Inspection Procedure

HINT:

Read freeze frame data using an intelligent tester or OBD II scan tool. 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) 
   1. Remove the ETCS fuse from the engine room R/B.
   2. Check the ETCS fuse resistance.

      Standard resistance: 

      Below 1 Ω 

   3. Reinstall the ETCS fuse.

   NG: REPLACE FUSE 

   Fig 1: Checking Fuse (ETCS)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : Go to Next Step 

2. INSPECT ECM (+BM VOLTAGE) 
   1. Measure the voltage between the terminals of the E3 and E5 ECM connectors.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATIONS
      
      

      Tester Connections	Specified Conditions
      +BM (E5-6) - E1 (E3-5)	Between 9 V and 14 V

   OK : CHECK FOR INTERMITTENT PROBLEMS 

   Fig 2: Inspecting ECM (+BM Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to Next Step 

3. CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY) 
   1. Check the harness and connector between the ETCS fuse and ECM.
      1. Remove the ETCS fuse from the engine room R/B.
      2. Disconnect the E5 ECM connector.
      3. Check the resistance.

         Standard resistance (Check for open) 

         STANDARD RESISTANCE SPECIFICATIONS FOR OPEN
         
         

         Tester Connections	Specified Conditions
         ETCS fuse (2) - +BM (E5-6)	Below 1 Ω

         Standard resistance (Check for short) 

         STANDARD RESISTANCE SPECIFICATIONS (FOR SHORT)
         
         

         Tester Connections	Specified Conditions
         ETCS fuse (2) or +BM (E5-6) - 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 R/B.
      2. Disconnect the positive battery cable.
      3. Check the resistance.

         Standard resistance (Check for open) 

         Fig 3: Checking Harness And Connector (ECM - ETCS Fuse, ETCS Fuse - Battery)

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
         STANDARD RESISTANCE SPECIFICATIONS FOR OPEN
         
         

         Tester Connections	Specified Conditions
         Positive battery cable terminal - ETCS fuse (1)	Below 1 Ω

         Standard resistance (Check for short) 

         STANDARD RESISTANCE SPECIFICATIONS (FOR SHORT)
         
         

         Tester Connections	Specified Conditions
         Positive battery cable terminal or ETCS fuse (1) - Body ground	10 kΩ or higher

      4. Reinstall the ETCS fuse.
      5. Reconnect the positive battery cable.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : REPLACE ECM