Toyota 4Runner manuals

Toyota 4Runner: 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.

(c) Turn the ignition switch to ON.

(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


B

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


C

REPAIR CIRCUIT INDICATED BY OUTPUT DTC

A

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.


NG

INSTALL YAW RATE AND ACCELERATION SENSOR CORRECTLY

OK

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


(c) Measure the resistance according to the value(s) in the table below.

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


A

REPLACE YAW RATE AND ACCELERATION SENSOR


B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


C

REPAIR OR REPLACE HARNESS OR CONNECTOR

Zero Point Calibration of Yaw Rate Sensor Undone (C1210,C1336)
DESCRIPTION The skid control ECU receives signals from the yaw rate and acceleration sensor via the CAN communication system. The yaw rate sensor has a built-in acceleration sensor and detects the ...

Low Power Supply Voltage Malfunction (C1241)
DESCRIPTION If the voltage supplied to the IG1 terminal is within the DTC detection range due to malfunctions in components such as the battery and generator circuit, this DTC is stored. ...

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