Inspection Procedure

HINT:

• Read freeze frame data using the intelligent tester. Freeze frame data records 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.
• STP signal conditions can be checked using the intelligent tester.
  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch ON.
  3. Turn the tester ON.
  4. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY /STOP LIGHT SW.
  5. Check the STP signal when the brake pedal is depressed and released.

1. CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL B VOLTAGE) 
   1. Disconnect the A3 stop light switch connector.
   2. Turn the ignition switch ON.
   3. Measure the voltage between the terminals of the A3 stop light switch connector and body ground.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connections	Specified Conditions
      A3-2 (B) - Body ground	9 to 14 V
      A3-3 (B) - Body ground	9 to 14 V

   4. Reconnect the stop light switch connector.

   NG: GO to step  4

   Fig 1: Checking Stop Light Switch Assembly (Terminal B Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: GO to next step 

2. INSPECT STOP LIGHT SWITCH ASSEMBLY 
   1. Remove the stop light switch.
   2. Check the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connections	Switch Positions	Specified Conditions
      1-2	Switch pin not pushed	Below 1 Ω
      	Switch pin pushed	10 kΩ or higher
      3-4	Switch pin not pushed	10 kΩ or higher
      	Switch pin pushed	Below 1 Ω

   3. Reinstall the stop light switch.

   NG: REPLACE STOP LIGHT SWITCH ASSEMBLY 

   Fig 2: Identifying Stop Light Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: GO to next step 

3. CHECK ECM (STP AND ST1 - VOLTAGE) 
   1. Disconnect the A9 ECM connector.
   2. Turn the ignition switch ON.
   3. Measure the voltage between the terminals ST1- and STP of the A9 ECM connector and body ground.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connections	Brake Pedal Operations	Specified Conditions
      A9-35 (ST1-) - Body ground	Released	9 to 14 V
      	Depressed	0 to 3 V
      A9-36 (STP) - Body ground	Released	0 to 3 V
      	Depressed	9 to 14 V

   4. Reconnect the ECM connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 3: Checking ECM (STP And ST1 - Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPLACE ECM 

4. INSPECT FUSE (STOP AND IGN FUSE) 
   1. Remove the STOP and IGN fuses from the instrument panel junction block.
   2. Measure the resistance.

      Standard resistance: 

      Below 1 Ω 

   3. Reinstall the STOP and IGN fuses.

   NG: CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

   Fig 4: Inspecting Fuse (Stop And IGN Fuse)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR