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Home >> Scion >> 2004 >> xA Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnosis >> Fuel Pump Control Circuit >> Inspection Procedure >> OBD II scan tool (excluding hand-held tester):

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

  1. CHECK OPERATION OF FUEL PUMP 
    1. Turn the ignition switch ON.
    2. Connect between terminals FC and E01 of the ECM connector.
    3. Check for fuel pressure in the fuel inlet hose when it is pinched off.

      Result: There is pressure in fuel inlet hose. 

      NOTE: At this time, you will hear the fuel flowing sound.
      Fig 1: Checking Operation Of Fuel Pump
      G03367236Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: Checking Fuel Pressure In Fuel Inlet Hose
      G03367237Courtesy 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. 
  2. CHECK ECM POWER SOURCE CIRCUIT (See  ECM POWER SOURCE CIRCUIT  ) 
    1. NG : REPAIR OR REPLACE POWER SOURCE CIRCUIT 
    2. OK : Go to next step. 
  3. INSPECT CIRCUIT OPENING RELAY 
    Fig 3: Inspecting Circuit Opening Relay
    G03367238Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the circuit opening relay from the instrument panel J/B.
    2. Inspect the circuit opening relay.

      Standard: 

      STANDARD

      Tester Connection Specified Condition
      1 - 2 Below 1 Ω
      3 - 5 10 kΩ Or Higher
      Below 1 Ω (Apply Battery Voltage To Terminals 1 & 2)
    3. Reinstall the circuit opening relay.
    1. NG : REPLACE CIRCUIT OPENING RELAY 
    2. OK : Go to next step. 
  4. INSPECT ECM (FC VOLTAGE) 
    Fig 4: Inspecting ECM (FC Voltage)
    G03367239Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the ignition switch ON.
    2. Measure the voltage between the specified terminals of the E3 and E6 ECM connectors.

      Standard: 

      STANDARD

      Tester Connection Specified Condition
      FC (E6-10) - E01 (E3-7) 9 to 14 V
    1. OK : Go to step   7 . 
    2. NG : Go to next step. 
  5. CHECK HARNESS AND CONNECTOR (EFI RELAY - CIRCUIT OPENING RELAY) 
    Fig 5: Checking Harness (EFI Relay - Circuit Opening Relay)
    G03367240Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the EFI relay from the engine room R/B.
    2. Remove the circuit opening relay from the instrument panel J/B.
    3. Measure the resistance between the wire harness side connectors.

      Standard (Check for open): 

      STANDARD (CHECK FOR OPEN)

      Tester Connection Specified Condition
      EFI Relay (3) - Circuit Opening Relay (1) Below 1 Ω
      EFI Relay (3) - Circuit Opening Relay (5)

      Standard (Check for short): 

      STANDARD (CHECK FOR SHORT)

      Tester Connection Specified Condition
      EFI Relay (3) Or Circuit Opening Relay (1) - Body Ground 10 kΩ Or Higher
      EFI Relay (3) Or Circuit Opening Relay (5) - Body Ground
    4. Reinstall the EFI relay.
    5. Reinstall the circuit opening relay.
      Fig 6: Checking Connector (EFI Relay - Circuit Opening Relay)
      G03367241Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : Go to next step. 
  6. CHECK HARNESS AND CONNECTOR (ECM - CIRCUIT OPENING RELAY) 
    Fig 7: Checking Harness (ECM - Circuit Opening Relay)
    G03367242Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E6 ECM connector.
    2. Remove the circuit opening relay from the instrument panel J/B.
    3. Measure the resistance between the wire harness side connectors.

      Standard (Check for open): 

      CHECK HARNESS AND CONNECTOR

      Tester Connection Specified Condition
      FC (E6-10) - Circuit Opening Relay (2) Below 1 Ω

      Standard (Check for short): 

      STANDARD (CHECK FOR SHORT)

      Tester Connection Specified Condition
      FC (E6-10) - Circuit Opening Relay (2) - Body Ground 10 kΩ or higher
    4. Reconnect the ECM connector.
    5. Reinstall the circuit opening relay.
      Fig 8: Checking Connector (ECM - Circuit Opening Relay)
      G03367243Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : REPLACE ECM (See  REPLACEMENT  ) 
  7. INSPECT FUEL PUMP (See  INSPECTION  ) 
    1. NG : REPLACE FUEL PUMP 
    2. OK : Go to next step. 
  8. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND) 
    Fig 9: Checking Harness (Circuit Opening Relay - Fuel Pump, Fuel Pump - Body Ground)
    G03367244Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the circuit opening relay from the instrument panel J/B.
    2. Disconnect the F15 fuel pump connector.
    3. Measure the resistance between the wire harness side connectors.

      Standard (Check for open): 

      STANDARD (CHECK FOR OPEN)

      Tester Connection Specified Condition
      Circuit Opening Relay (3) - Fuel Pump (F15-4) Continuity
      Fuel Pump (F15-5) - Body Ground

      Standard (Check for short): 

      STANDARD (CHECK FOR SHORT)

      Tester Connection Specified Condition
      Circuit Opening Relay (3) Or Fuel Pump (F15-4) - Body Ground 10 kΩ or higher
    4. Reconnect the fuel pump connector.
    5. Reinstall the circuit opening relay.
      Fig 10: Checking Connector (Circuit Opening Relay - Fuel Pump, Fuel Pump - Body Ground)
      G03367245Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : REPLACE ECM (See  REPLACEMENT  ) 
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