Inspection Procedure

1. Turn the ignition switch to ON.
2. Measure the voltage between the terminals of the E4 and E6 ECM connectors.

Standard: 

Fig 1: Inspecting ECM (+B Voltage)

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

NG: Go to next step. 

1. Disconnect the negative battery cable.
2. Disconnect the E4 ECM connector.
3. Check the resistance.

   Standard (Check for open): 

   TESTER CONNECTIONS SPECIFIED CONDITION (FOR OPEN)
   
   

   Tester Connections	Specified Conditions
   E1 (E4-7) - Body ground	Below 1Ω

4. Reconnect the ECM connector.
5. Reconnect the negative battery cable.

Fig 2: Disconnecting E4 ECM Connector

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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step. 

1. Turn the ignition switch to ON.
2. Measure the voltage between the terminals of the E4 and E6 ECM connectors.

Standard: 

Fig 3: Inspecting ECM (IGSW Voltage)

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OK: Go to step   6 

NG: Go to next step. 

1. Remove the AM2 fuse from the instrument panel J/B.
2. Check the AM2 fuse resistance.

   Standard: Below 1 Ω 

3. Reinstall the AM2 fuse.

Fig 4: Removing AM2 Fuse From Instrument Panel J/B

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

OK: Go to next step. 

1. Disconnect the I11 ignition switch connector.
2. Check the resistance.

   Standard: 

   TESTER CONNECTIONS SPECIFIED CONDITION (2 OF 4)
   
   

   Ignition Switch Positions	Tester Connections	Specified Conditions
   LOCK	All Terminals	10 kΩ or higher
   ACC	1-3	Below 1Ω
   ON	1-2, 1-3, 2-3, 5-6	Below 1Ω
   START	1-2, 4-5, 4-6, 5-6	Below 1Ω

3. Reconnect the ignition switch connector.

Fig 5: Identifying I11 Ignition Switch Connector

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NG: REPLACE IGNITION OR STARTER SWITCH ASSY 

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

1. Turn the ignition switch to ON.
2. Measure the voltage between the terminals of the E4 and E6 ECM connectors.

Standard: 

Fig 6: Inspecting ECM (MREL Voltage)

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NG: REPLACE ECM (See  REPLACEMENT  ) 

OK: Go to next step. 

1. Remove the EFI fuse from the engine room R/B.
2. Check the EFI fuse resistance.

   Standard: Below 1Ω 

3. Reinstall the EFI fuse.

Fig 7: Removing EFI Fuse From Engine Room R/B

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

OK: Go to next step. 

1. Remove the EFI relay from the engine room R/B.
2. Check the EFI relay resistance.

   Standard: 

   TESTER CONNECTIONS SPECIFIED CONDITION (4 OF 4)
   
   

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

3. Reinstall the EFI relay.

Fig 8: Inspecting EFI Relay

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NG: REPLACE EFI RELAY 

OK: Go to next step. 

1. Check the harness and connector between the EFI relay and ECM.
   1. Remove the EFI relay from the engine room R/B.
   2. Disconnect the E6 ECM connector.
   3. Check the resistance.
      Fig 9: Removing EFI Relay From Engine Room R/B

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for open): 

      TESTER CONNECTIONS SPECIFIED CONDITION (FOR OPEN)
      
      

      Tester Connections	Specified Conditions
      Engine room R/B (EFI relay terminal 1) - MREL (E6-8)	Below 1Ω
      Engine room R/B (EFI relay terminal 3) - +B (E6-1)	Below 1Ω

      Standard (Check for short): 

      TESTER CONNECTIONS SPECIFIED CONDITION (FOR SHORT)
      
      

      Tester Connections	Specified Conditions
      Engine room R/B (EFI relay terminal 1) or MREL (E6-8) - Body ground	10 kΩ or higher
      Engine room R/B (EFI relay terminal 3) or +B (E6-1) - Body ground	10 kΩ or higher

   4. Reconnect the ECM connector.
   5. Reinstall the EFI relay.
2. Check the harness and connector between the EFI relay and body ground.
   1. Remove the EFI relay from the engine room R/B.
   2. Check the resistance.

      Standard (Check for open): 

      TESTER CONNECTIONS SPECIFIED CONDITION (FOR OPEN)
      
      

      Tester Connections	Specified Conditions
      Engine room R/B (EFI relay terminal 2) - Body ground	Below 1Ω

   3. Reinstall the EFI relay.

Fig 10: Disconnecting E6 ECM Connector

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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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