3.
Monitor signal waveform between terminal 1 of stop lamp switch connector and chassis ground, operating the brake pedal.
The brake switch is connected with the brake pedal and its signal is transmitted to the ECM/TCM.
This signal is used as a kind of safety equipment in order to detect a malfunction of a acceleration pedal.
The brake switch is composed of two switches for reliability. One switch detects the other's malfunction.
TCM senses the operation of brake with this electrical signal and uses the signal for HIVEC learning function.
Item | Detecting Condition & Fail Safe | Possible cause |
DTC Strategy | ● Voltage monitering | ● Brake switch components ● Brake pedal hight ● Brake switch circuit |
Enable Conditions | ● Engine RUN | |
Threshold value | ● Output speed sensor≥240rpm(At driving a vehicle with 6Km/h speed), BRAKE SW ON for more than 5minutes. | |
Diagnostic Time | ● Continuous 5 minutes | |
Fail Safe | ● Prohibit INTELLIGENT-SHIFT until IG-KEY OFF |
BRAKE | VALUE |
Working | ON |
NOT Working | OFF |
IG KEY ON, ENG ON
Stop lamp switch connector: Connect
Monitor signal waveform between terminal 1 of stop lamp switch connector and chassis ground, operating the brake pedal.
When the DTC P0703 sets, check the service data of the brake switch.
Operating the brake pedal, check if there is a change of ON/OFF signal.
Many malfunctions in the electrical system may be caused from poor harness and terminals. These faults can be caused by interference from other electrical systems and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
▶ Repair as necessary and go to "Verification vehicle Repair" procedure.
▶ Go to the next procedure.
Power Supply Circuit Inspection
IG KEY ON, ENG OFF
Stop lamp switch connector: Disconnect
Measure voltage between terminal 2 of stop lamp switch harness connector and chassis ground
Specification : 11.5V~12.5V
Does the voltage display near the specified value?
▶ Proceed next inspection procedure.
▶ Repair open or short circuit between battery (+) and the terminal 2 of the stop lamp switch.
Signal circuit inspection
Battery (-) terminal: Disconnect
Stop lamp switch connector: Disconnect
TCM connector: Disconnect
Measure resistance between terminal 1 of stop lamp switch connector and TCM connector.
Specification : Approx. 0Ω
Is resistance display near the specified value?
▶ Proceed next inspection procedure.
▶ Repair open circuit between the terminal 1 of the stop lamp switch and the TCM connector.
IG KEY OFF, ENG OFF
Stop lamp switch connector: Disconnect
Measure resistance between terminal 1 and 2 of stop lamp switch connector.
Specification :
BRAKE PEDAL ON | BRAKE PEDAL OFF |
Approx. ∞Ω | Approx. 0Ω |
Is resistance display near the specified value?
▶ System OK.
▶ After checking the brake pedal height and installation, if there is no trouble, replace it.
