Inspection Procedure

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

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

      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 discharged or weak.

      OK: Battery is not discharged or weak 

      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 to the engine room relay 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
      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) 
   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) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      ETCS fuse (2) - A37-3 (+BM)	Always	Below 1 Ω

      Standard Resistance (Check for Short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      ETCS fuse (2) or A37-3 (+BM) - Body ground	Always	10 kΩ or higher

   4. Reinstall the ETCS fuse.
   5. Reconnect the ECM connector.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - ETCS FUSE) 

      Fig 2: Identifying ECM Connector And ETCS Fuse

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

6. CHECK HARNESS AND CONNECTOR (BATTERY - ETCS FUSE) 
   1. Disconnect the cable from the negative (-) battery terminal.
   2. Remove the ETCS fuse from the engine room relay block.
   3. Disconnect the cable from the positive (+) battery terminal.
   4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

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

      Standard Resistance (Check for Short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

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

      Fig 3: Identifying ETCS Fuse

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   5. Reinstall the ETCS fuse.
   6. Reconnect the positive (+) cable.
   7. Reconnect the negative (-) cable.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ETCS FUSE) 

      OK: Go to next step 

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

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      A37-3 (+BM) - B29-43 (ME01)	Always	11 to 14 V
      A37-3 (+BM) - B29-104 (E1)

   3. Reconnect the ECM connectors.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND) 

      Fig 4: Identifying ECM Connectors Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: REPLACE ECM  (See REMOVAL )