Inspection Procedure

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Stop Light Switch.

Read the values displayed on the Techstream.

Result

RESULT CHART

Item	Measurement Item: Range (display)	Normal Condition
Stop Light Switch	Stop light switch status: ON or OFF	ON: Brake pedal is depressed OFF: Brake pedal is released

NG: Go to step 2

OK: CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT PROBLEMS )

INSPECT STOP LIGHT SWITCH (See INSPECTION PROCEDURE )
NG: REPLACE STOP LIGHT SWITCH (See STOP LIGHT SWITCH )

OK: Go to next step

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM)

Disconnect the ECM connector.
Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
A37-35 (ST1-) - Body ground	Brake pedal released	11 to 14 V
A37-35 (ST1-) - Body ground	Brake pedal depressed	0 to 3 V
A37-36 (STP) - Body ground	Brake pedal released	0 to 3 V
A37-36 (STP) - Body ground	Brake pedal depressed	11 to 14 V

Reconnect the ECM connector.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH - ECM)

Fig 1: Checking Harness And Connector (Stop Light Switch - ECM)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE ECM (See REMOVAL )