Dtc C1243 Acceleration Sensor Stuck Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

CHECK ACCELERATION SENSOR

CHECK TERMINAL VOLTAGE (IG, GND)

DTC C1243 Acceleration Sensor Stuck Malfunction

DTC C1245 Acceleration Sensor Output Malfunction

DTC C1279 Acceleration Sensor Output Voltage Malfunction (Test Mode DTC)


DESCRIPTION

The skid control ECU receives signals from the acceleration sensor via the CAN communication system.
The acceleration sensor detects the vehicle's condition using 2 circuits (GL1, GL2).
If there is trouble in the bus lines between the acceleration sensor and the CAN communication system, DTC U0124 (malfunction in CAN communication with the acceleration sensor) are stored.
These DTCs are also stored when calibration has not been completed.
DTC C1279 can be cleared when the acceleration sensor sends an acceleration signal or test mode ends. DTC C1279 is stored only in test mode.

DTC Code
DTC Detection Condition
Trouble Area
C1243
While the vehicle speed changes from 30 km/h (19 mph) to 0 km/h (0 mph), the condition that the values of GL1 and GL2 do not change by 0.0294 G or more occurs 16 times or more.
  1. ECU-IG NO. 1 fuse
  2. Acceleration sensor
  3. Acceleration sensor circuit
  4. Sensor installation
  5. CAN communication system
C1245
At a vehicle speed of 30 km/h (19 mph) or more, the difference between the forward and backward G calculated from the acceleration sensor value and that calculated from the vehicle speed exceeds 0.35 G for 60 seconds or more.
C1279
Stored only during test mode.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1243 Acceleration Sensor Stuck Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the acceleration sensor, perform calibration (LandCruiser RM000000XHR0BJX.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
When DTC U0124 is output together with DTC C1243 and/or C1245, inspect and repair the trouble areas indicated by DTC U0124 first (LandCruiser RM000000YUO0SXX.html).
1.CHECK DTC

  1. Clear the DTCs (LandCruiser RM000000XHV0KDX.html).

  1. Turn the ignition switch off.

  1. At a speed of 30 km/h (19 mph) or more, drive the vehicle, turn the steering wheel and decelerate (depress the brake pedal) the vehicle.

  1. Turn the ignition switch to ON again and check that no CAN communication system DTC is output (LandCruiser RM000000XHV0KDX.html).

    Result
    Result
    		Proceed to
    DTC output (relating to acceleration sensor)
    		A
    DTC output (relating to CAN communication system)
    		for LHD without Entry and Start System
    		B
    DTC output (relating to CAN communication system)
    		for RHD without Entry and Start System
    		C


B
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (LandCruiser RM000001RSO0BYX.html)

C
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (LandCruiser RM000001RSO0C0X.html)
A


2.CHECK ACCELERATION SENSOR

  1. Turn the ignition switch off.

  1. Check that the acceleration sensor is installed properly (LandCruiser RM000000SS207WX.html).

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


NG
INSTALL ACCELERATION SENSOR CORRECTLY (LandCruiser RM000000SS207WX.html)
OK


3.CHECK TERMINAL VOLTAGE (IG, GND)

  1. Disconnect the G52 acceleration sensor connector.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1243 Acceleration Sensor Stuck Malfunction

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G52-4 (IG) - Body ground
    		Ignition switch ON
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G52-1 (GND) - Body ground
    		Always
    		Below 1 Ω
Text in Illustration
*a
Front view of wire harness connector
(to 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


B
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM000000XHN0IUX.html)

C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A

REPLACE ACCELERATION SENSOR (LandCruiser RM000000SS507KX.html)