DESCRIPTION
The 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.
WIRING DIAGRAM
INSPECTION PROCEDURE
Note
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP/SPEED)
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump/Speed.
Check whether operating sounds can be heard while operating the fuel pump using the GTS.
OK |
---|
Operating sounds can be heard from fuel pump. |
Result | Proceed to |
---|---|
NG | A |
OK | B |
B |
PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP) Click here |
A |
INSPECT FUEL PUMP ECU (POWER SOURCE VOLTAGE)
*a | Front view of wire harness connector (to fuel pump ECU) |
Disconnect the fuel pump ECU connector.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
NG |
INSPECT EFI NO.2 RELAY Click here |
OK |
CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - BODY GROUND)
Disconnect the fuel pump ECU connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP ECU)
Disconnect the fuel pump connector.
Disconnect the fuel pump ECU connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT FUEL PUMP
Inspect the fuel pump Click here.
NG |
REPLACE FUEL PUMP Click here |
OK |
CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM)
Disconnect the fuel pump ECU connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
REPLACE FUEL PUMP ECU
Replace the fuel pump ECU Click here.
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
Check the fuel pump operation.
OK |
---|
Malfunction has been repaired successfully. |
NG |
REPLACE ECM Click here |
OK |
END
INSPECT EFI NO.2 RELAY
Inspect the EFI NO.2 relay Click here.
NG |
REPLACE EFI NO.2 RELAY |
OK |
CHECK EFI NO.2 RELAY (POWER SOURCE VOLTAGE)
*1 | Engine Room Relay Block: |
*2 | EFI NO. 2 RELAY |
Remove the EFI NO.2 relay from the engine room relay block.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
CHECK HARNESS AND CONNECTOR (EFI NO.2 RELAY - NO. 1 INTEGRATION RELAY, BATTERY AND BODY GROUND) Click here |
OK |
CHECK HARNESS AND CONNECTOR (EFI NO.2 RELAY - FUEL PUMP ECU)
Remove the EFI NO.2 relay from the engine room relay block.
Disconnect the fuel pump ECU connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PUMP RELAY - BODY GROUND)
CHECK HARNESS AND CONNECTOR (EFI NO.2 RELAY - NO. 1 INTEGRATION RELAY, BATTERY AND BODY GROUND)
Disconnect the cable from the negative (-) battery terminal.
Disconnect the cable from the positive (+) battery terminal.
Remove the EFI NO.2 relay from the engine room relay block.
Remove the No. 1 integration relay from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
GO TO ECM POWER SOURCE CIRCUIT Click here
PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP)
*a | Component with harness connected (Fuel Pump) |
Remove the fuel tank assembly Click here.
Remove the fuel pump from the fuel tank assembly.
Clean the fuel pump to completely remove any remaining fuel.
Connect the fuel pump connector.
CAUTION:
Confirm that no fuel remains inside or on the outside of the fuel pump.
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump Duty.
Operate the fuel pump using the active test function and measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||||
---|---|---|---|---|---|---|---|---|
|
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.
Operate the fuel pump using the active test function and measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Tech Tips
Be sure to measure the voltage with all of the connectors connected.
Before performing this inspection, check that the battery voltage is between 11 and 14 V (not depleted).
NG |
REPLACE FUEL PUMP ECU Click here |
OK |
CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM)
Disconnect the fuel pump ECU connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
REPLACE FUEL PUMP
Replace the fuel pump Click here.
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here |
REPLACE FUEL PUMP ECU
Replace the fuel pump ECU Click here.
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
Check the fuel pump operation.
OK |
---|
Malfunction has been repaired successfully. |
NG |
REPLACE ECM Click here |
OK |
END