Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM000001A6G007X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1233/33,C1234/34; Open or Short Circuit in Yaw Rate Sensor Circuit; 2007 MY LX470 [08/2006 -        ]

DTC

C1233/33

Open or Short Circuit in Yaw Rate Sensor Circuit

DTC

C1234/34

Yaw Rate Sensor Malfunction

DESCRIPTION

DTC No.

DTC Detection Condition

Trouble Area

1233/33

When any of the following 1. through 4. is detected:

  1. ECU terminal IG1 voltage is 9.5 V to 17.0 V, and the condition that yaw rate sensor voltage is out of the range from 0.25 V to 4.75 V continues for 1 sec. or more.
  2. The conditions that yaw rate sensor open detect circuit signal is ON and the voltage of ECU terminal IG1 is 9.5 V to 17 V continue for 1 sec. or more.
  3. The conditions that yaw rate sensor power source voltage is out of the range from 4.4 V to 5.6 V and the voltage of ECU terminal IF1 is 9.5 V to 17 V continue for 1 sec. or more.
  4. When the condition that yaw rate sensor signal is momentarily open occurs 10 times or more and the voltage of ECU terminal IG1 is 9.5 V to 17 V.
  • Yaw rate sensor
  • Yaw rate sensor circuit

C1234/34

Condition 1. or 2. is detected:

  1. When the conditions that yaw rate sensor VYS terminal voltage is 4.75 V to 5.25 V and YD malfunction signal of yaw rate sensor is ON continue for 5 sec. or more.
  2. Shift lever is in P position and output voltage of yaw rate sensor is out of the range from 2.4 V to 2.6 V or after the difference from zero point calibration voltage of yaw rate sensor becomes 0.08 V or more and when the condition that the vehicle speed exceeds more than 15 km/h (9 mph) while output condition of yaw rate sensor is repeated more than 3 times.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

PERFORM ZERO POINT CALIBRATION OF THE YAW RATE SENSOR
NEXT

2.

CHECK FOR DTC

(a) Turn the ignition switch ON.

(b) Check that the VSC TRAC warning light illuminates.

(c) Check if the same DTCs are recorded.

Result

Result

Proceed to

DTC is not output (when using intelligent tester)

A

DTC is not output (when not using intelligent tester)

B

DTC is output

C
B

GO TO STEP 4

C

REPAIR CIRCUIT INDICATED BY OUTPUT DTC

A

3.

READ VALUE USING INTELLIGENT TESTER (YAW RATE SENSOR)

(a) Using the DATA LIST, check for proper functioning of the yaw rate sensor.

Skid control ECU assembly:

Item

Measurement Item / Range (Display)

Normal Condition

Diagnostic Note

YAW RATE

Yaw rate sensor /

Min.: -128 deg/s, Max.: 128 deg/s

-

-

YAW ZERO VALUE

Memorized zero value /

Min.: -128 deg/s, Max.: 128 deg/s

-

-

OK:

Yaw rate value must be changing.

(Reference) When the yaw rate sensor is stationary output values: +-4 deg/s

OK

REPLACE SKID CONTROL ECU ASSEMBLY

NG

4.

CHECK YAW RATE SENSOR (YAW2, YD VOLTAGE)

(a) Remove the yaw rate sensor but do not disconnect the connector.

(b) Turn the ignition switch ON.

(c) Measure the voltage of the connector.

Standard voltage:

Tester Connection

Specified Condition

1 (YAW2) - 5 (GYAW)

2.42 to 2.58 V

6 (YD) - 5 (GYAW)

4.5 to 5.3 V
NG

REPLACE YAW RATE SENSOR

OK

5.

CHECK SKID CONTROL ECU ASSEMBLY (YD VOLTAGE)

(a) Remove the skid control ECU but do not disconnect the connectors.

(b) Turn the ignition switch ON.

(c) Measure the voltage of the connectors.

Standard voltage:

Tester Connection

Specified Condition

A41-19 (YD) - A40-17 (GND4)

4.5 to 5.3 V

A41-19 (YD) - A40-8 (GND3)

4.5 to 5.3 V

A41-19 (YD) - A39-6 (GND2)

4.5 to 5.3 V

A41-19 (YD) - A39-31 (GND1)

4.5 to 5.3 V
NG

REPLACE SKID CONTROL ECU ASSEMBLY

OK

6.

CHECK WIRE HARNESS (SKID CONTROL ECU ASSEMBLY - YAW RATE SENSOR)
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE SKID CONTROL ECU ASSEMBLY