10438558-10438566-10438568-10438570-10438556-10438560-10438562-10438564

GENERAL DESCRIPTION

The Stop lamp switch is used to judge whether the acceleration system is abnormal or not. The stop lamp switch has a duplex system(signals brake test or brake light) to memorize the abnormality when the signals of depressing and releasing the brake pedal are detected simultaneously.

DTC DESCRIPTION

Checking output signals from both brake switch. when all of them are On or OFF simultaneously, if abnormal signal is detected for more than 0.5 sec., an error is recognized. And if this condition lasts for certain period, PCM sets P0504. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till cosecutive 2 driving cycle.

DTC DETECTING CONDITION

Item		Detecting Condition	Possible cause
DTC Strategy		● Comparing 2 brake signals during driving	● Poor connection ● Open or short in brake switch ● Faulty Brake switch
Enable Conditions	Case 1	● Engine works ● Vehicle Speed Sensor is abnormal.
	Case 2	● Engine works ● Vehicle Speed Sensor is normal and Vehicle Speed is over 20kph during 1sec or more.
Threshold value		● The one brake signal's change duration when another signal has been changed 〉0.5 sec
Diagnosis Time		● Continuous
MIL On Condition		● 2 driving cycles

SPECIFICATION

Item	During taking off the brake	During stepping on the brake
Brake Lamp Switch	0V	Battery voltage
Brake Switch	Battery voltage	0V

SCHEMATIC DIAGRAM

MONITOR DTC STATUS

Check DTC Status

(1)

Connect scantool to Data Link Connector(DLC).

(2)

IG "ON".

(3)

Select "Diagnostic Trouble Codes(DTCs)" mode, and then Press F4(DTAL) to check DTC's information from the DTCs menu

(4)

Read "DTC Status" parameter.

(5)

Is parameter displayed "Present fault"?

▶ Go to "Terminal and connector inspection" procedure.

▶ Fault is intermittent caused by poor contact in the sensor’s and/or PCM’s connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

TERMINAL AND CONNECTOR INSPECTION

Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also 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 of Vehicle Repair" procedure

▶ Go to " Power Circuit Inspection " procedure.

POWER CIRCUIT INSPECTION

Votage check

(1)

IG Key "OFF".

(2)

Disconnect the PCM connector.

(3)

IG Key "ON" and keep the brake taking off.

(4)

Measure the voltage between terminal 21 of PCM harness connector and chassis ground.

(5)

Measure the voltage between terminal 23 of PCM harness connector and chassis ground .

(6)

Keep the brake stepping on.

(7)

Measure the voltage between terminal 21 of PCM harness connector and chassis ground.

(8)

Measure the voltage between terminal 23 of PCM harness connector and chassis ground .

Specification :

Item	During taking off the brake	During stepping on the brake
Brake Lamp Switch	0V	Battery voltage
Brake Switch	Battery voltage	0V

(9)

Is the measured voltage within specification ?

▶ Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair as necessary and go to "Verification of Vehicle Repair" procedure.

▶ Go to "Check open in harness" as follows.

Check open in harness

(1)

IG Key "OFF".

(2)

Disconnect the brake switch and PCM connector.

(3)

Measure the resistance between terminal 21 of PCM harness connector and terminal 3 of Brake switch harness side.

(4)

Measure the resistance between terminal 23 of PCM harness connector and terminal 1 of Brake switch harness side.

Specification : Approx. below 1Ω

(5)

Is the measured resistance within specification ?

▶ Go to "Check voltagen" procedure.

▶ Repair open in circuit and go to "Verification of Vehicle Repair" procedure.

Check voltage

(1)

IG Key "OFF".

(2)

Disconnect the brake switch connector.

(3)

Measure the voltage between brake lamp switch terminal 2 and chassis ground.

(4)

Measure the voltage between brake switch terminal 4 and chassis ground.

(5)

IG Key "ON".

(6)

Measure the voltage between brake lamp switch terminal 2 and chassis ground.

(7)

Measure the voltage between brake switch terminal 4 and chassis ground.

Specification :

Item	IG "OFF"	IG "ON"
Brake Lamp Switch	Battery voltage	Battery voltage
Brake Switch	0V	BBattery voltage

(8)

Is the measured voltage within specification ?

▶ Substitute with a known - good brake switch and check for proper operation. If the problem is corrected, replace brake switch and go to "Verification of Vehicle Repair" procedure.

▶ Check the fuse between battery and brake switch.

▶ Repair open or short in power circuit of brake switch and go to "Verification of Vehicle Repair" procedure.

VERIFICATION OF VEHICLE REPAIR

Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode

Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions

Read "DTC Status" parameter

Is parameter displayed "History(Not Present) fault"?

▶ System performing to specification at this time. Clear the DTC.

▶ Go to the applicable troubleshooting procedure.