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 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 the Techstream to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the Techstream on.
   4. Enter the following menus: Powertrain/Engine/Data List/All Data/+BM Voltage.
   5. Read the value displayed on the Techstream.

      Standard voltage: 

      11 to 14 V 

      NG: Go to step 2 

      OK: CHECK FOR INTERMITTENT PROBLEMS  (See CHECK FOR INTERMITTENT PROBLEMS )

2. CHECK HARNESS AND CONNECTOR (BATTERY - ECM, ECM - BODY GROUND) 
   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
      D61-22 (+BM) - Body ground	Always	11 to 14 V

   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
      B48-20 (ME01) - Body ground	Always	Below 1 Ω
      B49-6 (E1) - Body ground	Always	Below 1 Ω

   4. Reconnect the ECM connectors.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      Fig 1: Disconnecting ECM Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: REPLACE ECM  (See REMOVAL )