P0230

P0230 - Fuel pump Relay - Malfunction




Component Location




DTC Detecting Condition




Schematic Diagram




Signal Waveform

1. Point (1) is the duration PCM makes FUEL PUMP RELAY ON for 1.5 second after ignition switch ON.
2. Point (2) is MAIN RELAY ON and its voltage should be over 12V.
3. Point (3) is where PCM makes FUEL PUMP ON when it detects starting RPM(50) with CKPS signal.

Monitor DTC Status

1. Connect scantool to Data Link Connector(DLC).
2. Warm up the engine to normal operating temperature.




3. Monitor the "Fuel pump relay" parameter on the scantool.


NOTE: The data shown above is only for reference and there may be a little difference actually.

Service standard
Ignition switch ON : ON 1.5 sec >> OFF
Engine running : ON

4. Is parameter displayed within specifications?

YES
1) Fault is intermittent caused by poor contact in the sensor�s and/or PCM�s connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion,contamination,deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.

NO
1) Go to "W/Harness Inspection" procedure.


Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination,deterioration, or damage.
3. Has a problem been found?

YES
1) Repair as necessary and go to "Verification of vehicle Repair" procedure.

NO
1) Go to "Power circuit inspection" procedure.


Power Supply Circuit Inspection

1. Ignition "OFF"
2. Disconnect connect fuel pump relay.
3. Ignition "ON" & Engine "OFF"





4. Measure voltage between terminal 1 and 5 of fuel pump relay harness connector and chassis ground.

A. Specification : approximately B+

5. Is measure voltage within Specification?

YES
1) Go to "Control circuit insepction" procedure.

NO
1) Open circuit or short circuit to chassis ground between fuel pump relay and control relay. Repair as necessary and then go to "Verification of Vehicle Repair" procedure.


Control Circuit Inspection

1. Ignition "OFF"
2. Connect fuel pump relay and PCM connector.
3. Ignition "ON" & Engine "OFF"





4. Measure voltage between terminal 70 of ECM harness connector and chassis ground.

A. Specification : approximately B+

5. Is measure voltage within Specification?

YES
1) Go to "Component Inspection" procedure.

NO
1) Short circuit to chassis ground between fuel pump relay signal circuit and PCM harness connector.
Open circuit between fuel pump relay signal circuit and PCM harness connector.
Open circuit pump relay.
Repair as necessary and then go to "Verification of Vehicle Repair" procedure.


NOTE:

1. In case the voltage at terminal 70 of PCM is 0V.

>Possible cause: Open circuit between fuel pump relay and ECM, or open coil in fuel pump relay.


Component Inspection

1. Check fuel pump relay

(1) Ignition "OFF"
(2) Disconnect the fuel pump relay
(3) Apply 12V and a ground to 3 and 5 terminals of the fuel pump relay




(4) Measure resistance between terminal 1 and 2 of fuel pump relay connector(To sensor side)

A. Specification : below 1 ohm


(5) Does each resistance indicate continuity circuit?

YES
1) Substitute with a known-good PCM and check for proper operation. If the problem is corrected, replace PCM and then go to "Verification of Vehicle Repair" procedure.

NO
1) Substitute with a known-good control relay and check for proper operation. If the problem is corrected, replace control relay and then go to "Verification of Vehicle Repair" procedure.


Verification of Vehicle Repair

1. Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code (DTC) which has been diagnosed.
2. Using a Scantool, Clear the DTCs.
3. Operate the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Monitor that all rediness test have been verified as "Complete"
5. Are any DTCs present ?

YES
1) Go to the applicable troubleshooting procedure.

NO
1) System is performing to specification at this time.