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Home >> Lexus >> 2008 >> LX 570 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTC P0128 - P0453 >> DTC P0230 Fuel Pump Primary Circuit >> Description
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DTC P0230 Fuel Pump Primary Circuit: Description

When a malfunction in the fuel pump circuit is detected, DTC P0230 is stored.

The fuel pump circuit consists of the ECM, fuel pump and fuel pump ECU (which operates the fuel pump). Based on the engine output, the ECM determines the fuel pump speed. The speed is then converted to a duty signal and sent to the fuel pump ECU. Based on the signal sent from the ECM, the fuel pump ECU adjusts the fuel pump operation speed between 3 settings. The fuel pump ECU also has a self-diagnosis function. Based on the fuel pump circuit condition, the fuel pump ECU outputs a diagnostic signal (Dl) to the ECM, and the ECM determines if there is a malfunction in the fuel pump circuit.

DTC DETECTION CONDITION CHART

DTC Code DTC Detection Condition Trouble Area
P0230 When either condition below is met (1 trip detection logic):
  • When the fuel pump is operating:
    • The remaining fuel is 17 L or more.
    • The Dl terminal output is low.
  • When the fuel pump is not operating:
    • The Dl terminal output is high.
  • Open or short in fuel pump circuit
  • Fuel pump
  • Fuel pump ECU
  • ECM
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