Toyota Tacoma (2015-2018) Service Manual: Radar Cruise Control Presence Determination Malfunction (Engine / HV) (C1A52)

Toyota Tacoma (2015-2018) Service Manual / Cruise Control / Dynamic Radar Cruise Control System(for 2tr-fe) / Radar Cruise Control Presence Determination Malfunction (Engine / HV) (C1A52)

DESCRIPTION

DTC C1A52 is stored when the ECM cannot recognize the millimeter wave radar sensor assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1A52	Radar Cruise Control Presence Determination Malfunction (Engine / HV)	Approximately 17 seconds after the ignition switch is turned to ON, the ECM cannot recognize the millimeter wave radar sensor assembly for approximately 1.3 seconds or more.	ECM Millimeter wave radar sensor assembly

CAUTION / NOTICE / HINT

NOTICE:

When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle. As a result, a DTC may be stored.
When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.
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 DTC (RADAR CRUISE 2)

(a) Clear the DTCs.

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

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

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

Turn the ignition switch to ON.
Wait for 20 seconds or more.

Click here

Result	Proceed to
DTC C1A52 is not output	A
DTC C1A52 is output	B

USE SIMULATION METHOD TO CHECK

2.	REPLACE ECM

(a) Replace the ECM.

Click here

3.	CHECK FOR DTC (RADAR CRUISE 2)

(a) Clear the DTCs.

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

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

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

Turn the ignition switch to ON.
Wait for 20 seconds or more.

Click here

Result	Proceed to
DTC C1A52 is not output	A
DTC C1A52 is output	B

END (ECM WAS DEFECTIVE)

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

Front Radar Sensor Incorrect Axial Gap (C1A11,C1A14)

DESCRIPTION When the system determines that the vehicle is driving straight ahead based on signals from the yaw rate and acceleration sensor (airbag sensor assembly), etc., the millimeter wave ra ...

Cruise Control Switch Circuit

DESCRIPTION The cruise control main switch is used to turn the dynamic radar cruise control system on and off, as well as operate 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), T ...

Other materials:

Brake System (P157800)
DESCRIPTION This DTC is stored when a malfunction is detected in the vehicle stability control system. DTC No. Detection Item DTC Detection Condition Trouble Area MIL P157800 Brake System While the igni ...

System Diagram
SYSTEM DIAGRAM 1. OVERALL CAN BUS DIAGRAM (a) The CAN communication system is composed of 4 buses. CAN Main Bus Line Terminating Resistor CAN Branch Line * Gateway Function Equipped ECU ...

Installation
INSTALLATION PROCEDURE 1. INSTALL WINDSHIELD WIPER SWITCH ASSEMBLY (a) Engage the claw to install the windshield wiper switch assembly. (b) Connect the 2 connectors. 2. INSTALL UPPER STEERING COLUMN COVER 3. INSTALL LOWER STEERING COLUMN COVER ...