Justin's Toyota Service

Read Value Of Data List Yaw Rate Sensor

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a. Remove the 2 bolts and the yaw rate (deceleration) sensor assembly with the connector still connected.

b. Connect the intelligent tester to the DLC3.

c. Turn the ignition switch to the ON position and push the intelligent tester main switch ON.

d. Select DATA LIST mode on the intelligent tester.

e. Check that the decelerate value of the deceleration sensor displayed on the intelligent tester changes: Place the deceleration sensor vertically to the ground and turn the sensor to the front-ward and rearward.

Fig. 52: Turning Sensor To Front-Ward And Rearward f-J ¡il l M&i B>

Fig. 52: Turning Sensor To Front-Ward And Rearward

DATA LIST

Item	Measurement Item / Range (Display)	Normal Condition	Diagnostic Note
DECELERAT SENS	Deceleration sensor 1 reading / min.: -1.869 G, max.: 1.869 G	Approximately 0 +- 0.13 G while stationary	Reading changes when vehicle is bounced
DECELERAT SENS2	Deceleration sensor 2 reading / min.: -1.869 G, max.: 1.869 G	Approximately 0 +- 0.13 G while stationary	Reading changes when vehicle is bounced

NG: REPLACE YAW RATE SENSOR OK: GO TO Next Step

3. INSPECT YAW RATE SENSOR

a. Disconnect the yaw rate (deceleration) sensor connector.

b. Turn the ignition switch to the ON position.

c. Measure the voltage between terminals VYS and GYAW of the yaw rate (deceleration) sensor harness side connector.

Voltage: 10 to 14 V OK: CHECK AND REPLACE YAW RATE SENSOR

Yaw Rate (Deselection) Sensor

Fig. 53: Identifying Yaw Rate (Deceleration) Sensor Connector Terminals NG: GO TO Next Step

4. CHECK HARNESS AND CONNECTOR (YAW RATE SENSOR - SKID CONTROL ECU)

a. Check for open and short circuit in harness and connector between yaw rate sensor and skid control ECU (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE SKID CONTROL ECU

DTC C1234/34 YAW RATE SENSOR MALFUNCTION

DESCRIPTION

Yaw rate sensor detects the vehicle's side slip and sends signals to the skid control ECU.

DTC TROUBLE DETECTION CONDITION

2007 BRAKES Brake Control - Sequoia

DTC No.	DTC Detecting Condition	Trouble Area
C1234/34	When any of the following conditions are detected: 1. Power output of 4.65 V or more or 0.25 or less continues for 0.1 sec. or more. 2. Difference between the actual output value of the yaw rate sensor and the output value calculated from the other sensor's continues to be large.	• Yaw rate (deceleration) sensor • Yaw rate (deceleration) sensor circuit

WIRING DIAGRAM

Fig. 54: Yaw Rate Sensor Malfunction - Wiring Diagram INSPECTION PROCEDURE

Fig. 54: Yaw Rate Sensor Malfunction - Wiring Diagram INSPECTION PROCEDURE

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