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Fuel Pump Control Circuit





4GR-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 if there is pressure in the fuel inlet hose.

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

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

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

(a) Connect Techstream to the DLC3.

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

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

(d) Check the operation of the relay while operating it using 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

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 R/B No. 2.





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

Standard resistance:

Below 1 Ohms

(c) Reinstall the F/PMP fuse.

NG -- REPLACE FUSE
OK -- Continue to next step.

5. INSPECT INTEGRATION NO.1 RELAY (EFI NO. 2 RELAY)

(a) Remove the integration relay from the engine room R/B No. 2.





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

Standard resistance:





(c) Reinstall the integration relay.

NG -- REPLACE INTEGRATION NO.1 RELAY
OK -- Continue to next step.

6. INSPECT INTEGRATION NO.1 RELAY (C/OPN RELAY)

(a) Remove the integration relay from the engine room R/B No. 2.





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

Standard resistance:





(c) Reinstall the integration relay.

NG -- REPLACE INTEGRATION NO.1 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 Removal

NG -- CHECK AND REPAIR HARNESS AND CONNECTOR (ECM - CIRCUIT OPENING RELAY)

1. INSPECT F/PMP RELAY

(a) Remove the F/PMP relay from the engine room R/B No. 2.





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

Standard resistance:





(c) Reinstall the F/PMP relay.

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

2. INSPECT FUEL PUMP

(a) Inspect fuel pump resistance.





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

Standard resistance:

0.2 to 3.0 Ohms at 20°C (68°F)

(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 switch at the battery side.
NG -- REPLACE FUEL PUMP
OK -- Continue to next step.

3. 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 Q14 fuel pump connector.

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

(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.

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

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

Standard resistance (Check for open):





(2) Reconnect the fuel pump connector.

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

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

(a) Remove the integration relay from the engine room R/B No. 2.

(b) Remove the F/PMP relay from the engine room R/B No. 2.

(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 F/PMP relay.

(e) Reinstall the integration relay.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPAIR OR REPLACE INTEGRATION NO.1 RELAY

1. INSPECT F/PMP RELAY

(a) Remove the F/PMP relay from the engine room R/B No. 2.





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

Standard resistance:





(c) Reinstall the F/PMP relay.

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

2. INSPECT FUEL PUMP RESISTER

(a) Measure the resistance of the fuel pump resistor.





Standard resistance:

0.30 to 0.34 Ohms at 20°C (68°F)

NG -- REPLACE FUEL PUMP RESISTER
OK -- Continue to next step.

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

(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 R/B No. 2.

(2) Disconnect the A40 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) Reconnect the fuel pump resistor connector.

(5) Reinstall the F/PMP relay.

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

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
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