Toyota Tacoma (2015-2018) Service Manual: 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. |
|
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
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- 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.
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.
(c) Check for DTCs.
Click here
|
Result |
Proceed to |
|---|---|
|
DTC C1A52 is not output |
A |
|
DTC C1A52 is output |
B |
| A | .gif) |
USE SIMULATION METHOD TO CHECK |
|
.gif)
|
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.
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.
(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)
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:
Diagnosis System
DIAGNOSIS SYSTEM
CHECK DLC3
(a) Check the DLC3.
Click here
FUNCTION OF WARNING INDICATOR AND MESSAGE
(a) If the lane departure alert system is not functioning properly, the driver
is warned by the lane departure alert indicator and multi-information display warning
message on the combinat ...
Receiver Error (C2176/76)
DESCRIPTION
Tire pressure warning valve and transmitter signals are transmitted to the tire
pressure warning ECU and receiver in the vehicle as radio waves.
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
Note
C2 ...
Diagnosis System
DIAGNOSIS SYSTEM
1. DESCRIPTION
(a) When troubleshooting OBD II (On-Board Diagnostics) vehicles, an OBD II scan
tool (complying with SAE J1978) must be connected to the DLC3 (Data Link Connector
3) of the vehicle. Various data in the vehicle ECM (Engine Control Module) can be
then read.
(b) ...
