Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 abswebdb cic03715
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DI-297
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI6O2-02
DTC C0371 / 55 Yaw Rate Sensor Circuit
CIRCUIT DESCRIPTION
DTC No. DTC Detecting Condition Trouble Area
Detection of any of conditions from 1. through 4.:
1. The voltage of sensor signal is out of range.
2. The offset value of sensor signal is outside the plausible
S Yaw rate sensor
C0371 / 55 range.
S Yaw rate sensor circuit
3. Sensor signal change rapidly under normal driving.
4. Sensor is more or worse sensitivity than reference yaw
rate during cornering.
WIRING DIAGRAM
Yaw Rate Sensor Skid Control ECU
(Shielded) (Shielded)
2 2 17
B B
YD Y1 IC3 V14 YD
1 8 18
Y Y
GYW2 Y1 IC3 V14 GYAW
4 7 19
L L
YAW2 Y1 IC3 V14 YAW
15
IC3
BR BR
BR
ED
F13452
2001 SIENNA (RM787U)
Author : Date : 451
DI-298
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the TOYOTA hand-held tester and start from step 4 in case
of not using the TOYOTA hand-held tester.
1 Check output value of the yaw rate sensor.
PREPARATION:
(a) Remove the 2 nuts and yaw rate sensor with connector
still connected.
(b) Connect the TOYOTA hand-held tester to the DLC3.
(c) Turn the ignition switch ON and push the TOYOTA hand-
held tester main switch ON.
(d) Select the DATALIST mode on the TOYOTA hand-held
tester.
F12356 CHECK:
Check that the yaw rate value of the yaw rate sensor displayed
on the TOYOTA hand-held tester is changing: Place the yaw
rate sensor vertically to the ground and turn the sensor pivoted
on its center.
OK:
Yaw rate value must be changing.
NG Go to step 4.
OK
2 Check the steering angle sensor zero point.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.
(c) Select the DATALIST mode on the TOYOTA hand-held tester.
CHECK:
Check whether steering angle sensor value is nearly equal to 0 degree when steering wheel is adjusted to
neutral.
NG Calibrate the steering angle sensor zero point
(See page DI-259 ).
OK
2001 SIENNA (RM787U)
Author : Date : 452
DI-299
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
3 Check whether continuity exists between terminal YD of yaw rate sensor and ter-
minal YD of skid control ECU.
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.
4 Check yaw rate sensor.
CHECK:
(-) (+) 4 (a) Turn the ignition switch ON.
(b) Measure the voltage between terminals IGA (3) and
GYW2 (1), YAW2 (4) and GYW2 (1) of the yaw rate sensor
with connector still connected.
OK:
1 3
Terminals 3 and 1
Approx. 12 V
(IGA - GYW2)
(-) (+)
F12357 Terminals 4 and 1
Approx. 2.5 V
(YAW2 - GYW2)
NG Replace yaw rate sensor.
OK
5 Check for open and short circuit in harness and connector between yaw rate
sensor and skid control ECU (See page IN-31 ).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.
2001 SIENNA (RM787U)
Author : Date : 453
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