Inspection Procedure

1. Turn the engine switch on (IG).
2. Measure the voltage according to the value (s) in the table below.

   Standard voltage 

   STANDARD VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   A13-2 (+B) - E3-1 (E1)	Engine switch on (IG)	11 to 14 V
   A13-1 (+B2) - E3-1 (E1)	Engine switch on (IG)	11 to 14 V

Fig 1: Identifying ECM (+B, +B2 Voltage)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

1. Disconnect the E3 ECM connector.
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance (Check for open) 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   E3-1 (E1) - Body ground	Always	Below 1 Ω

Fig 2: Identifying Terminal E1 Of E3 ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Turn the engine switch on (IG).
2. Measure the voltage according to the value (s) in the table below.

   Standard voltage 

   STANDARD VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   A14-8 (IGSW) - E3-1 (E1)	Engine switch on (IG)	11 to 14 V

Fig 3: Identifying ECM (IGSW Voltage)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:  Go to step  6

NG: Go to Next Step 

1. Remove the ECU-IG fuse from the engine room No. 2 junction block.
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   ECU-IG	Always	Below 1 Ω

Fig 4: Identifying ECU-IG Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK: Go to Next Step 

1. Remove the IG2 relay from the engine room No. 2 junction block.
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   3-5	When no battery voltage applied to terminals 1 and 2	10 kΩ or higher
   3-5	When battery voltage applied to terminals 1 and 2	Below 1 Ω

Fig 5: Inspecting Ignition Relay No. 2 (IG2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE IGNITION RELAY NO. 2 (IG2)  (See IGNITION RELAY NO. 2 )

OK: GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START  (See POWER SOURCE MODE DOES NOT CHANGE )

1. Turn the engine switch on (IG).
2. Measure the voltage according to the value (s) in the table below.

   Standard voltage 

   STANDARD VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   A14-3 (MREL) - E3-1 (E1)	Engine switch on (IG)	9 to 14 V

Fig 6: Identifying ECM (MREL Voltage)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE ECM  (See REMOVAL )

OK: Go to Next Step 

1. Remove the EFI MAIN2 fuse from the engine room No. 2 relay block.
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   EFI MAIN2	Always	Below 1 Ω

Fig 7: Identifying EFI MAIN2 Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK: Go to Next Step 

1. Remove the EFI MAIN2 relay from the engine room No. 2 relay block.
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   3-5	When no battery voltage applied to terminals 1 and 2	10 kΩ or higher
   	When battery voltage applied to terminals 1 and 2	Below 1 Ω

Fig 8: Inspecting EFI Relay (EFI MAIN2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE EFI RELAY (EFI MAIN2)  (See EFI RELAY )

OK: Go to Next Step 

1. Check the harness and the connectors between the integration relay and the ECM.
   1. Remove the EFI MAIN2 relay from the engine room No. 2 relay block.
   2. Disconnect the A14 ECM connector.
   3. Measure the resistance according to the value (s) in the table below.

      Standard resistance (Check for open) 

      STANDARD RESISTANCE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      EFI MAIN2 relay (1) - A14-3 (MREL)	Always	Below 1 Ω

      Standard resistance (Check for short) 

      STANDARD RESISTANCE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      EFI MAIN2 relay (1) or A14-3 (MREL) - Body ground	Always	10 kΩ or higher

2. Check the harness and the connectors between the EFI MAIN2 relay and body ground.
   1. Remove the EFI MAIN2 relay from the engine room No. 2 relay block.
   2. Measure the resistance according to the value (s) in the table below.
      Fig 9: Identifying EFI MAIN2 Relay And a14 ECM Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance (Check for open) 

      STANDARD RESISTANCE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      EFI MAIN2 relay (2) - Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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