P0230

4GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0230: Fuel Pump Primary Circuit
P0230 - Fuel Pump Primary Circuit

DESCRIPTION

When the engine is cranked, a signal is sent from the ignition control ECU's STSW terminal to the ECM's STSW terminal. Then voltage travels from the ECM's STAR terminal through the park/neutral position switch to the STARTER relay coil. The STAR terminal also sends a signal to the STA terminal. When the STA signal and NE signal are input to the ECM, the ECM interior's Tr1 turns on, which causes power to be supplied to the C/OPN relay coil (C/OPN on). As a result, the F/PMP relay actuates, which causes the fuel pump to operate. If the engine is operating and NE signals are being output, the ECM interior's Tr1 is on (C/OPN on), and the fuel pump will continue operating. The fuel pump's has a high and low speed setting. When the engine is starting or operating with a heavy load, the ECM interior's Tr2 turns off so that the F/PMP relay will close and the fuel pump will operates at the high speed setting. When the engine is idling or operating with a light load, the Tr2 turns on, operating the F/PMP relay and causing current to flows through the fuel pump resistor to the fuel pump. This operates the fuel pump at the low speed setting.









CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.

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

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Reading and Clearing Diagnostic Trouble Codes.

4. Turn the engine switch off and wait for at least 30 seconds.

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

6. Start the engine.

7. After starting the engine, wait 5 seconds.

8. Enter the following menus: Powertrain / Engine / Trouble Codes.

9. Read the pending DTC.

HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.

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

11. Input the DTC: P0230.

12. Check the DTC judgment result.





HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.

13. If the test result is INCOMPLETE or N/A and no DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

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

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
Read freeze frame data using Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction Freeze Frame Data.

PROCEDURE

1. CHECK ECM (FPR VOLTAGE)

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





Standard voltage:





NG -- INSPECT RELAY (F/PMP RELAY)

OK -- REPLACE ECM Removal

2. INSPECT RELAY (F/PMP RELAY)

(a) Remove the F/PMP relay from the engine room R/B No. 2.





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

Standard resistance:





(c) Reinstall the F/PMP relay.

NG -- REPLACE RELAY (F/PMP RELAY)
OK -- Continue to next step.

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

(a) Remove the F/PMP relay from the engine room R/B No. 2.

(b) Disconnect the A5 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 F/PMP relay.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (F/PMP RELAY - C/OPN RELAY)