Inspection Procedure

HINT:

Read freeze frame data using a 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 a Techstream to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the tester ON.
   4. Select the following menu items: Powertrain / Engine and ECT / Data List / All Data / +BM Voltage.
   5. Read the value displayed on the tester.

      Standard voltage: 

      11 to 14 V 

   NG:  Go to step  4

   OK: Go to next step 

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

      OK: 

      Battery is not depleted 

   NG: REPLACE BATTERY 

   OK: Go to next step 

3. 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  (See CHECK FOR INTERMITTENT PROBLEMS  )

4. CHECK FUSE (ETCS FUSE) 
   1. Remove the ETCS fuse from the engine room relay block.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      ETCS fuse	Always	Below 1 Ω

   3. Reinstall the ETCS fuse from the engine room relay block.

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

   Fig 1: Identifying ETCS Fuse

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to next step 

5. CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE - BATTERY) 
   1. Check the harness and connector between the ETCS fuse and ECM.
      1. Remove the ETCS fuse from the engine room relay block.
      2. Disconnect the ECM connector.
      3. Measure the resistance according to the value(s) in the table below.

         Standard resistance (Check for open) 

         RESISTANCE SPECIFICATION
         
         

         Tester Connection	Condition	Specified Condition
         ETCS fuse (2) - A21-3 (+BM)	Always	Below 1 Ω

         Standard resistance (Check for short) 

         RESISTANCE SPECIFICATION
         
         

         Tester Connection	Condition	Specified Condition
         ETCS fuse (2) or A21-3 (+BM) - Body ground	Always	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 terminal.
      1. Remove the ETCS fuse from the engine room relay block.
      2. Disconnect the cable from the positive (+) battery terminal.
      3. Measure the resistance according to the value(s) in the table below.

         Standard resistance (Check for open) 

         RESISTANCE SPECIFICATION
         
         

         Tester Connection	Condition	Specified Condition
         Positive battery cable - ETCS fuse (1)	Always	Below 1 Ω

         Standard resistance (Check for short) 

         RESISTANCE SPECIFICATION
         
         

         Tester Connection	Condition	Specified Condition
         Positive battery cable or ETCS fuse (1) - Body ground	Always	10 kΩ or higher

         Fig 2: Identifying ETCS Fuse And ECM Connector

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Reinstall the ETCS fuse.
      5. Reconnect the cable.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to next step 

6. INSPECT ECM (+BM VOLTAGE) 
   1. Disconnect the ECM connectors.
   2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      A21-3 (+BM) - C19-43 (ME01)	Always	11 to 14 V
      A21-3 (+BM) - C19-104 (E1)

   3. Reconnect the ECM connectors.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (TERMINALS E1 AND ME01 BODY GROUND) 

   Fig 3: Identifying ECM Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : REPLACE ECM  (See REMOVAL  )