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DTC P0230 FUEL PUMP PRIMARY CIRCUIT

DTC P0230 FUEL PUMP PRIMARY CIRCUIT

DTC DETECTING CONDITION:


• Immediately at fault recognition

• GENERAL DESCRIPTION


Important

After repair or replacement of faulty parts, conduct Clear Memory Mode and Inspection Mode .


WIRING DIAGRAM:


CHECK POWER SUPPLY CIRCUIT TO FUEL PUMP CONTROL UNIT.

Turn the ignition switch to OFF.

Disconnect the connector from fuel pump control unit.

Turn the ignition switch to ON.

Measure the voltage between fuel pump control unit and chassis ground.

Connector & terminal

(R122) No. 10 (+) — Chassis ground (−):

Is the voltage more than 10 V?

Yes


No

• Repair the power supply circuit.

•
Note

In this case repair the following:

• Open or ground short circuit in harness between fuel pump relay and fuel pump control unit

• Poor contact in fuel pump control unit connector

• Poor contact in fuel pump relay connector



CHECK GROUND CIRCUIT OF FUEL PUMP CONTROL UNIT.

Turn the ignition switch to OFF.

Measure the resistance of harness between fuel pump control unit and chassis ground.

Connector & terminal

(R122) No. 5 — Chassis ground:

Is the resistance less than 5 Ω?

Yes


No

• Repair the harness and connector.

•
Note

In this case, repair the following:

• Open circuit between fuel pump control unit and chassis ground

• Poor contact in fuel pump control unit connector



CHECK HARNESS BETWEEN FUEL PUMP CONTROL UNIT AND FUEL PUMP CONNECTOR.

Disconnect the connector from fuel pump.

Measure the resistance of harness between fuel pump control unit and fuel pump connector.

Connector & terminal

(R122) No. 7 — (R58) No. 1:

(R122) No. 6 — (R58) No. 4:

Is the resistance less than 1 Ω?

Yes


No

Repair the open circuit between fuel pump control unit and fuel pump.


CHECK HARNESS BETWEEN FUEL PUMP CONTROL UNIT AND FUEL PUMP CONNECTOR.

Measure the resistance of harness between fuel pump control unit and chassis ground.

Connector & terminal

(R122) No. 7 — Chassis ground:

(R122) No. 6 — Chassis ground:

Is the resistance more than 1 MΩ?

Yes


No

Repair the ground short circuit between fuel pump control unit and fuel pump.


CHECK HARNESS BETWEEN FUEL PUMP CONTROL UNIT AND ECM CONNECTOR.

Turn the ignition switch to OFF.

Disconnect the connector from ECM.

Measure the resistance of harness between fuel pump control unit and ECM connector.

Connector & terminal

(R122) No. 9 — (B134) No. 13:

(R122) No. 8 — (B137) No. 15:

Is the resistance less than 1 Ω?

Yes


No

• Repair the harness and connector.

•
Note

In this case, repair the following:

• Open circuit between fuel pump control unit and ECM

• Poor contact in fuel pump control unit and ECM connector



CHECK HARNESS BETWEEN FUEL PUMP CONTROL UNIT AND ECM CONNECTOR.

Measure the resistance of harness between fuel pump control unit and chassis ground.

Connector & terminal

(R122) No. 9 — Chassis ground:

(R122) No. 8 — Chassis ground:

Is the resistance more than 1 MΩ?

Yes


No

Repair the ground short circuit between fuel pump control unit and ECM.


CHECK POOR CONTACT.

Check poor contact in ECM and fuel pump control unit connector.

Is there poor contact in ECM and fuel pump control unit connector?

Yes

Repair the poor contact in ECM and fuel pump control unit.


No

Replace the fuel pump control unit.