Inspection Procedure

HINT:

When using the hand-held tester, start the inspection from step 1. Otherwise, start from step  2.

1. Check stop light switch using hand-held tester. 

   PREPARATION: 

   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch ON and push the hand-held tester main switch ON.

      CHECK: 

      Select the item "STOP LIGHT SW" in the DATA LIST and read the displayed value.

      OK: 

      ON: Brake pedal depressed 

      OFF: Brake pedal released 

   1. OK : Proceed to next circuit inspection shown in problem symptoms table (See  PROBLEM SYMPTOMS TABLE   ). 
   2. NG : Go to next step. 
2. Check operation of stop light. 

   CHECK: 

   Check that the stop light turns on when the brake pedal is depressed, and turns off when the brake pedal is released.

   1. NG : Check stop light system (See  INSPECTION  ). 
   2. OK : Go to next step. 
3. Measure voltage between terminal STP of ECM connector and body ground. 

   PREPARATION: 

   1. Remove the ECM with the connectors being connected.
   2. Turn the ignition switch ON.

      CHECK: 

      Measure the voltage between terminal STP of the ECM connector and body ground when the brake pedal is depressed and released.

      Fig 1: Measuring Voltage Between Terminal STP Of ECM Connector And Body Ground

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      BRAKE PEDAL CONDITION
      
      

      Brake Pedal Condition	Specified Condition
      Depressed	10 to 14V
      Released	Below 1 V

   1. OK : Proceed to next circuit inspection shown in problem symptoms table (See  PROBLEM SYMPTOMS TABLE   ). 
   2. NG : Go to next step. 
4. Measure voltage between terminal ST1- of ECM connector and body ground. 

   PREPARATION: 

   1. Remove the ECM with the connectors being connected.
   2. Turn the ignition switch ON.

      CHECK: 

      Measure the voltage between terminal ST1- of the ECM connector and body ground when the brake pedal is depressed and released.

      Fig 2: Measuring Voltage Between Terminal ST1- Of ECM Connector And Body Ground

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      BRAKE PEDAL CONDITION
      
      

      Brake Pedal Condition	Specified Condition
      Depressed	Below 1 V
      Released	10 to 14V

   1. OK : Proceed to next circuit inspection shown in problem symptoms table (See  PROBLEM SYMPTOMS TABLE   ). 
   2. NG : Go to next step. 
5. Check wire harness and connector between terminal STP of ECM and stop light switch, and terminal ST1- of ECM and stop light switch (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   1. NG : Repair or replace harness or connector. 
   2. OK : Check and replace ECM (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ).