Inspection Procedure

HINT:

Read freeze frame data using Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1. READ VALUE USING TECHSTREAM (+BM VOLTAGE) 
   1. Connect Techstream to the DLC3.
   2. Turn the ignition switch ON.
   3. Turn the tester ON.
   4. Select the following menu items: Powertrain / Engine and ECT / Data List / +BM Voltage.
   5. Read the value displayed on the tester.

      Standard voltage: 

      9 to 14 V 

   OK:  Go to step  5

   NG: Go to next step 

2. CHECK FUSE (ETCS FUSE) 
   1. Remove the ETCS fuse from the engine room No. 1 relay block.
   Fig 1: Identifying ETCS Fuse
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Measure the ETCS fuse resistance.

      Standard resistance: 

      Below 1 Ω 

   3. Reinstall the ETCS fuse.

   NG: CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

   OK: Go to next step 

3. CHECK WIRE HARNESS (ECM - ETCS FUSE, ETCS FUSE - BATTERY) 
   Fig 2: Identifying Wire Harness (ECM - ETCS Fuse, ETCS Fuse - Battery)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Check the harness and connector between the ETCS fuse and ECM.
      1. Remove the ETCS fuse from the engine room No. 1 relay block.
      2. Disconnect the A9 ECM connector.
      3. Measure the resistance.

         Standard resistance 

         TESTER CONNECTION SPECIFIED CONDITION CHART
         
         

         Tester Connection	Specified Condition
         ETCS fuse terminal 2 - A9-3 (+BM)	Below 1 Ω
         ETCS fuse terminal 2 or A9-3 (+BM) -Body ground	10 kΩ or higher

      4. Reinstall the ETCS fuse.
      5. Reconnect the ECM connector.
   2. Check the harness and connector between the ETCS fuse and positive battery cable.
      1. Remove the ETCS fuse from the engine room No. 1 relay block.
      2. Disconnect the cable from the positive (+) battery terminal.
      3. Check the resistance.

         Standard resistance 

         TESTER CONNECTION SPECIFIED CONDITION CHART
         
         

         Tester Connection	Specified Condition
         Positive battery cable - ETCS fuse terminal 1	Below 1 Ω
         Positive battery cable or ETCS fuse terminal 1 - Body ground	10 kΩ or higher

      4. Reinstall the ETCS fuse.
      5. Reconnect the cable to the positive (+) battery terminal.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to next step 

4. INSPECT ECM (+BM VOLTAGE) 
   Fig 3: Identifying ECM (+BM Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the A9 and B30 ECM connectors.
   2. Measure the voltage between the terminals of the A9 and B30 ECM connectors.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      A9-3 (+BM) - B30-81 (E1)	9 to 14 V

   3. Reconnect the ECM connectors.

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR (TERMINAL E1 - BODY GROUND) 

   OK: REPLACE ECM 

5. INSPECT BATTERY 
   1. Check that the battery is not depleted.

      OK: 

      Battery is not depleted 

   NG: REPLACE BATTERY 

   OK: Go to next step 

6. CHECK BATTERY TERMINAL 
   1. Check that the battery terminals and ECM ground are not loose or corroded.

      OK: 

      Battery terminals and ECM ground are not loose or corroded 

   NG: REPAIR OR REPLACE BATTERY TERMINAL 

   OK: CHECK FOR INTERMITTENT PROBLEMS