Inspection Procedure

HINT:

In case of using the LEXUS hand-held tester, start the inspection from step 1 and in case of not using the LEXUS hand-held tester, start from step  2.

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

   PREPARATION: 

   Connect the LEXUS hand-held tester to the DLC3.

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

      CHECK: 

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

      OK: 

      Brake pedal depressed: ON 

      Brake pedal released: OFF 

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

   CHECK: 

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

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

   PREPARATION: 

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

      CHECK: 

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

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

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      Fig 2: Brake Pedal Position & Voltage Chart

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. OK: Proceed to next circuit inspection shown in problem symptom table (See  PROBLEM SYMPTOMS TABLE   ) 
      2. NG: Go to next step. 
4. Check voltage between terminal ST1- of ECM connector and body ground. 

   PREPARATION: 

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

      CHECK: 

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

      Fig 3: Measuring Voltage Between Terminal ST1- Of ECM Connector & Body Ground

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      Fig 4: Brake Pedal Position & Voltage Chart

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   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: Go to next step. 

      Check and replace ECM (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ).