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Home >> Lexus >> 2011 >> GS 460 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 (FUEL PUMP OPERATION)

(a) Check the fuel pump operation Fuel System.

OK -- INSPECT F/PMP RELAY
NG -- Continue to next step.

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

(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 the operation of the relay while operating it using the Techstream.

OK:

Operating noise can be heard from the relay.

OK -- INSPECT F/PMP RELAY
NG -- Continue to next step.

3. INSPECT ECM POWER SOURCE CIRCUIT

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

NG -- REPAIR OR REPLACE POWER SOURCE CIRCUIT
OK -- Continue to next step.

4. INSPECT FUSE (F/PMP FUSE)

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





(b) Measure the resistance of the F/PMP fuse.

Standard Resistance:

Below 1 Ohms

(c) Reinstall the fuse.

NG -- CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.

5. INSPECT INTEGRATION RELAY (EFI NO. 2 RELAY)

(a) Remove the integration relay from the engine room No. 2 junction block.





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

Standard Resistance:





(c) Reinstall the relay.

NG -- REPLACE INTEGRATION RELAY
OK -- Continue to next step.

6. INSPECT INTEGRATION RELAY (C/OPN RELAY)

(a) Remove the integration relay from the engine room No. 2 junction block.





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

Standard Resistance:





(c) Reinstall the relay.

NG -- REPLACE INTEGRATION RELAY
OK -- Continue to next step.

7. 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 Components

NG -- CHECK AND REPAIR HARNESS AND CONNECTOR (ECM - C/OPN RELAY)

8. INSPECT F/PMP RELAY

(a) Remove the 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:





(c) Reinstall the relay.

NG -- REPLACE F/PMP RELAY
OK -- Continue to next step.

9. INSPECT FUEL PUMP

(a) Inspect fuel pump resistance.





(1) Measure the resistance between terminals 4 and 5.

Standard Resistance:





(b) Inspect 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 Components
OK -- Continue to next step.

10. CHECK HARNESS AND CONNECTOR (FUEL PUMP - F/PMP RELAY)

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

(1) Disconnect the 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):





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

(1) Disconnect the fuel pump connector.

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

Standard Resistance (Check for Open):





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

11. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - F/PMP RELAY)

(a) Remove the integration relay from the engine room No. 2 junction block.

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

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





(d) Reinstall the relays.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPAIR OR REPLACE FUEL SYSTEM (PRESSURE REGULATOR, FUEL PIPE LINE AND FUEL FILTER)

12. INSPECT F/PMP RELAY

(a) Remove the 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:





(c) Reinstall the relay.

NG -- REPLACE F/PMP RELAY
OK -- Continue to next step.

13. INSPECT FUEL PUMP RESISTOR

(a) Disconnect the fuel pump resistor connector.





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

Standard Resistance:





(c) Reconnect the fuel pump resistor connector.

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

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

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

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

(2) Disconnect the 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 relay.

(5) Reconnect the fuel pump resistor connector.

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
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