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Home >> Lexus >> 2012 >> LS 460 AWD V8-4.6L (1UR-FSE) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Fuel Pump Control Circuit

Fuel Pump Control Circuit





1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: Fuel Pump Control Circuit
- Fuel Pump Control Circuit

DESCRIPTION

Refer to DTC P0230 P0230.

WIRING DIAGRAM

Refer to DTC P0230 P0230.

INSPECTION PROCEDURE

PROCEDURE

1. CHECK FUEL PUMP OPERATION

(a) Check the fuel pressure Fuel System.

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

OK -- INSPECT FUEL PUMP RELAY (F/PMP)
NG -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE CIRCUIT OPENING RELAY (C/OPN))

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

(c) Enter the following menus: Powertrain / Engine / Active Test / Activate the Fuel Pump Speed Control

(d) Check whether operating sounds can be heard while operating the relay using the Techstream.

OK:

Operating sounds can be heard from relay.

OK -- INSPECT ECM POWER SOURCE CIRCUIT
NG -- Continue to next step.

3. INSPECT CIRCUIT OPENING RELAY (C/OPN)





(a) Remove the C/OPN relay from the engine room No. 2 relay block.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE CIRCUIT OPENING RELAY (C/OPN) Testing and Inspection
OK -- Continue to next step.

4. INSPECT ECM (FC VOLTAGE)





(a) Turn the engine switch on (IG).

(b) Measure the voltage according to the value(s) in the table below.

Standard voltage:





OK -- REPLACE ECM Removal

NG -- CHECK AND REPLACE HARNESS OR CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - ECM, EFI-B FUSE)

5. INSPECT ECM POWER SOURCE CIRCUIT

(a) Inspect the ECM power source circuit ECM Power Source Circuit.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. INSPECT FUEL PUMP RELAY (F/PMP) P0230

NG -- REPLACE FUEL PUMP RELAY (F/PMP) Fuel Pump Relay
OK -- Continue to next step.

7. INSPECT FUEL PUMP ASSEMBLY





(a) Inspect the fuel pump resistance.

(1) Measure the resistance according to the value(s) in the table below.

Standard resistance:





(b) Inspect the fuel pump operation.

(1) Apply battery voltage to both terminals. Check that the pump operates.

NOTICE:
* These tests must be done quickly (within 10 seconds) to prevent the coil from burning out.
* Keep the fuel pump as far away from the battery as possible.
* Always turn the voltage on and off on the battery side, not the fuel pump side.

NG -- REPLACE FUEL PUMP ASSEMBLY Removal
OK -- Continue to next step.

8. CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP RELAY (F/PMP), BODY GROUND)





(a) Check the harness and connector between the fuel pump and F/PMP relay.

(1) Disconnect the S11 fuel pump connector.

(2) Remove the F/PMP relay from the engine room No. 2 relay block.

(3) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):





Standard resistance (Check for short):





(4) Reconnect the fuel pump connector.

(5) Reinstall the F/PMP relay.

(b) Check the harness and connector between the fuel pump and body ground.

(1) Disconnect the S11 fuel pump connector.

(2) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):





(3) Reconnect the fuel pump connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - FUEL PUMP RELAY (F/PMP))





(a) Remove the C/OPN relay and F/PMP relay from the engine room No. 2 relay block.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):





Standard resistance (Check for short):





NG -- REPAIR OR REPLACE ENGINE ROOM NO. 2 RELAY BLOCK, JUNCTION BLOCK

OK -- CHECK AND REPAIR HARNESS OR CONNECTOR (EFI RELAY (EFI MAIN) - CIRCUIT OPENING RELAY (C/OPN))

10. INSPECT FUEL PUMP RELAY (F/PMP) P0230

NG -- REPLACE FUEL PUMP RELAY (F/PMP) Fuel Pump Relay
OK -- Continue to next step.

11. INSPECT FUEL PUMP RESISTOR (RESISTANCE)





(a) Inspect the fuel pump resistor resistance.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE FUEL PUMP RESISTOR Removal
OK -- Continue to next step.

12. CHECK HARNESS AND CONNECTOR (FUEL PUMP RESISTOR - FUEL PUMP RELAY (F/PMP), FUEL PUMP)





(a) Check the harness and connector between the fuel pump relay and fuel pump resistor.

(1) Remove the F/PMP relay from the engine room No. 2 relay block.

(2) Disconnect the A16 fuel pump resistor connector.

(3) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):





Standard resistance (Check for short):





(4) Reinstall the F/PMP relay.

(5) Reconnect the fuel pump resistor connector.

(b) Check the harness and connector between the fuel pump resistor and fuel pump.

(1) Disconnect the A16 fuel pump resistor connector.

(2) Disconnect the S11 fuel pump connector.

(3) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):





Standard resistance (Check for short):





(4) Reconnect the fuel pump resistor connector.

(5) Reconnect the fuel pump connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures
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