DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP/SPEED)
INSPECT FUEL PUMP ECU (POWER SOURCE VOLTAGE)
CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - BODY GROUND)
CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP ECU)
INSPECT FUEL PUMP
CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM)
REPLACE FUEL PUMP ECU
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
INSPECT EFI NO.2 RELAY
CHECK EFI NO.2 RELAY (POWER SOURCE VOLTAGE)
CHECK HARNESS AND CONNECTOR (EFI NO.2 RELAY - FUEL PUMP ECU)
CHECK HARNESS AND CONNECTOR (EFI NO.2 RELAY - INTEGRATION RELAY, BATTERY AND BODY GROUND)
PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP)
CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM)
REPLACE FUEL PUMP
REPLACE FUEL PUMP ECU
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
SFI SYSTEM - Fuel Pump Control Circuit
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
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
| 1.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP/SPEED) |
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
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| Result | Proceed to |
| NG | A |
| OK | B |
| 2.INSPECT FUEL PUMP ECU (POWER SOURCE VOLTAGE) |
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:
| Tester Connection | Switch Condition | Specified Condition |
| N14-6 (+B) - Body Ground | Engine switch on (IG) | 11 to 14 V |
| 3.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:
| Tester Connection | Condition | Specified Condition |
| N14-3 (E) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 4.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:
| Tester Connection | Condition | Specified Condition |
| N1-4 (B2) - N14-1 (FP) | Always | Below 1 Ω |
| N1-5 (E2) - N14-2 (FP-) | Always | Below 1 Ω |
| N1-4 (B2) or N14-1 (FP) - Body ground | Always | 10 kΩ or higher |
| N1-5 (E2) or N14-2 (FP-) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
Inspect the fuel pump ().
| 6.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:
| Tester Connection | Condition | Specified Condition |
| N14-5 (FPC) - A38-52 (FPC) | Always | Below 1 Ω |
| N14-5 (FPC) or A38-52 (FPC) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
Replace the fuel pump ECU ().
| 8.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED |
Check the fuel pump operation.
- OK:
- Malfunction has been repaired successfully.
Inspect the EFI NO.2 relay ().
| 10.CHECK EFI NO.2 RELAY (POWER SOURCE VOLTAGE) |
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:
| Tester Connection | Condition | Specified Condition |
| EFI NO.2 relay (1) - Body ground | Engine switch on (IG) | 11 to 14 V |
| EFI NO.2 relay (5) - Body ground | Always | 11 to 14 V |
| 11.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:
| Tester Connection | Condition | Specified Condition |
| EFI NO.2 relay (3) - N14-6 (+B) | Always | Below 1 Ω |
| EFI NO.2 relay (3) or N14-6 (+B) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK | |
| |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PUMP RELAY - BODY GROUND) |
|
| 12.CHECK HARNESS AND CONNECTOR (EFI NO.2 RELAY - 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 integration relay from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| EFI NO.2 relay (1) - 1B-4 | Always | Below 1 Ω |
| EFI NO.2 relay (5) - Battery positive (+) terminal | Always | Below 1 Ω |
| EFI NO.2 relay (2) - Body ground | Always | Below 1 Ω |
| EFI NO.2 relay (1) or 1B-4 - Body ground | Always | 10 kΩ or higher |
| EFI NO.2 relay (5) or Battery positive (+) terminal - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK | |
| |
| GO TO ECM POWER SOURCE CIRCUIT ()
|
|
| 13.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP) |
Remove the fuel tank assembly ().
Remove the fuel pump from the fuel tank assembly.
Clean the fuel pump to completely remove any remaining fuel.
Connect the fuel pump connector.
- 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).
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:
| Tester Connection | Tester Operation | Specified Condition |
| 1 - 2 | FPC Duty: 25% | 3.2 to 4.05 V |
| FPC Duty: 80% | 8.8 to 12.5 V |
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:
| Tester Connection | Tester Operation | Specified Condition |
| 1 - 2 | ON (FPC Duty: 90%) | 9.0 to 14.0 V |
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).
| 14.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:
| Tester Connection | Condition | Specified Condition |
| N14-5 (FPC) - A38-52 (FPC) | Always | Below 1 Ω |
| N14-5 (FPC) or A38-52 (FPC) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
Replace the fuel pump ().
Replace the fuel pump ECU ().
| 17.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED |
Check the fuel pump operation.
- OK:
- Malfunction has been repaired successfully.
