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Last Modified:?3-8-2013 6.4 JDoc ID:?RM0000030MH01SX Model Year:?2011 Model:?Tundra Prod Date Range:?[08/2010 - ? ? ? ? ? ] Title:?3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: Fuel Pump Control Circuit; 2011 MY Tundra [08/2010 - ???????] Fuel Pump Control CircuitDESCRIPTIONThe fuel pump circuit consists of the ECM, fuel pump and fuel pump ECU (which operates the fuel pump). Based on the engine output, the ECM determines the fuel pump speed. The speed is then converted to a duty signal and sent to the fuel pump ECU. Based on the signal sent from the ECM, the fuel pump ECU adjusts the fuel pump operation speed between 3 settings.WIRING DIAGRAMINSPECTION PROCEDUREThis troubleshooting procedure is based on the premise that the engine is started. If the engine is not started, proceed to the problem symptoms table . PROCEDURE1.PERFORM ACTIVE TEST USING TECHSTREAM (FUEL PUMP)(a) Connect the Techstream to the DLC3.(b) Turn the ignition switch to ON and turn the Techstream ON.(c) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.(d) Check whether operating sounds can be heard while operating the relay using the Techstream.OK:Operating sounds can be heard from relay.NGGO TO STEP 5OK2.CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM AND BODY GROUND)(a) Disconnect the R7 fuel pump ECU connector.(b) Disconnect the A24 ECM connector.(c) Measure the resistance according to the value(s) in the table below.Standard resistance:Tester ConnectionConditionSpecified ConditionR7-1 (FPC) - A24-52 (FPC)AlwaysBelow 1 ΩR7-2 (DI) - A24-18 (DI)AlwaysBelow 1 ΩR7-3 (E) - Body groundAlwaysBelow 1 ΩR7-1 (FPC) or A24-52 (FPC) - Body groundAlways10 kΩ or moreR7-2 (DI) or A24-18 (DI) - Body groundAlways10 kΩ or moreNGREPAIR OR REPLACE HARNESS OR CONNECTOROK3.REPLACE FUEL PUMP ECU(a) Replace the fuel pump ECU . NEXT4.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED(a) Check the fuel pump operation.OK:Malfunction has been repaired successfully.NG HYPERLINK "" REPLACE ECMOKEND5.INSPECT CIRCUIT OPENING RELAY (C/OPN)(a) Remove the circuit opening relay (C/OPN) from the engine room relay block . (b) Measure the resistance according to the value(s) in the table below.Standard resistance:Tester ConnectionConditionSpecified Condition3 - 5When no battery voltage applied to terminals 1 and 210 kΩ or higher3 - 5When battery voltage applied to terminals 1 and 2Below 1 ΩNG HYPERLINK "" REPLACE CIRCUIT OPENING RELAY (C/OPN)OK6.INSPECT CIRCUIT OPENING RELAY (POWER SOURCE VOLTAGE)(a) Remove the circuit opening relay (C/OPN) from the engine room relay block . (b) Turn the ignition switch to ON.(c) Measure the voltage according to the value(s) in the table below.Standard voltage:Tester ConnectionSwitch ConditionSpecified ConditionC/OPN relay (1) - Body groundIgnition switch ON11 to 14 VC/OPN relay (3) - Body groundIgnition switch ON11 to 14 VNGGO TO STEP 13OK7.CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - ECM AND FUEL PUMP ECU)(a) Remove the circuit opening relay (C/OPN) from the engine room relay block . (b) Disconnect the A24 ECM connector.(c) Disconnect the R7 fuel pump ECU connector.(d) Measure the resistance according to the value(s) in the table below.Standard resistance:Tester ConnectionConditionSpecified ConditionC/OPN relay (2) - A24-48 (FC)AlwaysBelow 1 ΩC/OPN relay (5) - R7-4 (+B)AlwaysBelow 1 ΩC/OPN relay (2) or A24-48 (FC) - Body groundAlways10 kΩ or higherC/OPN relay (5) or R7-4 (+B) - Body groundAlways10 kΩ or higherNGREPAIR OR REPLACE HARNESS OR CONNECTOROK8.CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP ECU)(a) Disconnect the R6 fuel pump connector.(b) Disconnect the R8 fuel pump ECU connector.(c) Measure the resistance according to the value(s) in the table below.Standard resistance:Tester ConnectionConditionSpecified ConditionR6-4 (B2) - R8-1 (FP)AlwaysBelow 1 ΩR6-5 (E2) - R8-2 (FP-)AlwaysBelow 1 ΩR6-4 (B2) or R8-1 (FP) - Body groundAlways10 kΩ or higherR6-5 (E2) or R8-2 (FP-) - Body groundAlways10 kΩ or higherNGREPAIR OR REPLACE HARNESS OR CONNECTOROK9.INSPECT FUEL PUMP(a) Inspect the fuel pump . NG HYPERLINK "" REPLACE FUEL PUMPOK10.CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM AND BODY GROUND)(a) Disconnect the R7 fuel pump ECU connector.(b) Disconnect the A24 ECM connector.(c) Measure the resistance according to the value(s) in the table below.Standard resistance:Tester ConnectionConditionSpecified ConditionR7-1 (FPC) - A24-52 (FPC)AlwaysBelow 1 ΩR7-2 (DI) - A24-18 (DI)AlwaysBelow 1 ΩR7-3 (E) - Body groundAlwaysBelow 1 ΩR7-1 (FPC) or A24-52 (FPC) - Body groundAlways10 kΩ or moreR7-2 (DI) or A24-18 (DI) - Body groundAlways10 kΩ or moreNGREPAIR OR REPLACE HARNESS OR CONNECTOROK11.REPLACE FUEL PUMP ECU(a) Replace the fuel pump ECU . NEXT12.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED(a) Check the fuel pump operation.OK:Malfunction has been repaired successfully.NG HYPERLINK "" REPLACE ECMOKEND13.CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP RELAY AND IGN FUSE)(a) Remove the circuit opening relay (C/OPN) from the engine room relay block . (b) Remove the fuel pump relay (F/PMP) from the engine room relay block . (c) Remove the IGN fuse from the engine room relay block.(d) Measure the resistance according to the value(s) in the table below.Standard resistance:Tester ConnectionConditionSpecified ConditionC/OPN relay (1) - IGN fuse (2)AlwaysBelow 1 ΩC/OPN relay (3) - F/PMP relay (3)AlwaysBelow 1 ΩC/OPN relay (1) or IGN fuse (2) - Body groundAlways10 kΩ or moreC/OPN relay (3) or F/PMP relay (3) - Body groundAlways10 kΩ or moreNGREPAIR OR REPLACE HARNESS OR CONNECTOROK14.INSPECT FUEL PUMP RELAY (F/PMP)(a) Remove the fuel pump relay (F/PMP) from the engine room relay block . (b) Measure the resistance according to the value(s) in the table below.Standard resistance:Tester ConnectionConditionSpecified Condition3 - 5When no battery voltage applied to terminals 1 and 210 kΩ or higher3 - 5When battery voltage applied to terminals 1 and 2Below 1 ΩNG HYPERLINK "" REPLACE FUEL PUMP RELAY (F/PMP)OK15.CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - INTEGRATION RELAY, BATTERY AND BODY GROUND)(a) Remove the F/PMP fuse from the engine room relay block.(b) Measure the resistance according to the value(s) in the table below.Standard resistance:Tester ConnectionConditionSpecified ConditionF/PMP fuseAlwaysBelow 1 Ω(c) Reinstall the F/PMP fuse.(d) Remove the fuel pump relay (F/PMP) from the engine room relay block . (e) Remove the integration relay from the engine room relay block . (f) Disconnect the 1B integration relay connector.(g) Disconnect the cable from the battery positive (+) terminal.(h) Measure the resistance according to the value(s) in the table below.Standard resistance:Tester ConnectionConditionSpecified ConditionF/PMP relay (1) - 1B-4AlwaysBelow 1 ΩF/PMP relay (5) - Positive (+) battery cableAlwaysBelow 1 ΩF/PMP relay (2) - Body groundAlwaysBelow 1 ΩF/PMP relay (1) or 1B-4 - Body groundAlways10 kΩ or higherF/PMP relay (5) or Positive (+) battery cable - Body groundAlways10 kΩ or higherNGREPAIR OR REPLACE HARNESS OR CONNECTOROK HYPERLINK "" GO TO ECM POWER SOURCE CIRCUITCopyright 2011 - 2013 Service Repair Solutions, Inc. Portions of materials contained herein have been reprinted under license from Toyota Motor Sales, U.S.A., Inc., License Agreement TMS1003. ................
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