GSIC - Global Service Information Center

### DTC C1243/43 Acceleration Sensor Stuck Malfunction

### DTC C1244/44 Open or Short in Deceleration Sensor Circuit

### DTC C1245/45 Acceleration Sensor Output Malfunction

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## DESCRIPTION

This sensor detects vehicle deceleration. The sensor signal is used in ABS control. If the sensor functions abnormally, the ABS warning light turns ON.

DTC No. | DTC Detection Condition | Trouble Area

C1243/43

Following condition repeats 16 times:
GL1 does not change when vehicle decelerates from 30 km/h (19 mph) to 0 km/h (0 mph)

1. Deceleration sensor
2. Deceleration sensor circuit

C1244/44

When one of following (1 to 3) is detected:
1. Deceleration G calculated by ECU based on GL1 signal is not within -1.5 and 1.5 G for 1.2 sec.
2. When sensor operating voltage is not within 4.75 to 5.25 V
3. Deceleration sensor malfunction signal occurs more than 7 times

1. Deceleration sensor
2. Deceleration sensor circuit

C1245/45

Difference between value calculated from deceleration sensor value and vehicle speed exceeds 0.35 G for at least 60 seconds

1. Deceleration sensor
2. Deceleration sensor circuit

## WIRING DIAGRAM

## INSPECTION PROCEDURE

1.CHOOSE DIAGNOSIS METHOD

1. Choose the diagnosis method.

   Method
   Method | Proceed to
   Using intelligent tester | A
   Not using intelligent tester | B

| B |

Go to step 3

A |

2.READ VALUE OF INTELLIGENT TESTER (DECELERATION SENSOR 1)

1. Check the Data List for proper functioning of the deceleration sensor.

   Skid control ECU
   Item | Measurement Item / Range (Display) | Normal Condition | Diagnostic Note
   Deceleration Sensor 1 | Deceleration sensor 1 reading / min.: -1.869 G, max.: 1.869 G | Approx. 0 +- 0.13 G when vehicle is not moving. | Reading changes when vehicle is shaken

   OK:
     Deceleration value changes.

| OK |

REPLACE BRAKE ACTUATOR ASSEMBLY

NG |

3.INSPECT DECELERATION SENSOR

1. Remove the console box and deceleration sensor.

1. Connect 3 dry cell batteries of 1.5 V in series.

   HINT:
     Do not apply voltage of 6 or more to terminals 3 (VGS) and 2 (GGND).

1. Check the output voltage of terminal 1 (GL1) when the sensor is tilted forward and rearward.

   Standard voltage:

     Tester Connection | Sensor Position | Specified Condition
     1 (GL1) - Battery's negative (-) lead | Horizontal | Approx 2.5 V
     1 (GL1) - Battery's negative (-) lead | Tilted forward | Approx 0.5 to 2.5 V
     1 (GL1) - Battery's negative (-) lead | Tilted rearward | Approx 2.5 to 4.5 V

   HINT:
   1. If the sensor is tilted too much, it may output the wrong value.
   2. If the voltage drops, the sensor should be replaced with a new one.
   3. When replacing the sensor, it should not be placed upside down.

| NG |

REPLACE DECELERATION SENSOR

OK |

4.CHECK WIRE HARNESS (SKID CONTROL ECU - DECELERATION SENSOR)

1. Disconnect the S2 ECU connector.

1. Disconnect the A17 sensor connector.

1. Measure the resistance of the wire harness side connectors.

   Standard resistance:

     Tester Connection | Specified Condition
     S2-4 (GL1) - A17-1 (GL1) | Below 1 Ω
     S2-7 (GGND) - A17-2 (GGND) | Below 1 Ω
     S2-28 (VGS) - A17-3 (VGS) | Below 1 Ω
     A17-1 (GL1) - Body ground | 10 kΩ or higher
     A17-2 (GGND) - Body ground | 10 kΩ or higher
     A17-3 (VGS) - Body ground | 10 kΩ or higher

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

5.CHECK FOR DTC

1. Install the deceleration sensor to the vehicle.

1. Clear the DTCs.

1. Drive the vehicle at 6 km/h (4 mph) or more.

1. Check for DTCs.

   Result
   Result | Proceed to
   DTC is output | A
   DTC is not output | B

| B |

END

A |

REPLACE BRAKE ACTUATOR ASSEMBLY