Toyota Tacoma (2015-2018) Service Manual: Communication Error from VSC to ECM Invalid Serial Data Received (P163081)

Toyota Tacoma (2015-2018) Service Manual / Cruise Control / Dynamic Radar Cruise Control System(for 2gr-fks) / Communication Error from VSC to ECM Invalid Serial Data Received (P163081)

DESCRIPTION

The skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 sends signals such as cruise control cancel signals and brake demand response signals to the ECM when the dynamic radar cruise control system is operating.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL
P163081	Communication Error from VSC to ECM Invalid Serial Data Received	While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, communication data from the skid control ECU (master cylinder solenoid)1 or skid control ECU (brake actuator assembly)2 is logically inconsistent for approximately 0.5 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: Click here

w/ Smart Key System: Click here

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

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.
Drive the vehicle at 36 km/h (22 mph) or more for 1 second or more.

Click here

Result	Proceed to
DTC P163081 is not output	A
DTC P163081 is output	B

USE SIMULATION METHOD TO CHECK

REPLACE ECM

Cruise Control Input Processor (P160700)

DESCRIPTION The ECM continuously monitors its main and sub CPUs. This self-check ensures that the ECM is functioning properly. If outputs from the CPUs are different and deviate from the standard ...

Brake Switch "A" Signal Compare Failure (P057162)

DESCRIPTION When the brake pedal is depressed, the stop light switch assembly sends a signal to the ECM. When the ECM receives this signal, it cancels the dynamic radar cruise control. The fail-s ...

Other materials:

Operation History List
OPERATION HISTORY LIST NOTICE: The cause of a malfunction is stored in the RAM or EEPROM in the certification ECU (smart key ECU assembly). As the cause of a malfunction stored in the RAM will be cleared when the cable is disconnected from the negative (-) battery terminal, do ...

Lost Communication with ECM (C1437)
DESCRIPTION The skid control ECU (master cylinder solenoid) receives signals from the ECM via the CAN communication system. DTC Code DTC Detection Condition Trouble Area C1437 When the IG1 terminal voltage is 10 V or higher and the veh ...

Front Occupant Classification Sensor LH Circuit Malfunction (B1780)
DESCRIPTION The occupant classification sensor front LH circuit consists of the occupant detection ECU and the occupant classification sensor front LH. DTC B1780 is set when a malfunction is detected in the occupant classification sensor front LH circuit. DTC No. DTC Det ...