Inspection Procedure

WARNING: This page is about a different variant/trim than selected.

READ VALUE USING DATA LIST

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

Warm up the engine.
Turn the ignition switch off.
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn on the Techstream.
Select the item "Powertrain / Engine and ECT / Data List".
According to the display on the Techstream, read the "Data List".

Standard:

TESTER DISPLAY CHART

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Stop Light Switch	Stop light switch Status/ON or OFF	Brake Pedal is depressed: ON Brake Pedal is released: OFF	-

NOTE: In the table above, the value listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

Result

RESULT CHART

Result	Proceed to
NG	A
OK	B

B: Go to step 3

A: Go to next step

INSPECT STOP LIGHT SWITCH ASSEMBLY

Remove the stop light switch assembly.
Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Switch Position	Specified Condition
1-2	Switch pin free	Below 1 Ω
↑	Switch pin pushed in	10 kΩ or higher
3-4	Switch pin free	10 kΩ or higher
↑	Switch pin pushed in	Below 1 Ω

NG: REPLACE STOP LIGHT SWITCH ASSEMBLY (See STOP LIGHT SWITCH )

Fig 1: Inspecting Stop Light Switch Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM)

Install the stop light switch assembly.
Disconnect the ECM connector.
Measure the voltage according to the value(s) in the table below when the brake pedal is depressed and released.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
A50-36 (STP) - Body ground	Brake pedal Is depressed	11 to 14 V
A50-36 (STP) - Body ground	Brake pedal is released	Below 1 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 2: Identifying ECM A50 Connector Terminals

OK: REPLACE ECM (for 2ZR-FE) (See REMOVAL )