P0230

DTC P0230 Fuel Pump Primary Circuit

CIRCUIT DESCRIPTION

DTC Detection Condition:

The fuel pump speed is controlled at 2 steps (high speed, low speed) according to the condition of the engine (starting, light load, heavy load).

When the engine starts, the ECM turns the fuel pump relay OFF to operate the fuel pump at high speed. After the engine has started, during idling or when the load is light, the ECM turns the fuel pump relay ON to operate the fuel pump at low speed. When the intake air increases (heavy load), the ECM turns the fuel pump relay OFF to operate the fuel pump at high speed. There are two fuel pumps. The ECM switches from main to sub or sub to main every time the ignition switch is turned ON and OFF.

HINT: This diagnostic chart is based on premise that engine is started. If the engine is not started, proceed to problem symptoms table.

Wiring Diagram:

Step 1 - 3:

INSPECTION PROCEDURE

HINT: Read freeze frame data using hand-held tester. Because freeze frame records the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining whether the vehicle was running or stopped, the engine warmed up or not, the air-fuel ratio lean or rich, etc. at the time of the malfunction.