Up to 08/2009

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

DESCRIPTION

- This DTC is designed to detect a malfunction in the F/PMP relay circuit. When the system is normal, battery voltage is applied to the FPR terminal of the ECM while the F/PMP relay is off. If battery voltage is not applied to the FPR terminal while the F/PMP relay is off, the ECM interprets this as a malfunction. The ECM then illuminates the MIL and sets a DTC.

- The F/PMP relay switches the fuel pump speed according to the engine conditions. The fuel pump operates when the ECM receives the STA signal and NE signal. The F/PMP 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 F/PMP relay is turned off while the engine is cranking or operating at high load. The fuel pump then operates at normal speed.









CONFIRMATION DRIVING PATTERN





- Connect the Techstream to the DLC3.

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

- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) DTC Check / Clear.

- Turn the engine switch off.

- Turn the engine switch on (IG) and turn the Techstream on [A].

- Start the engine.

- After starting the engine, wait 5 seconds [B].

- Enter the following menus: Powertrain / Engine / Utility / All Readiness.

- Input the DTC: P0230.

- Check the DTC judgment result [C].





HINT
If the judgment result shows ABNORMAL, the system has a malfunction.

- If the test result is UNKNOWN, enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

- Read Pending DTCs.

HINT
If a pending DTC is output, the system is malfunctioning.

- If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
This troubleshooting procedure is based on the premise that the engine can start. If the engine cannot start, proceed to Problem Symptoms Table Symptom Related Diagnostic Procedures.

PROCEDURE

1. INSPECT F/PMP RELAY

(a) Remove the F/PMP relay from the engine room relay block.





(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. CHECK TERMINAL VOLTAGE (F/PMP RELAY)

(a) Remove the F/PMP relay from the engine room relay block.





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

Standard Voltage:





Text in Illustration





(c) Reinstall the F/PMP relay.

NG -- CHECK FUEL PUMP CONTROL CIRCUIT
OK -- Continue to next step.

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

(a) Remove the F/PMP relay from the engine room relay block.





(b) Disconnect the ECM connector.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





Text in Illustration





(d) Reconnect the ECM connector.

(e) Reinstall the F/PMP relay.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (F/PMP RELAY - ECM)

OK -- REPLACE ECM Removal