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

Toyota Tacoma (2015-2018) Service Manual / Cruise Control / Dynamic Radar Cruise Control System(for 2tr-fe) / 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
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

GO TO CAN COMMUNICATION SYSTEM

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.

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

Click here

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

USE SIMULATION METHOD TO CHECK

3.	REPLACE ECM

(a) Replace the ECM.

Click here

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.

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

Click here

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

END

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

Brake System (P1578)

DESCRIPTION This DTC is stored when a malfunction is detected in the vehicle stability control system. Check the vehicle stability control system when DTC P1578 is stored. DTC No. ...

Vehicle Information Not Obtained (C1A02)

DESCRIPTION When a new millimeter wave radar sensor assembly is installed, it receives vehicle specification information (destination, steering wheel position, 2WD or 4WD, etc.) from the main bod ...

Other materials:

Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE PRESSURE RELIEF VALVE (a) Remove the pressure relief valve and O-ring. 2. REMOVE MAGNET CLUTCH ASSEMBLY (a) Secure the cooler compressor assembly in a vise between aluminum plates. (b) Using SST, hold the magnet clutch hub. SST: 09985-00260 (c) Remove the ...

Tires
Replace or rotate tires in accordance with maintenance schedules and treadwear. ■ Checking tire 1. New tread 2. Treadwear indicator 3. Worn tread The location of treadwear indicators is shown by the “TWI” or “ ” marks, etc., molded on the sidewall of each tire. Check spare ti ...

Theft Deterrent System Presence Detection (B279C,B279C95)
DESCRIPTION If an ECM that is incompatible with the engine immobiliser system is installed, the ECM stores this DTC. DTC No. DTC Detection Condition Trouble Area DTC Output Confirmation Operation B279C*1 An ECM that is incom ...