SFI SYSTEM, Diagnostic DTC:P0230

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 Click here.

INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch on (IG) and tester on.

   3. Select the following menu items: Powertrain / Engine and ECT / Active Test / Active the Fuel Pump Speed Control.

   4. Check the operation of the relay while operating it using the tester.

      OK
      Operating noise can be heard from the relay.

   
   

   NG

   INSPECT RELAY (FUEL PMP RELAY) Click here

   OK

   REPLACE ECM Click here

2. INSPECT RELAY (FUEL PMP RELAY)

   
   

   1. 

      Remove the FUEL PMP relay from the engine room relay block.

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

      Standard resistance
      Tester Connection Condition Specified Condition 1 - 2 Always Approximately 111 Ω

   3. Reinstall the FUEL PMP relay.

   
   

   NG

   REPLACE RELAY

   OK

3. CHECK HARNESS AND CONNECTOR (FUEL PMP RELAY - ECM)

   
   

   1. 

      Remove the FUEL PMP relay from the engine room relay block.

   2. Disconnect the ECM connector.

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

      Standard resistance
      Tester Connection Specified Condition FUEL PUMP relay terminal 1 - B3-30 (FPR) Below 1 Ω FUEL PUMP relay terminal 1 or B3-30 (FPR) - Body ground 10 kΩ or higher

   4. Reconnect the ECM connector.

   5. Reinstall the FUEL PMP relay.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE ECM Click here