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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 input signals from brake lamp switch under detecting condition, if the operation state of brake lamp switch does not change for more than 3 sec., PCM sets P0571. 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	● PCM detects brake lamp input signal when vehicle stops.	● Poor connection ● Open or short to ground in signal circuit ● Faulty PCM
Enable Conditions	● Engine works ● Vehicle speed signal is normal. ● Vehicle speed 〉20kph (during 1sec or more)
Threshold value	● Vehicle speed 〈 3kph ● Vehicle acceleration〈 -6kph/s ● Brake lamp "OFF" and not changing of brake lamp signal for more 3 sec.
Diagnosis Time	● Continuous
MIL On Condition	● 2 driving cycles

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

Check voltage

(1)

IG "OFF".

(2)

Disconnect the PCM connector.

(3)

IG "ON" and ENG "OFF"

(4)

During taking off the brake : Measure the voltage between terminal C30-A (23) of PCM harness connector and chassis ground.

(5)

During stepping on the brake : Measure the voltage between terminal C30-A (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

(6)

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 "OFF".

(2)

Disconnect the brake switch and PCM connector.

(3)

Measure the resistance between terminal 23 of PCM harness connector and terminal 2 of Brake switch harness side.

Specification : Approx. below 1Ω

(4)

Is the measured resistance within specification ?

▶ Go to "Check voltage" as follows.

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

Check voltage

(1)

IG "OFF".

(2)

Disconnect the brake switch connector.

(3)

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

(4)

IG "ON" and ENG "OFF"

(5)

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

Specification :

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

(6)

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

After a repair, it is essential to verify that the fault has been corrected.

Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code(DTC) which has been diagnosed.

Using a Scantool, Clear the DTCs

Operate the vehicle within conditions noted in the freeze frame data or enable conditions

Monitor that all rediness test have been verified as " Complete "

Are any DTCs present ?

▶ Go to the applicable troubleshoooting procedure.

▶ System is performing to specification at this time.