Toyota 4Runner: Acceleration Sensor Stuck Malfunction (C1232,C1243,C1245,C1279)

Toyota 4Runner Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Acceleration Sensor Stuck Malfunction (C1232,C1243,C1245,C1279)

DESCRIPTION

The skid control ECU receives signals from the yaw rate and acceleration sensor via the CAN communication system.

If there is trouble in the bus lines between the yaw rate and acceleration sensor and the CAN communication system, DTCs U0123 (yaw rate sensor communication trouble) and U0124 (acceleration sensor communication trouble) are stored.

DTC Code	DTC Detection Condition	Trouble Area
C1232	At a vehicle speed of 10 km/h (6 mph) or more, the fluctuation range of the signal from one of either GL1 or GL2 is below 80 mV and the fluctuation range of the signal of the other is higher than 1.9 V for 30 seconds or more.	ECU-IG NO. 1 fuse Sensor installation Harness or connector Yaw rate and acceleration sensor CAN communication system
C1243	The following condition repeats 16 times. GL1 and GL2 do not change when the vehicle decelerates from 30 km/h (19 mph) to 0 km/h (0 mph).
C1245	The following condition continues for at least 60 seconds. The difference between the values calculated from the acceleration sensor value and vehicle speed exceeds 0.35 G.
C1279	Stored during test mode.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the yaw rate and acceleration sensor, perform calibration (See page ).

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	CHECK FOR DTC

(a) Clear the DTCs (See page ).

(b) Turn the ignition switch off.

(d) Check if DTCs U0073, U0123, C1210 and/or C1336 are output (See page ).

Result

Result	Proceed to
DTC U0073, U0123, C1210 and/or C1336 are not output	A
DTC U0073 and/or U0123 are output	B
DTC C1210 and/or C1336 are output	C

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

REPAIR CIRCUIT INDICATED BY OUTPUT DTC

2.	CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION

(a) Check that the yaw rate and acceleration sensor is installed properly.

OK:

The sensor is tightened to the specified torque. The sensor is not tilted.

INSTALL YAW RATE AND ACCELERATION SENSOR CORRECTLY

3.	CHECK TERMINAL VOLTAGE AND RESISTANCE (IG, GND)

(a) Disconnect the F36 yaw rate and acceleration sensor connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F36-4 (IG) - Body ground	Ignition switch ON	11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
F36-1 (GND) - Body ground	Always	Below 1 Ω

Text in Illustration

*a	Front view of wire harness connector (to Yaw Rate and Acceleration Sensor)

Result

Result	Proceed to
OK (When troubleshooting in accordance with Diagnostic Trouble Code Chart)	A
OK (When troubleshooting in accordance with Problem Symptoms Table)	B
NG	C

REPLACE YAW RATE AND ACCELERATION SENSOR

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

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