Inspection Procedure

HINT:

Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

1. READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SW) 
   1. Connect an intelligent tester to the DLC3.
   2. Turn the ignition switch to ON and turn the tester ON.
   3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / STOP LIGHT SW.
   4. Read the values displayed on the tester.

      OK 

      DISPLAY REFERENCE
      
      

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

   OK: CHECK FOR INTERMITTENT PROBLEMS 

   NG: GO TO NEXT STEP 

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

   NG: REPLACE STOP LIGHT SWITCH ASSEMBLY 

3. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM) 
   1. Disconnect the A21 ECM connector.
   2. Disconnect the A13 stop light switch connector.
   3. Check the resistance.

      Standard resistance (Check for open) 

      RESISTANCE SPECIFICATION
      
      

      Tester Connections	Specified Conditions
      STP (A21-36) - Stop light switch (A13-1)	Below 1 Ω
      ST1- (A21-35) - Stop light switch (A13-4)

      Standard resistance (Check for short) 

      RESISTANCE SPECIFICATION
      
      

      Tester Connections	Specified Conditions
      STP (A21-36) or Stop light switch (A13-1) - Body ground	10 kΩ or higher
      ST1- (A21-35) or Stop light switch (A13-4) - Body ground

   4. Reconnect the ECM connector.
   5. Reconnect the stop light switch connector.
      Fig 1: Identifying Stop Light Switch & ECM Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM