Inspection Procedure

1. If there is a malfunction in the stop light switch or STOP fuse, their signals may not be correctly transmitted to the main body ECU. This may result in the engine not starting even if the engine switch is pressed while the brake pedal is depressed and the shift lever is in the P position. To activate the starter:
   1. Turn the engine switch from off to on (ACC).
   2. Press and hold the engine switch for 15 seconds.

      HINT:

      Before performing the inspection, depress the brake pedal and check that the stop lights come on. If the stop lights do not come on when the brake pedal is depressed, refer to the page shown in the brackets (See PROBLEM SYMPTOMS TABLE ).

1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG).
3. Check the DATA LIST for proper functioning of the stop light switch.

   MAIN BODY: 

   DATA LIST (MAIN BODY)
   
   

   Item	Measurement Item/Display (Range)	Normal Condition	Diagnostic Note
   STOP LIGHT SW	Stop light switch/ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

   OK: ON (brake pedal depressed) and OFF (brake pedal released) appear on the screen. 

NG: Go to step  4

OK: Go to Next Step 

1. Delete the DTCs (See DTC CHECK / CLEAR  ).
2. Check for CAN communication system DTCs (See DIAGNOSTIC TROUBLE CODE CHART ).

   HINT:

   If the DTCs for the CAN communication system malfunction are output, inspect those DTCs first.

   OK: No DTC is output. 

NG: GO TO   1 CAN COMMUNICATION SYSTEM 

OK: Go to Next Step 

1. Delete the DTCs (See DTC CHECK/CLEAR ).
2. Check for DTC P0500 (Vehicle speed sensor A) (See DIAGNOSTIC TROUBLE CODE CHART ).

   OK: No DTC is output. 

NG: GO TO ENGINE CONTROL SYSTEM 

OK: REPLACE MAIN BODY ECU 

1. Remove the STOP fuse from the instrument panel J/B.
2. Measure the resistance of the fuse.

   Standard resistance: Below 1 Ω 

NG: REPLACE FUSE 

OK: Go to Next Step 

1. Disconnect the DC ECU connector.
2. Measure the volage according to the value(s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   DC-13 - Body ground	Brake pedal released	Below 1 V
   DC-13 - Body ground	Brake pedal depressed	10 to 14 V

Fig 1: Identifying Main Body ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

NG: Go to Next Step 

1. Remove the switch.
2. Measure the resistance of the switch.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   1 - 2	Switch pin free	Below 1 Ω
   3 - 4	Switch pin free	10 kΩ or higher
   1 - 2	Switch pin pushed in	10 kΩ or higher
   3 - 4	Switch pin pushed in	Below 1 Ω

Fig 2: Inspecting Stop Light Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STOP LIGHT SWITCH 

OK: REPLACE MAIN BODY ECU