Inspection Procedure

1. Turn the engine switch on (IG).
2. Measure the voltage of the ECM connectors.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   A6-6 (+B) - E7-7 (E1)	9 to 14 V
   A6-5 (+B1) - E7-7 (E1)	9 to 14 V

Fig 1: Checking ECM (+B, +B1 Voltage)

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OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

NG: Go to next step 

1. Disconnect the E7 ECM connector.
2. Measure the resistance of the wire harness side connector.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   E7-7 (E1) - Body ground	Below 1 Ω

Fig 2: Disconnecting E7 ECM Connector

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NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to next step 

1. Turn the engine switch on (IG).
2. Measure the voltage of the ECM connectors.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   A6-17 (IGSW) - E7-7 (E1)	9 to 14 V

Fig 3: Checking ECM (IGSW Voltage)

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OK:  Go to step  6

NG: Go to next step 

1. Remove the IGN fuse from the body ECU.
2. Measure the resistance of the IGN fuse.

   Standard resistance: 

   Below 1 Ω 

Fig 4: Identifying IGN Fuse

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NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE, AND REPLACE FUSE 

OK: Go to next step 

1. Remove the IG2 relay from engine room No. 2 relay block.
2. Measure the resistance of the IG2 relay.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

Fig 5: Identifying IG2 Relay

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NG: REPLACE RELAY 

OK: PUSH BUTTON START SYSTEM 

1. Turn the engine switch on (IG).
2. Measure the voltage of the ECM connectors.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   A6-13 (MREL) - E7-7 (E1)	9 to 14 V

Fig 6: Checking ECM (MREL Voltage)

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NG: REPLACE ECM 

OK: Go to next step 

1. Remove the EFI fuse from the engine room No. 2 relay block.
2. Measure the resistance of the EFI fuse.

   Standard resistance: 

   Below 1 Ω 

Fig 7: Identifying EFI Fuse

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NG: CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED FUSE, AND REPLACE FUSE 

OK: Go to next step 

1. Remove the integration relay from the engine room No. 2 junction block.
2. Measure the resistance of the EFI MAIN relay.

   Standard resistance 

   TERMINAL CONNECTIONS SPECIFIED CONDITION CHART
   
   

   Terminal Connections	Specified Condition
   2A-8 - 2C-1	10 kΩ or higher
   2A-8 - 2C-1	Below 1 Ω (when battery voltage is applied to terminals 2A-6 and 2A-7)

Fig 8: Identifying Integration Relay

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NG: REPLACE INTEGRATION RELAY 

OK: Go to next step 

1. Check the wire harness between the integration relay and the ECM.
   1. Remove the integration relay from the engine room No. 2 junction block.
   2. Disconnect the A6 ECM connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      2A-6 - A6-13 (MREL)	Below 1 Ω
      2A-6 or A6-13 (MREL) - Body ground	10 kΩ or higher

2. Check the wire harness between the integration relay and body ground.
   1. Remove the integration relay from the engine room No. 2 junction block.
   2. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      2A-7 - Body ground	Below 1 Ω

Fig 9: Checking Wire Harness (Integration Relay - ECM, Integration Relay - Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: REPAIR OR REPLACE HARNESS AND CONNECTOR (TERMINAL +B OF ECM - POSITIVE BATTERY (+) TERMINAL)