P0230 Fuel Pump Primary Circuit - Automotive Repair Guides & Equipment

COMPONENT LOCATION

GENERAL DESCRIPTION

The ECM provides ground to one side of the coil in the fuel pump relay to control the fuel pump relay. The other side of the fuel pump relay coil is connected to main relay, which activates when the ignition switch is ON. The ECM monitors the control circuit between the fuel pump relay and the ECM. When the ignition switch is turned ON, the ECM energizes the fuel pump relay, which sends power to the fuel pump.

DTC DESCRIPTION

Checking fuel pump relay circuit continuously under detecting condition, if open or short in the circuit is detected ECM sets P0230.

※ In addition, Take note that open circuit in Main Relay may cause this P0230 code.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible Cause

DTC Strategy

Signal Low or High

1.	Poor connection

2.	Open or short in fuel pump relay circuit

3.	Open in Main Relay circuit

4.	Fuel Pump Relay

ECM

Enable Conditions

11V ≤ Battery Voltage ≤ 16V

Threshold value

Open or short

Diagnosis Time

Continuous (more than 5 sec. failure for every 10 sec.test)

MIL On Condition

NO MIL ON(DTC only)

DIAGNOSTIC CIRCUIT DIAGRAM

MONITOR GDS DATA

1.	Connect GDS to Data Link Connector(DLC).

IG “ON”.

3.	Select “DTC” button, and then Press “DTC Status” to check DTC’s information from the DTCs menu.

4.	Read “DTC Status” parameter.

Is parameter displayed “Present fault”?

	▶ Go to “Terminal and Connector inspection” procedure.
	▶ Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary

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.

Has a problem been found?

	▶ Repair as necessary and go to “Verification of Vehicle Repair” procedure .
	▶ Go to ” Power Circuit Inspection ” procedure.

POWER CIRCUIT INSPECTION

■ Check voltage

1.	IG “OFF” and disconnect fuel pump relay connector.

IG “ON”.

Measure voltage between battery power supply terminals of fuel pump relay harness and chassis ground.

Approx. B+

Is the measured voltage within specification ?

	▶ Go to “Signal circuit inspection” procedure.
	▶ Check “Fuse” between fuel pump relay and main relay is not installed or blown off. ▶ Check “Fuse” between fuel pump relay and battery is not installed or blown off. ▶ Check the Main relay that is not installed or blown off. ▶ Repair or replace as necessary and then, go to “Verification of Vehicle Repair” procedure.

CONTROL CIRCUIT INSPECTION

■ Check voltage

1.	IG “OFF” and disconnect fuel pump relay connector.

IG “ON”.

Measure voltage between fuel pump relay control terminal of Fuel pump relay harness and chassis ground.

Approx. 2.1V

Is the measured voltage within specification ?

	▶ Go to “Component Inspection” procedure.
	▶ Repair or replace as necessary

COMPONENT INSPECTION

■ Check fuel pump relay

1.	IG “OFF” and disconnect Fuel Pump Relay connector.

2.	Measure resistance between battery power supply and power supply to fuel pump motor terminals of fuel pump relay. (Measurement “A”)

Measure resistance between battery power supply and fuel pump relay control terminals of fuel pump relay.(Measurement “B”)

Specification :

Terminal	Continuity
Battery power supply – Power supply to Fuel pump motor	NO
Battery power supply – Fuel pump relay control	YES(Approx. 70Ω ~ 120Ω)

Is the measured resistance within specification ?

▶ Substitute with a known – good ECM and check for proper operation. If the problem is corrected, replace ECM and go to “Verification of Vehicle Repair” procedure.

There is a memory reset function on GDS that can erase optional parts automaticallydetected and memorized by ECM. Before or after testing ECM on the vehicle, use this function to reuse the ECM on the others

▶ Substitute with a known – good Fuel Pump Relay and check for proper operation. If the problem is corrected, replace Fuel Pump Relay

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