Inspection Procedure

1. Turn the ignition switch on (IG).
2. Measure the voltage between the terminals of the A24 and B47 ECM connectors.

   Standard voltage 

   TESTER CONNECTIONS AND SPECIFIED CONDITIONS
   
   

   Tester Connections	Specified Conditions
   +B (A24-1) - E1 (B47-1)	9 to 14 V

   Fig 1: Inspecting ECM (+B Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

NG: Go to next step. 

1. Disconnect the B47 ECM connector.
2. Measure the resistance between the terminal of the ECM connector and body ground.

   Standard resistance (Check for open) 

   TESTER CONNECTIONS AND SPECIFIED CONDITIONS
   
   

   Tester Connections	Specified Conditions
   E1 (B47-1) - Body ground	Below 1

3. Reconnect the ECM connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Disconnecting B47 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step. 

1. Turn the ignition switch on (IG).
2. Measure the voltage between the terminals of the A24 and B47 ECM connectors.

   Standard voltage 

   TESTER CONNECTIONS AND SPECIFIED CONDITIONS
   
   

   Tester Connections	Specified Conditions
   IGSW (A24-9) - E1 (B47-1)	9 to 14 V

OK: Go to step   6 

Fig 3: Inspecting ECM (IGSW Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to next step. 

1. Remove the IGN fuse from the instrument panel J/B.
2. Measure the IGN fuse resistance.

   Standard resistance: Below 1  

3. Reinstall the IGN fuse.

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

Fig 4: Checking Fuse

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step. 

1. Inspect the ignition or starter switch assembly (See INSPECTION ).

NG: REPLACE IGNITION OR STARTER SWITCH ASSEMBLY 

OK: Go to next step. 

1. Turn the ignition switch on (IG).
   Fig 5: Inspecting ECM (MREL Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage between the terminals of the A24 and B47 ECM connectors.

   Standard voltage 

   TESTER CONNECTIONS AND SPECIFIED CONDITIONS
   
   

   Tester Connections	Specified Conditions
   MREL (A24-8) - E1 (B47-1)	9 to 14 V

NG: REPLACE ECM 

OK: Go to next step. 

1. Remove the EFI No. 1 fuse from the engine room R/B and J/B.
   Fig 6: Checking Fuse (EFI Fuse)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the EFI No. 1 fuse resistance.

   Standard resistance: Below 1  

3. Reinstall the EFI No. 1 fuse.

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

OK: Go to next step. 

1. Remove the engine room junction block.
   Fig 7: Inspecting Engine Room Junction Block Assembly (EFI Relay)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the EFI relay resistance.

   Standard resistance 

   TESTER CONNECTIONS AND SPECIFIED CONDITIONS
   
   

   Tester Connections	Specified Conditions
   1D-4 - 1D-6	10 k or higher
   1D-4 - 1D-6	Below 1 (when battery voltage applied to terminals 1H-10 and 1H-2)

3. Reinstall the engine room junction block.

NG: REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY 

OK: Go to next step. 

1. Check the harness and connector between the EFI relay and ECM.
   Fig 8: Checking Harness And Connector Between Engine Room Junction Block (EFI Relay) And Body Ground

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Remove the engine room junction block.
   2. Disconnect the A24 ECM connector.
   3. Measure the resistance between the terminals of the ECM connector and engine room junction block (EFI relay).

      Standard resistance (Check for open) 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS
      
      

      Tester Connections	Specified Conditions
      Engine Room Junction Block (EFI relay) (1H-10) - MREL (A24-8)	Below 1

      Standard resistance (Check for short) 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS
      
      

      Tester Connections	Specified Conditions
      Engine Room Junction Block (EFI relay) (1H-10) or MREL (A24-8) - Body ground	10 k or higher

2. Check the harness and connector between the engine room junction block (EFI relay) and body ground.
   1. Measure the resistance between the terminal of the engine room junction block (EFI relay) and body ground.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS
      
      

      Tester Connections	Specified Conditions
      Engine Room Junction Block (EFI relay) (1H-2) - Body ground	Below 1

   2. Reinstall the engine room junction block.
   3. Reconnect the ECM connector.

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

NG: CHECK AND REPLACE HARNESS AND CONNECTOR (TERMINAL +B OF ECM - BATTERY POSITIVE TERMINAL)