P0230

2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0230: Fuel Pump Primary Circuit

DTC P0230 - Fuel Pump Primary Circuit

DESCRIPTION

- This DTC is designed to detect a malfunction in the fuel pump (FUEL PUMP) relay circuit. When the system is normal, the battery voltage is applied to FPR terminal of the ECM while the FUEL PUMP relay is turned OFF. If the battery voltage is not applied to the FPR terminal while the FUEL PUMP relay is OFF, the ECM interprets this as a malfunction. The ECM then illuminates the MIL and sets a DTC.
- The FUEL PUMP relay switches the fuel pump speed according to the engine conditions. The fuel pump operates when the ECM receives the starter-operating signal (STA) and crankshaft-rotating signal (NE). The FUEL PUMP relay is turned ON while the engine is idling or operating at low load. This causes current to flow through the fuel pump resistor to the fuel pump. The fuel pump then operates at low speed. The FUEL PUMP relay is turned OFF while the engine is cranking or operating at high load. The fuel pump then operates at normal speed.





WIRING DIAGRAM





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.

INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position and turn Techstream ON.
(c) Enter the following menus: Powertrain / Engine and ECT / 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 -- CHECK FOR INTERMITTENT PROBLEMS
NG -- Continue to next step.
2. INSPECT RELAY (FUEL PUMP RELAY)





(a) Remove the FUEL PUMP relay from the engine room junction block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Reinstall the FUEL PUMP relay.
NG -- REPLACE RELAY (FUEL PUMP RELAY)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - ECM)





(a) Remove the FUEL PUMP relay from the engine room junction block.
(b) Disconnect the E11 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(d) Reconnect the ECM connector.
(e) Reinstall the FUEL PUMP relay.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PUMP RELAY - ECM)
OK -- REPLACE ECM