Toyota Tundra Service Manual: Radar Cruise Control Presence Determination Malfunction (Engine / HV) (C1A52)

Toyota Tundra Service Manual / Engine, Hybrid System / Cruise Control / Dynamic Radar Cruise Control System / 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

PROCEDURE

1.

CHECK FOR DTC (RADAR CRUISE 2)

(a) Clear the DTCs.

Click here

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

HINT:

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

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

(c) Check for DTCs.

Click here

Result

Proceed to

DTC C1A52 is not output

A

DTC C1A52 is output

B
A

USE SIMULATION METHOD TO CHECK

B

2.

REPLACE ECM

(a) Replace the ECM.

for 1UR-FE: Click here

for 3UR-FE: Click here

for 3UR-FBE: Click here

NEXT

3.

CHECK FOR DTC (RADAR CRUISE 2)

(a) Clear the DTCs.

Click here

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

HINT:

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

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

(c) Check for DTCs.

Click here

Result

Proceed to

DTC C1A52 is not output

A

DTC C1A52 is output

B
A

END (ECM WAS DEFECTIVE)
B

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

    Front Radar Sensor Incorrect Axial Gap (C1A11,C1A14)

    Cruise Control Switch Circuit

    See More:

    Toyota Tundra Service Manual > Steering Pad: Installation
    INSTALLATION PROCEDURE 1. INSTALL STEERING PAD (a) Check that the ignition switch is off. (b) Check that the cable is disconnected from the negative (-) battery terminal. CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2026 Copyright www.ttundra.com
    0.0105