Hyundai Santa Fe (2006 year). Manual — part 236
BR -116
BRAKE SYSTEM
SELF TEST CIRCUIT INSPECTION
1.
Measure waveform between terminal "2" of the Yaw Rate
&
Lateral G sensor harness connector and chassis ground.
1
4
5
6
2
3
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
2.
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.
NO
▶
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
1.
Ignition "ON"
&
Engine "OFF".
2.
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
4
5
6
2
3
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>
V
SCMBR6555L
3.
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.
NO
▶
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
²
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
²
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
²
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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