...

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