Inspection Procedure

1. READ VALUE USING TECHSTREAM 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the Techstream on.
   4. Enter the following menus: Body Electrical / Main Body / Data List.
   5. Read the display on the Techstream.

   Main Body (Main Body ECU) 

   DATA LIST REFERENCE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   IG SW	Ignition switch IG signal/ON or OFF	ON: Ignition switch ON OFF: Ignition switch off	-

   OK: 

   Normal conditions listed above are displayed. 

   NG: Go to step 2 

   OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE )

2. INSPECT FUSE (ECU-IG NO. 1) 
   1. Remove the ECU-IG No. 1 fuse from the instrument panel junction block.
   2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   ECU-IG No. 1 fuse	Always	Below 1 Ω

   NG: REPLACE FUSE 

   OK: Go to next step 

3. CHECK HARNESS AND CONNECTOR (IG POWER SOURCE CIRCUIT) 
   1. Measure the voltage between the loading slot of the fuse and body ground.

Standard Voltage 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 1: Identifying ECU-IG No. 1 Fuse Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)