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

1. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH) 
   1. Connect the Techstream to the DLC3
   2. Turn the engine switch on (IG) and turn the Techstream ON
   3. Enter the following menus. Powertrain / Engine / Data List / Stop Light Switch
   4. Read the values displayed on the Techstream

      OK 

      NORMAL CONDITION 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 )

2. INSPECT STOP LIGHT SWITCH ASSEMBLY  (See INSPECTION PROCEDURE  )

   NG: REPLACE STOP LIGHT SWITCH ASSEMBLY  (See REMOVAL )

   OK: Go to next step 

3. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM) 
   1. Disconnect the stop light switch connector.
   2. Disconnect the ECM connector
   3. Measure the resistance according to the value(s) in the table below

      Standard Resistance (Check for Short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      A22-1 or A5-13 (STP) - Body ground	Always	10 kΩ or higher
      A22-3 or A5-12 (ST1-) - Body ground	Always

   4. Reconnect the stop light switch connector and ECM connector.
   Fig 1: Identifying Stop Light Switch Connector A22 And ECM Connector A5
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH - ECM) 

   OK: REPLACE ECM  (See REMOVAL )