Last Modified: 4-30-2014 6.6 J Doc ID: RM000000TMK008X
Model Year: 2006 Model: LX470 Prod Date Range: [05/2005 -           ]
Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Fuel Pump Control Circuit; 2006 MY LX470 [05/2005 -        ]

Fuel Pump Control Circuit

DESCRIPTION

Refer to DTC P0230 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0230; Fuel Pump Primary Circuit+ .

WIRING DIAGRAM

Refer to DTC P0230 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0230; Fuel Pump Primary Circuit+ .

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK FUEL PUMP OPERATION

(a) Check if there is pressure in the fuel inlet hose.

HINT:

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

OK

GO TO STEP 10

NG

2.

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE CIRCUIT OPENING RELAY)

(a) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.

(b) Turn the ignition switch ON and turn the intelligent tester ON.

(c) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP / SPD.

(d) Check the relay operation when it is operated by the intelligent tester.

Standard:

Operating sound can be heard from the relay.

OK

GO TO STEP 5

NG

3.

INSPECT CIRCUIT OPENING RELAY (Marking: C/OPN)

(a) Remove the circuit opening relay from the engine room relay block.

(b) Measure the resistance of the circuit opening relay.

Standard resistance:

Tester Connection

Specified Condition

3 - 5

10 kΩ or higher

3 - 5

Below 1 Ω

(when battery voltage is applied to terminals 1 and 2)

(c) Reinstall the circuit opening relay.
NG

REPLACE CIRCUIT OPENING RELAY

OK

4.

INSPECT ECM (FC VOLTAGE)

(a) Turn the ignition switch ON.

(b) Measure the voltage of the E6 and E10 ECM connectors.

Standard voltage:

Tester Connection

Specified Condition

E10-10 (FC) - E6-1 (E1)

9 to 14 V
OK

REPLACE ECM

NG

CHECK AND REPAIR HARNESS OR CONNECTOR (ECM - CIRCUIT OPENING RELAY, CIRCUIT OPENING RELAY - IGNITION SWITCH)

5.

CHECK ECM POWER SOURCE CIRCUIT

(a) Check ECM Power Source Circuit 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: ECM Power Source Circuit .

NG

REPAIR OR REPLACE

OK

6.

INSPECT FUEL PUMP RELAY (Marking: F/PUMP)

(a) Remove the fuel pump relay from the engine room relay block.

(b) Measure the resistance of the fuel pump relay.

Standard resistance:

Tester Connection

Specified Condition

3 - 4

Below 1 Ω

3 - 5

10 kΩ or higher

3 - 4

10 kΩ or higher

(when battery voltage is applied to terminals 1 and 2)

3 - 5

Below 1 Ω

(when battery voltage is applied to terminals 1 and 2)

(c) Reinstall the fuel pump relay.
NG

REPLACE FUEL PUMP RELAY

OK

7.

INSPECT FUEL PUMP

(a) Inspect fuel pump resistance.

(1) Disconnect the F13 fuel pump connector.

(2) Measure the resistance of the fuel pump.

Standard resistance:

Tester Connection

Specified Condition

4 - 5

0.2 to 3.0 Ω at 20°C (68°F)

(3) Reconnect the fuel pump connector.

(b) Inspect fuel pump operation.

(1) Apply battery voltage to F13-4 (+) and F13-5 (-) terminals. Check that the pump operates.

NOTICE:

  • These tests must be done quickly (within 10 seconds) to prevent the coil from burning out.
  • Keep fuel pump as far away from the battery as possible.
  • Always do the switching at the battery side.
NG

REPLACE FUEL PUMP

OK

8.

CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP RELAY, FUEL PUMP - BODY GROUND)

(a) Check harness and connector 2006 MY LX470 [05/2005 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.

CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP RELAY)

(a) Check harness and connector 2006 MY LX470 [05/2005 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

CHECK AND REPAIR HARNESS OR CONNECTOR (EFI RELAY - CIRCUIT OPENING RELAY)

10.

INSPECT FUEL PUMP RELAY (Marking: F/PUMP)

(a) Remove the fuel pump relay from the engine room relay block.

(b) Measure the resistance of the fuel pump relay.

Standard resistance:

Tester Connection

Specified Condition

3 - 4

Below 1 Ω

3 - 5

10 kΩ or higher

3 - 4

10 kΩ or higher

(when battery voltage is applied to terminals 1 and 2)

3 - 5

Below 1 Ω

(when battery voltage is applied to terminals 1 and 2)

(c) Reinstall the fuel pump relay.
NG

REPLACE FUEL PUMP RELAY

OK

11.

INSPECT FUEL PUMP RESISTOR (RESISTANCE)

(a) Inspect the fuel pump resistor resistance.

(1) Measure the resistance of the terminals.

Resistance:

0.94 to 1.0 Ω at 20°C (68°F)
NG

REPLACE FUEL PUMP RESISTOR

OK

12.

CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - FUEL PUMP RESISTOR, FUEL PUMP RESISTOR - FUEL PUMP)

(a) Check harness and connector 2006 MY LX470 [05/2005 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR