Inspection Procedure

1. Disconnect the E4 and E8 ECM connectors.
2. Turn the ignition switch to the ON position.
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   ECM TESTER CONNECTION AND SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   +B (E4-1) - E1 (E8-3)	9 to 14 V

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

Fig 1: Disconnecting E4 And E8 ECM Connectors

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NG: GO TO NEXT STEP 

1. Disconnect the negative battery cable.
2. Disconnect the E8 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   WIRE HARNESS TESTER CONNECTION AND SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   E1 (E8-3) - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Disconnecting E8 ECM Connector

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OK: GO TO NEXT STEP 

1. Disconnect the E4 and E8 ECM connectors.
2. Turn the ignition switch to the ON position.
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   ECM TESTER CONNECTION AND SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   IGSW (E4-9) - E1 (E8-3)	9 to 14 V

OK: Go to step   6 

Fig 3: Inspecting ECM (IGSW Voltage)

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NG: GO TO NEXT STEP 

1. Remove the AM2 fuse from the engine room relay block.
2. Measure the resistance of the AM2 fuse.

   Standard resistance: 

   Below 1 Ω 

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

Fig 4: Identifying AM2 Fuse

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OK: GO TO NEXT STEP 

1. Disconnect the 15 ignition switch connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   IGNITION SWITCH ASSEMBLY TESTER CONNECTION AND SPECIFIED CONDITION
   
   

   Switch Position	Tester Connection	Specified Condition
   LOCK	All Terminals	10 kΩ or higher
   ON	IG2 (6) - AM2 (7)	Below 1 Ω

NG: REPLACE IGNITION SWITCH ASSEMBLY 

Fig 5: Identifying Ignition Switch Connector Terminals

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OK: CHECK AND REPLACE HARNESS AND CONNECTOR (BATTERY - IGNITION SWITCH, IGNITION SWITCH - ECM) 

1. Turn the ignition switch to the ON position.
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   ECM TESTER CONNECTION AND SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   MREL (E4-8) - E1 (E8-3)	9 to 14 V

NG: REPLACE ECM 

Fig 6: Inspecting ECM (MREL Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO NEXT STEP 

1. Remove the EFI fuse from the engine room relay block.
2. Measure the resistance of the EFI fuse.

   Standard resistance: 

   Below 1 Ω 

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

Fig 7: Identifying EFI Fuse

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OK: GO TO NEXT STEP 

1. Remove the EFI relay from the engine room relay block.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   EFI RELAY TESTER CONNECTION AND 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)

NG: REPLACE EFI RELAY 

Fig 8: Identifying EFI Relay Connector Terminals

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OK: GO TO NEXT STEP 

1. Check the wire harness between the EFI relay and ECM.
   1. Remove the EFI relay from the engine room relay block.
   2. Disconnect the E4 ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      WIRE HARNESS TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      Engine room relay block (EFI relay terminal 1) -MREL (E4-8)	Below 1 Ω
      Engine room relay block (EFI relay terminal 3) -+B (E4-1)	Below 1 Ω
      Engine room relay block (EFI relay terminal 1) or MREL (E4-8) - Body ground	10 kΩ or higher
      Engine room relay block (EFI relay terminal 3) or +B (E4-1) - Body ground	10 kΩ or higher

2. Check the wire harness between the EFI relay and body ground.
   1. Remove the EFI relay from the engine room relay block.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      WIRE HARNESS TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      Engine room relay block (EFI relay terminal 2) -Body ground	Below 1 Ω

   3. Reinstall the EFI relay.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 9: Disconnecting E4 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: CHECK AND REPAIR HARNESS AND CONNECTOR (TERMINAL 5 OF EFI RELAY - BATTERY POSITIVE TERMINAL)