Hyundai Santa Fe (2006 year). Manual - part 236

BR -116

BRAKE SYSTEM

SELF TEST CIRCUIT INSPECTION

Measure waveform between terminal "2" of the Yaw Rate

＆

Lateral G sensor harness connector and chassis ground.

1. Battery +
2. Yaw-Rate self test line
3. Yaw-Rate reference line
4. Ground
5. Lateral G sensor signal
6. Yaw-Rate sensor signal

Approx . 0 V

Approx . 7 V

Yaw-Rate self test line - Channel B

<C260>

SCMBR6554L

Is the measured waveform within specifications?

YES

▶

Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU and

then go to "Verification Of Vehicle Repair" procedure.

▶

Check for open or short to GND in the Yaw Rate

＆

Lateral G sensor harness between terminal "2" of the Yaw

Rate

＆

Lateral G sensor harness connector and terminal "37" of the chassis ground. Repair as necessary and then

go to "Verification Of Vehicle Repair" procedure.

ABS (ANTI-LOCK BRAKE SYSTEM)

BR -117

COMPONENT INSPECTION

E23E2E86

Ignition "ON"

＆

Engine "OFF".

Measure voltage between terminal "3,5,6" of the Yaw Rate

＆

Lateral G sensor harness connector and chassis ground.

Specification : Approx. 2.5V ( Voltage between terminal "5, 6" of the HECU harness connector and chassis ground.)
Specification : Approx. above 2.1 V and below 2.9 V ( Voltage between terminal "3" of the
HECU harness connector and chassis ground.)

1. Battery +
2. Yaw-Rate self test line
3. Yaw-Rate reference line
4. Ground
5. Lateral G sensor signal
6. Yaw-Rate sensor signal

<C260>

SCMBR6555L

Is the measured voltage within specifications?

YES

▶

Fault is intermittent caused by poor connection in Yaw Rate

＆

Lateral G sensor harness. Go to "Verification Of

Vehicle Repair" procedure.

▶

Substitute with a known-good Yaw Rate

＆

Lateral G sensor and check for proper operation. If problem is corrected,

replace Yaw Rate

＆

Lateral G sensor and then go to "Verification Of Vehicle Repair" procedure.

VERIFICATION OF VEHICLE REPAIR

EA225D1E

Refer to DTC C1101.

BR -118

BRAKE SYSTEM

DTC C1283 YAW RATE AND LATERAL G SENSOR - SIGNAL

COMPONENT LOCATION

E67FB030

Refer to DTC C1282.

GENERAL DESCRIPTION

EE82842A

Refer to DTC C1282.

DTC DESCRIPTION

EC6257CA

A lateral acceleration reference signal is calculated from the wheel speeds, the steering angle and the yaw rate signals
to observe the lateral acceleration sensor signal. The difference between the reference signal and the sensor signal is
evaluated for failure detection. A yaw rate reference signal is calculated from the wheel speeds, the steering angle and
the lateral acceleration signals to observe the yaw rate sensor signal. The difference between the reference signal and
the sensor signal, and the gradient of the measured sensor signal is evaluated for the failure detection. If the difference
between estimated value and measured value of the sensor is larger than predefined value for predefined time, the failure
is recognized. Plauibility faults (signals received which fall outside of the sensor characteristics) are also recognized.

DTC DETECTING CONDITION

E57CA66D

Item

Detecting Condition

Possible cause

DTC Strategy

• Signal Monitoring

Monitoring

Period

• Continuous (during stable driving)

Case 1

Enable

Conditions

• By building a reference lateral G from the

yaw-rate sensor, wheel speed sensor and the
SAS it is possible to test the lateral G Signal on
plausibility. If during stable vehicle behavior an
lateral G Failure larger than approximately 2.5
m/s2 occurs, the ESP controller will disregard the
lateral G sensor information so that a false ESP
intervention is prevented. A fault is recognized
after 1.6 s during model validity.

• The measured and offset compensated yaw rate

signal is compared to the reference yaw rate
signal calculated from yaw rate sensor, lateral
G sensor, SAS and wheel speed sensor. If the
measured yaw rate deviates more than 2.5 /s plus
a dynamic threshold from the reference yaw rate
during model validity, a failure is recognized after
1.6 s. The dynamic threshold is between 2.5 /s
and more than 5 /s. A typical value is 3 /s.
- During the possibility to observe the recognition
time depends on the amount of failure.

• Inoperative Yaw Rate

＆

Lateral G sensor

• Open or short of Yaw Rate

＆

Lateral G sensor

• Inoperative HECU

ABS (ANTI-LOCK BRAKE SYSTEM)

BR -119

Item

Detecting Condition

Possible cause

Monitoring

Period

• Continuous (during driving)

Case 2

Enable

Conditions

• During normal driving conditions the long time

filtered driving direction is straight ahead. The
long time filtered later G value is equivalent to
the offset. If the offset value exceeds a threshold
of approximately 2.25 m/s

an later G fault is

determined.Failure detection time depends on
the driving distance, vehicle speed and on the
amount of failed later G signal. Within 30 km
of symmetrical driving the calculated offset
corresponds to the sensor offset.

Monitoring

Period

• Continuous (If no under voltage is detected)

Case 3

Enable

Conditions

• A fault is detected If the lateral G is higher than

15 m/s

for more than 800 ms.

Monitoring

Period

• Continuous (during standstill)

Case 4

Enable

Conditions

• If the filtered value of |lateral G| is larger than 7

m/s

for more than 400 m/s a fault is set.

Monitoring

Period

• Continuous (dependent on driving situation)

Case 5

Enable

Conditions

• Standstill compensation :

- The offset corresponds to the measured and
filtered input value. Failure threshold 5.25 /s.

• Fast compensation (during driving if no standstill

compensation could be completed):
- The offset corresponds to the slightly filtered
deviation between measured yaw rate and
the reference yaw rate calculated from SAS,
lateral G sensor and wheel speed sensor.
Failure threshold is 7.5 /s.

• Long-term ("normal") compensation (during

driving after successful standstill or fast
offset compensation):
- The offset corresponds to the strong filtered
deviation between measured yaw rate and
the reference yaw rate calculated from SAS,
lateral G sensor and wheel speed sensor.
Failure threshold is 7.5 /s

Monitoring

Period

• After every standstill.

Case 6

Enable

Conditions

• The measured yaw rate and the model yaw rates,

calculated from the wheel speed sensor and SAS
are compared. If the signals doesn.t fit and forward
driving is recognized, a fault is determined.

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