Toyota CH-R Service Manual: Zero Point Calibration of Acceleration Sensor Undone (C1336)

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via CAN communication.

The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition using 2 circuits (GL1, GL2). If there is trouble in the bus lines between the yaw rate and acceleration sensor (airbag sensor assembly) and the CAN communication system, the DTC U0123 (Lost Communication with Yaw Rate Sensor Module) is output.

The DTCs are also output when the calibration has not been completed.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1336	Zero Point Calibration of Acceleration Sensor Undone	Zero point calibration of acceleration sensor undone.	Sensor installation Acceleration sensor (airbag sensor assembly) Skid control ECU (brake actuator assembly)

CAUTION / NOTICE / HINT

HINT:

When U0073, U0123 and/or U0126 is output along with C1336, inspect and repair trouble areas indicated by U0073, U0123 and/or U0126 first.

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PROCEDURE

1.	PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR

(a) Perform zero point calibration of the yaw rate and acceleration sensor.

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Chassis > ABS/VSC/TRAC/EPB > Utility

Tester Display
Reset Memory

Chassis > ABS/VSC/TRAC/EPB > Utility

Tester Display
Test Mode

NEXT

2.	PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

(a) Turn the ignition switch off.

(b) Using the Techstream, perform a Test Mode (signal check) inspection sensor check and check that all Test Mode (signal check) inspection items change from incomplete to complete.

Click here

Chassis > ABS/VSC/TRAC/EPB > Utility

Tester Display
Signal Check

OK:

All Test Mode (signal check) inspection items change from incomplete to complete

OK

END

NG

3.	CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

(a) Turn the ignition switch off.

(b) Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly.

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OK:

The sensor should be tightened to the specified torque.

The sensor should not be installed in a tilted position.

NG

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY

OK

4.	READ VALUE USING TECHSTREAM (YAW RATE AND ACCELERATION SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Select the Data List using the Techstream.

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Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Deceleration Sensor	Acceleration sensor	Min.: -18.525 m/s2 Max.: 18.387 m/s2	-	During deceleration/acceleration: Changes continuously
Deceleration Sensor2	Acceleration sensor 2 reading	Min.: -18.525 m/s2 Max.: 18.387 m/s2	-	During deceleration/acceleration: Changes continuously
Yaw Rate Sensor	Yaw rate sensor	Min.: -128°/s Max.: 127°/s	Vehicle stopped: 0°/s Turning right: -128 to 0°/s Turning left: 0 to 127°/s	-

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display
Deceleration Sensor
Deceleration Sensor2
Yaw Rate Sensor

(d) Check the yaw rate and acceleration sensor (airbag sensor assembly) output value displayed on the Techstream.

OK:

The yaw rate and acceleration sensor (airbag sensor assembly) output value is normal.

NOTICE:

Check the yaw rate and acceleration sensor signal after replacement.

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HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.

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OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPLACE AIRBAG SENSOR ASSEMBLY