Inspection Procedure

HINT:

Read freeze frame data using OBD II scan tool or hand-held tester. Because freeze frame records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

1. Check operation of stop light. 

   CHECK: 

   Check if the stop lights go on and off normally when the brake pedal is operated and released.

   1. NG: Check and repair stop light circuit (See  PROCEDURE  ). 
   2. OK: Go to next step. 
2. Check STP signal. 

   When 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.
      Fig 1: Checking STP Signal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   CHECK: 

   Read the STP signal on the hand-held tester.

   OK: 

   DTC CHART
   
   

   Brake Pedal	STP Signal
   Depressed	ON
   Released	OFF

   When not using hand-held tester: 

   PREPARATION: 

   Turn the ignition switch ON.

   CHECK: 

   Check the voltage between terminal STP of the ECM connector and body ground.

   OK: 

   VOLTAGE SPECIFICATION
   
   

   Brake Pedal	Voltage
   Depressed	7.5 - 14 V
   Released	Below 1.5 V

   1. OK: Check for intermittent problems (See  PRE-CHECK  ). 
   2. NG: Go to next step. 
3. Check harness and connector between ECM and stop light switch (See  PROCEDURE  ). 
   1. NG: Repair or replace harness or connector. 
   2. OK: Check and replace ECM (See  PROCEDURE  ).