Fuel Pump Control Circuit
2UZ-FE 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 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 FUEL PUMP 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 ignition switch ON and turn the tester ON.
(c) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.
(d) Check the relay operation when it is operated by the Techstream.
Standard:
Operating sound can be heard from the relay.
OK -- CHECK ECM POWER SOURCE CIRCUIT
NG -- Continue to next step.
3. INSPECT CIRCUIT OPENING RELAY (Marking: C/OPN)
(a) Remove the circuit opening relay from the engine room R/B.
(b) Measure the resistance of the circuit opening relay.
Standard resistance:
(c) Reinstall the circuit opening relay.
NG -- REPLACE CIRCUIT OPENING RELAY
OK -- Continue to next step.
4. INSPECT ECM (FC VOLTAGE)
(a) Turn the ignition switch ON.
(b) Measure the voltage of the E7 and E9 ECM connectors.
Standard voltage:
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 the ECM Power Source Circuit ECM Power Source Circuit.
NG -- REPAIR OR REPLACE
OK -- Continue to next step.
6. INSPECT FUEL PUMP RELAY
(a) Remove the fuel pump relay from the engine room R/B.
(b) Measure the resistance of the fuel pump relay.
Standard resistance:
(c) Reinstall the fuel pump relay.
NG -- REPLACE FUEL PUMP RELAY
OK -- Continue to next step.
7. INSPECT FUEL PUMP
(a) Check the fuel pump operation Testing and Inspection.
NG -- REPLACE FUEL PUMP
OK -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP RELAY, FUEL PUMP - BODY GROUND)
(a) Check the harness and connector between the fuel pump and fuel pump relay.
(1) Disconnect the F15 fuel pump connector.
(2) Remove the fuel pump relay from the engine room R/B.
(3) Measure the resistance between the wire harness side connectors.
Standard resistance (Check for open):
Standard resistance (Check for short):
(b) Check the harness and connector between the fuel pump and body ground.
(1) Disconnect the F15 fuel pump connector.
(2) Measure the resistance between the wire harness side connector and body ground.
Standard resistance (Check for open):
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP RELAY)
(a) Remove the circuit opening relay from the engine room R/B.
(b) Remove the fuel pump relay from the engine room R/B.
(c) Measure the resistance between the wire harness side connectors.
Standard resistance (Check for open):
Standard resistance (Check for short):
(d) Reinstall the circuit opening relay.
(e) Reinstall the fuel pump relay.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- CHECK AND REPAIR HARNESS OR CONNECTOR (EFI RELAY - CIRCUIT OPENING RELAY)
10. INSPECT FUEL PUMP RELAY
(a) Remove the fuel pump relay from the engine room R/B.
(b) Measure the resistance of the fuel pump relay.
Standard resistance:
(c) Reinstall the fuel pump relay.
NG -- REPLACE FUEL PUMP RELAY
OK -- Continue to next step.
11. INSPECT FUEL PUMP RESISTOR (RESISTANCE)
(a) Inspect the fuel pump resistor resistance.
(1) Measure the resistance of the terminals.
Standard resistance:
0.70 to 0.76 Ohms at 20°C (68°F)
NG -- REPLACE FUEL PUMP RESISTOR
OK -- Continue to next step.
12. CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - FUEL PUMP RESISTOR, FUEL PUMP RESISTOR - FUEL PUMP)
(a) Check the harness and connector between the fuel pump relay and fuel pump resistor.
(1) Remove the fuel pump relay from the engine room R/B.
(2) Disconnect the F6 fuel pump resistor connector.
(3) Check the resistance between the wire harness side connectors.
Standard resistance (Check for open):
Standard resistance (Check for short):
(4) Reinstall the fuel pump 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 F6 fuel pump resistor connector.
(2) Disconnect the F15 fuel pump connector.
(3) Check the resistance between the wire harness side connectors.
Standard resistance (Check for open):
Standard resistance (Check for short):
(c) Reconnect the fuel pump resistor connector.
(d) Reconnect the fuel pump connector.
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR