Inspection Procedure

INSPECT ECM (+B VOLTAGE)
1. Turn the ignition switch ON.
2. Measure the voltage of the ECM.
  
  Fig 1: Identifying Connector Terminals ECM
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 2: Terminal Voltage Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )
2. NG: Go to next step.
CHECK WIRE HARNESS (ECM - BODY GROUND)
1. Disconnect the E6 ECM connector.
  
  Fig 3: Disconnecting E6 ECM Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance of the wire harness side connectors.
  Standard:
  
  Fig 4: Resistance Specification Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Reconnect the ECM connector.
1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
2. OK: Go to next step.
INSPECT ECM (IGSW VOLTAGE)
1. Turn the ignition switch ON.
2. Measure the voltage of the ECM connectors.
  
  Fig 5: Identifying Connector Terminals ECM
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 6: Terminal Voltage Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Go to step 6
2. NG: Go to next step.
INSPECT FUSE (IGN)
1. Remove the IGN fuse from the engine room Relay Block (R/B).
  
  Fig 7: Removing IGN Fuse From Engine Room Relay Block (R/B)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance.
  Standard: Below 1 Ω
3. Reinstall the IGN fuse.
1. NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED FUSE
2. OK: Go to next step.
INSPECT IGNITION SWITCH
Measure the resistance of the ignition switch.

Fig 8: Identifying Connector Terminals Ignition Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

Fig 9: Resistance Condition Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPAIR OR REPLACE IGNITION SWITCH
2. OK: Go to next step.
  CHECK AND REPAIR HARNESS AND CONNECTOR (BATTERY - IGNITION SWITCH, IGNITION SWITCH - ECM)
INSPECT ECM (MREL VOLTAGE)
1. Turn the ignition switch ON.
2. Measure the voltage of the ECM.
  
  Fig 10: Identifying Connector Terminals ECM
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 11: Terminal Voltage Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE ECM (SEE REPLACEMENT )
2. OK: Go to next step.
CHECK FUSE (EFI NO. 1)
1. Remove the EFI NO. 1 fuse from the engine room R/B.
  
  Fig 12: Removing EFI No. 1 Fuse From Engine Room R/B
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance.
  Standard: Below 1 Ω
1. NG: REPLACE FUSE (EFI NO. 1)
2. OK: Go to next step.
INSPECT EFI MAIN RELAY
1. Remove the EFI MAIN relay from the engine room R/B.
2. Measure the resistance.
  
  Fig 13: Identifying Connector Terminals EFI
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 14: Resistance Specification Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE EFI MAIN RELAY
2. OK: Go to next step.
CHECK WIRE HARNESS (EFI MAIN RELAY - ECM, EFI MAIN RELAY - BODY GROUND)
1. Check the wire harness between the EFI MAIN relay ECM.
  1. Remove the EFI MAIN relay from the engine room R/B.
    
    Fig 15: Removing EFI Main Relay
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Disconnect the E3 ECM connector.
    
    Fig 16: Disconnecting E3 ECM Connector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Measure the resistance of the wire harness side connectors.
    Standard:
    
    Fig 17: Resistance Specification Chart
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the wire harness between the EFI MAIN relay and the body ground.
  1. Remove the EFI MAIN relay from the engine room R/B.
  2. Measure the resistance of the wire harness side connector.
    Standard:
    
    Fig 18: Resistance Condition Chart
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: CHECK AND REPAIR HARNESS A CONNECTOR (TERMINAL +B OF ECM -BATTERY POSITIVE TERMINAL)
2. OK: Go to next step.
  REPAIR OR REPLACE HARNESS AND CONNECTOR