Toyota CH-R Service Manual: Yaw Rate Sensor (C1A46)

Toyota CH-R Service Manual / Pre-collision / Pre-collision System / Yaw Rate Sensor (C1A46)

DESCRIPTION

The millimeter wave radar sensor assembly receives yaw rate and acceleration sensor (airbag sensor assembly) signals from the airbag sensor assembly and skid control ECU (brake actuator assembly) via CAN communication. If the millimeter wave radar sensor assembly receives yaw rate and acceleration sensor (airbag sensor assembly) malfunction signals from the airbag sensor assembly or skid control ECU (brake actuator assembly), DTC C1A46 is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1A46	Yaw Rate Sensor	Any of the following conditions is met: While the vehicle is being driven at a speed of 5 km/h (4 mph) or more, the millimeter wave radar sensor assembly receives yaw rate and acceleration sensor (airbag sensor assembly) malfunction signals from yaw rate and acceleration sensor (airbag sensor assembly) for approximately 10 seconds. While the vehicle is being driven at a speed of 5 km/h (4 mph) or more, the millimeter wave radar sensor assembly receives yaw rate and acceleration sensor (airbag sensor assembly) zero point malfunction signals from skid control ECU (brake actuator assembly) for approximately 1 second.	Vehicle stability control system Yaw rate and acceleration sensor (Airbag sensor assembly) Skid control ECU (Brake actuator assembly) Millimeter wave radar sensor assembly

DTC Detection Conditions:

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	While the vehicle is being driven at a speed of 5 km/h (4 mph) or more.	○	○
Malfunction Status	The millimeter wave radar sensor assembly receives yaw rate and acceleration sensor (airbag sensor assembly) malfunction signals from yaw rate and acceleration sensor (airbag sensor assembly).	○	-
Malfunction Status	The millimeter wave radar sensor assembly receives yaw rate and acceleration sensor (airbag sensor assembly) zero point malfunction signals from skid control ECU (brake actuator assembly).	-	○
Detection Time		10 seconds	1 second
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

CAUTION / NOTICE / HINT

NOTICE:

When replacing the millimeter wave radar sensor assembly, always replace it with a new one.
When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.
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The pre-collision system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.
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PROCEDURE

1.	CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

HINT:

Pre-collision system DTC C1A46 may be stored due to a malfunction in the VSC system. Therefore, it is necessary to check for and troubleshoot VSC system DTCs first.

(a) Check for DTCs.

Click here

Chassis > ABS/VSC/TRAC/EPB > Trouble Codes

Result	Proceed to
Vehicle stability control system DTCs are not output	A
Vehicle stability control system DTCs are output	B

GO TO VEHICLE STABILITY CONTROL SYSTEM

2.	CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Click here

Body Electrical > Pre-Collision 2 > Clear DTCs

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

HINT:

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

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Body Electrical > Pre-Collision 2 > Trouble Codes

Result	Proceed to
DTC C1A46 is not output	A
DTC C1A46 is output	B

USE SIMULATION METHOD TO CHECK

3.	REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Replace the millimeter wave radar sensor assembly.

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(b) Adjust the millimeter wave radar sensor assembly.

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4.	CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Click here

Body Electrical > Pre-Collision 2 > Clear DTCs

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

HINT:

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

Click here

Body Electrical > Pre-Collision 2 > Trouble Codes

Result	Proceed to
DTC C1A46 is not output	A
DTC C1A46 is output	B

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

5.	REPLACE YAW RATE AND ACCELERATION SENSOR (AIRBAG SENSOR ASSEMBLY)

(a) Replace the yaw rate and acceleration sensor (airbag sensor assembly).

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6.	CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Click here

Body Electrical > Pre-Collision 2 > Clear DTCs

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

HINT:

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

Click here

Body Electrical > Pre-Collision 2 > Trouble Codes

Result	Proceed to
DTC C1A46 is not output	A
DTC C1A46 is output	B

END (YAW RATE AND ACCELERATION SENSOR (AIRBAG SENSOR ASSEMBLY) WAS DEFECTIVE)

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

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