Toyota Tacoma (2015-2018) Service Manual: Communication Error from ECM to VSC Invalid Serial Data Received (P163181)

Toyota Tacoma (2015-2018) Service Manual / Cruise Control / Dynamic Radar Cruise Control System(for 2gr-fks) / Communication Error from ECM to VSC Invalid Serial Data Received (P163181)

DESCRIPTION

The ECM sends signals such as dynamic radar cruise control operation signals, brake operation demand signals and buzzer operation demand signals to the skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 when the dynamic radar cruise control is operating. Therefore, if the skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 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	MIL
P163181	Communication Error from ECM to VSC Invalid Serial Data Received	While the ignition switch is ON and the dynamic radar cruise control system is operating, the ECM continuously receives a logic error signal from the skid control ECU (master cylinder solenoid)1 or skid control ECU (brake actuator assembly)2 for approximately 1 second or more.	Vehicle stability control system ECM	Does not come on

*1: for Hydraulic Brake Booster
*2: for Vacuum Brake Booster

CAUTION / NOTICE / HINT

NOTICE:

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
Before replacing the ECM, refer to Registration.
w/o Smart Key System:

w/ Smart Key System:

PROCEDURE

1.	CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

(a) Check for DTCs.

for Hydraulic Brake Booster
Click here
for Vacuum Brake Booster
Click here

Result	Proceed to
DTCs are not output	A
DTCs are output (for Hydraulic Brake Booster)	B
DTCs are output (for Vacuum Brake Booster)	C

GO TO VEHICLE STABILITY CONTROL SYSTEM

2.	CHECK FOR DTCs (CRUISE CONTROL SYSTEM)

(a) Clear the DTCs.

Click here (b) Perform the following procedure.

(b) Perform the following procedure.

HINT:

If the following procedure is not performed, the previously output DTC cannot be detected.

Turn the ignition switch to ON.
Turn the dynamic radar cruise control system on using the cruise control main switch.
Wait for 1 second or more.

Click here

Result	Proceed to
DTC P163181 is not output	A
DTC P163181 is output	B

USE SIMULATION METHOD TO CHECK

REPLACE ECM

Vehicle Control History

VEHICLE CONTROL HISTORY VEHICLE CONTROL HISTORY HINT: A part of the control history can be confirmed using the vehicle control history. Click here ...

Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129)

DESCRIPTION The millimeter wave radar sensor assembly and ECM communicate with each sensor and ECU via CAN communication. If any malfunction is detected in a CAN communication circuit, one or more ...

Other materials:

TS and CG Terminal Circuit
DESCRIPTION In Test Mode (signal check), a malfunction in the speed sensor that cannot be detected when the vehicle is stopped can be detected while driving. Sensor check mode can be entered by connecting terminals TS and CG of the DLC3 and turning the ignition switch from off to ON. WIRING D ...

Screen Flicker or Color Distortion
PROCEDURE 1. CHECK DISPLAY SETTING (a) Reset display settings (contrast, brightness) and check that the screen appears normal. OK: The display returns to normal. OK END NG PROCEED TO NEXT SUSPECTED AREA SHOWN IN ...

Remote Control System does not Operate
DESCRIPTION The main body ECU (multiplex network body ECU) receives remote control signals from the driver door key cylinder or wireless transmitter. Then, the main body ECU (multiplex network body ECU) sends the remote control signals to the sliding roof ECU (sliding roof drive gear sub-asse ...