Toyota Tacoma (2015-2018) Service Manual: Vehicle Speed Tolerance Malfunction (C1AA2)

Toyota Tacoma (2015-2018) Service Manual / Cruise Control / Lane Departure Alert System / Vehicle Speed Tolerance Malfunction (C1AA2)

DESCRIPTION

The forward recognition camera receives vehicle speed tolerance signals from the combination meter assembly. If the combination meter assembly detects a vehicle speed tolerance malfunction signal, it informs the forward recognition camera via CAN communication, and DTC C1AA2 is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1AA2	Vehicle Speed Tolerance Malfunction	When the vehicle is being driven at a speed of 5 km/h (3 mph) or more 3 seconds after the ignition switch is turned to ON, a signal from the combination meter assembly indicating an abnormal vehicle speed tolerance is detected by the forward recognition camera for 50 seconds or more.	Meter/gauge system Combination meter assembly Forward recognition camera

CAUTION / NOTICE / HINT

NOTICE:

When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera learning.
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
When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

PROCEDURE

1.	CHECK FOR DTCs (METER / GAUGE SYSTEM)

HINT:

Lane departure alert system DTC C1AA2 may be stored due to a malfunction in the meter/gauge system. Therefore it is necessary to check for and troubleshoot meter/gauge system DTCs first.

(a) Check for DTCs.

Body Electrical > Combination Meter > Trouble Codes

Result	Proceed to
Meter/gauge system DTCs are not output	A
Meter/gauge system DTCs are output	B

CHECK METER / GAUGE SYSTEM

2.	CHECK DTC OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Chassis / LKA/LDA / Trouble Codes.

(e) Clear the DTCs.

Click here (f) Make sure that the DTC detection conditions are met.

(f) Make sure that the DTC detection conditions are met.

HINT:

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

(g) Check for DTCs.

Click here

Result	Proceed to
DTC C1AA2 is output	A
DTC C1AA2 is not output	B

USE SIMULATION METHOD TO CHECK

3.	REPLACE FORWARD RECOGNITION CAMERA

(a) Replace the forward recognition camera.

Click here (b) Adjust the forward recognition camera.

(b) Adjust the forward recognition camera.

Click here

4.	CHECK DTC OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Chassis / LKA/LDA / Trouble Codes.

(e) Clear the DTCs.

Click here (f) Make sure that the DTC detection conditions are met.

(f) Make sure that the DTC detection conditions are met.

HINT:

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

(g) Check for DTCs.

Click here

Result	Proceed to
DTC C1AA2 is output	A
DTC C1AA2 is not output	B

REPLACE COMBINATION METER ASSEMBLY

END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)

FCM Destination Information Unmatched (C1AA1)

DESCRIPTION When the forward recognition camera is replaced with a new one, the new forward recognition camera attempts to store country specification information received from the main body ECU ...

Steering Pad Switch Circuit

DESCRIPTION The forward recognition camera receives a lane departure alert switch signal from the steering pad switch assembly. WIRING DIAGRAM for 2TR-FE for 2GR-FKS CAUTION / NOTICE / HINT ...

Other materials:

ACC Signal Circuit
DESCRIPTION This circuit detects whether the ignition switch is ACC or off, and sends this information to the main body ECU (multiplex network body ECU). WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the fo ...

Installation
INSTALLATION PROCEDURE 1. INSTALL REAR BUMPER ASSEMBLY (a) Using an engine lifter or equivalent, engage the 2 pins to install the rear bumper assembly. Text in Illustration *a Pin - - NOTICE: Using plate lift attachments or equiv ...

How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: Use the following procedure to troubleshoot the LIN communication system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT ...