Inspection Procedure

HINT:

Read freeze frame data using 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. CHECK FUSE (ETCS FUSE) 
   1. Remove the ETCS fuse from the engine room junction block.
   Fig 1: Identifying Engine Room Junction Block
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance: Below 1 Ω 

   3. Reinstall the ETCS fuse.

   NG: REPLACE FUSE (ETCS FUSE) 

   OK: Go to Next Step 

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

      Standard voltage 

      VOLTAGE SPECIFICATIONS
      
      

      Tester Connection	Specified Condition
      +BM (E4-7) - E1 (E11-1)	9 to 14 V

      Fig 2: Identifying E11 And E4 ECM Connector Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: CHECK FOR INTERMITTENT PROBLEMS 

   NG: Go to Next Step 

3. CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE) 
   1. Check the harness and connector between the ETCS fuse and ECM.
      1. Remove the ETCS fuse from the engine room junction block.
      Fig 3: Identifying ETCS Fuse And Engine Room Junction Block
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Disconnect the E4 ECM connector.
      3. Measure the resistance according to the value(s) in the table below.

         Standard resistance: Check for open 

         RESISTANCE SPECIFIED CONDITIONS
         
         

         Tester Connection	Specified Condition
         ETCS fuse (2) - +BM (E4-7)	Below 1 Ω

         Check for short 

         RESISTANCE SPECIFIED CONDITIONS
         
         

         Tester Connection	Specified Condition
         ETCS fuse (2) or +BM (E4-7) - Body ground	10 kΩ or higher

      4. Reconnect the ECM connector.

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

   OK: Go to Next Step 

4. CHECK HARNESS AND CONNECTOR (ETCS FUSE - BATTERY) 
   1. Check the harness and connector between the ETCS fuse and positive battery cable.
      Fig 4: Identifying ETCS Fuse And Engine Room Junction Block

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the negative battery cable.
      2. Measure the resistance according to the value(s) in the table below.

         Standard resistance: Check for open 

         RESISTANCE SPECIFIED CONDITIONS
         
         

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

         Check for short 

         RESISTANCE SPECIFIED CONDITIONS
         
         

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

      3. Reinstall the ETCS fuse.
      4. Reconnect the negative battery cable.

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

   OK: REPLACE ECM  (See REMOVAL )