OBD II scan tool (excluding hand-held tester):

CHECK FUEL PUMP OPERATION (See ON-VEHICLE INSPECTION )
1. Check if there is pressure in the fuel inlet hose.
HINT:

If there is fuel pressure, you will hear fuel flowing sound.

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

NG: GO TO NEXT STEP.
CHECK RELAY OPERATION (CIRCUIT OPENING RELAY)
1. Turn the ignition switch to ON.
2. Connect terminal FC of the ECM connector and the body ground, check the relay operation.
  Standard:
  
  Operating sound can be heard from the circuit opening relay.
  
  Fig 1: Identifying ECM Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: Go to step 6

NG: GO TO NEXT STEP.
INSPECT CIRCUIT OPENING RELAY
1. Remove the circuit opening relay from the engine room J/B.
2. Check for continuity in the circuit opening relay.
  Standard:
  
  Fig 2: Circuit Opening Relay Connector Terminals Continuity Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Reinstall the circuit opening relay.
  
  Fig 3: Checking Continuity Between Circuit Opening Relay Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE CIRCUIT OPENING RELAY

OK: GO TO NEXT STEP.
INSPECT ECM (FC VOLTAGE)
1. Turn the ignition switch to ON.
2. Measure the voltage between the specified terminals of the E6 and E8 ECM connectors.
  Standard:
  
  Fig 4: ECM Connector Terminals Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 5: Identifying ECM Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPLACE ECM (See ECM (3MZ-FE) )

NG: GO TO NEXT STEP.
CHECK HARNESS AND CONNECTOR (ECM - CIRCUIT OPENING RELAY, CIRCUIT OPENING RELAY - IGNITION SWITCH)
1. Check the harness and the connector between the fuel pump connector and the circuit opening relay.
  1. Disconnect the E6 ECM connector.
  2. Remove the circuit opening relay from the engine room J/B.
  3. Check the resistance between the wire harness side connectors.
    Standard (Check for open):
    
    Fig 6: ECM And Circuit Opening Relay Terminals Specified Condition Chart (Check For Open)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard (Check for short):
    
    Fig 7: ECM And Circuit Opening Relay Terminals Specified Condition Chart (Check For Short)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Reconnect the ECM connector.
  5. Reinstall the circuit opening relay.
    
    Fig 8: Disconnecting E6 ECM Connector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 9: Identifying Circuit Opening Relay Terminals And IGN Fuse
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the harness and the connector between the circuit opening relay and the I14 ignition switch connector.
  1. Inspect the IG2 fuse.
    - Remove the IG2 fuse from the engine room J/B.
    - Check for continuity in the IG2 fuse.
      Standard: Continuity
    - Reinstall the IG2 fuse.
  2. Remove the circuit opening relay from the engine room J/B.
  3. Disconnect the I14 ignition switch connector.
  4. Check the resistance between the wire harness side connectors.
    Standard (Check for open):
    
    Fig 10: Circuit Opening Relay And Ignition Switch Connector Terminals Specified Condition Chart (Check For Open)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard (Check for short):
    
    Fig 11: Circuit Opening Relay And Ignition Switch Connector Terminals Specified Condition Chart (Check For Short)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Reinstall the circuit opening relay.
  6. Reconnect the ignition switch connector.
    
    Fig 12: Identifying Ignition Switch Connector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE ECM (See ECM (3MZ-FE) )
INSPECT FUEL PUMP
1. Inspect fuel pump resistance.
  1. Measure the resistance between terminals 4 and 5.
    Standard: 0.2 to 3.0 Ω at 20°C (68°F)
2. Inspect fuel pump operation
  1. Apply battery voltage to both the terminals. Check that the pump operates.
NOTE:
- These tests must be done quickly (within 10 seconds) to prevent the coil from burning out.
- Keep fuel pump as far away from the battery as possible.
- Always do the switching at the battery side.
Fig 13: Identifying Fuel Pump Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE FUEL PUMP (See FUEL SUCTION W/PUMP & GAUGE TUBE ASSY (3MZ-F )

OK: GO TO NEXT STEP.
CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND)
1. Check the harness and the connector between the circuit opening relay and the fuel pump connector.
  1. Remove the circuit opening relay from the engine room J/B.
  2. Disconnect the F15 fuel pump connector.
  3. Check the resistance between the wire harness side connectors.
    Standard (Check for open):
    
    Fig 14: Circuit Opening Relay And Fuel Pump Connector Terminals Specified Condition Chart (Check For Open)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard (Check for short):
    
    Fig 15: Fuel Pump And Body Ground Terminals Specified Condition Chart (Check For Short)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Reinstall the circuit opening relay.
  5. Reconnect the fuel pump connector.
    
    Fig 16: Identifying Circuit Opening Relay
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the harness and the connector between the fuel pump connector and the body ground.
  1. Disconnect the F15 fuel pump connector.
  2. Check the resistance between the wire harness side connectors and body ground.
    Standard (Check for open):
    
    Fig 17: Fuel Pump And Body Ground Terminals Specified Condition Chart (Check For Open)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Reconnect the fuel pump connector.
    
    Fig 18: Identifying Fuel Pump Connector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE ECM (See ECM (3MZ-FE) )