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Fuel Pump Control Circuit








1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Fuel Pump Control Circuit

Fuel Pump Control Circuit

DESCRIPTION

The fuel pump circuit consists of the ECM, fuel pump and fuel pump ECU (which operates the fuel pump). Based on the engine output, the ECM determines the fuel pump speed. The speed is then converted to a duty signal and sent to the fuel pump ECU. Based on the signal sent from the ECM, the fuel pump ECU adjusts the fuel pump operation speed between 3 settings.

WIRING DIAGRAM





INSPECTION PROCEDURE

This troubleshooting procedure is based on the premise that the engine is started. If the engine is not started, proceed to the problem symptoms table Symptom Related Diagnostic Procedures.

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (FUEL PUMP)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and turn the Techstream ON.
(c) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.
(d) Check whether operating sounds can be heard while operating the relay using the Techstream.
OK:
Operating sounds can be heard from relay.
NG -- INSPECT CIRCUIT OPENING RELAY (C/OPN)
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM, BODY GROUND) P0230
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. REPLACE FUEL PUMP ECU
(a) Replace the fuel pump ECU Removal.
(b) Check the fuel pump operation.
OK:
Malfunction has been repaired successfully.
NG -- REPLACE ECM
OK -- END
4. INSPECT CIRCUIT OPENING RELAY (C/OPN) P0230
NG -- REPLACE CIRCUIT OPENING RELAY (C/OPN)
OK -- Continue to next step.
5. INSPECT CIRCUIT OPENING RELAY (POWER SOURCE VOLTAGE) P0230
NG -- CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - IGN FUSE, INTEGRATION RELAY)
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - ECU, FUEL PUMP ECU) P0230
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP ECU) P0230
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
8. INSPECT FUEL PUMP
(a) Inspect the fuel pump Fuel Pump.
NG -- REPLACE FUEL PUMP
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM, BODY GROUND) P0230
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. REPLACE FUEL PUMP ECU
(a) Replace the fuel pump ECU Removal.
(b) Check the fuel pump operation.
OK:
Malfunction has been repaired successfully.
NG -- REPLACE ECM
OK -- END
11. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - IGN FUSE, INTEGRATION RELAY) P0230
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- GO TO ECM POWER SOURCE CIRCUIT
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