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FC3574 Low DEF pressure detected in metering pump

Prerequisites for diagnostic operation:

- Metering pump pre-filling successful

Conditions for fault code triggering:

1. DEF pressure is below the set value of 440Kpa

2. DEF pressure < (reference pressure minus 100Kpa)

- After the above conditions are met, the FC3574 will be triggered for 20 seconds.

FC3574

System Response

The system will attempt to re-establish pressure to keep the pump in normal operation, or perform up to 3 re-prefills.

During the first two re-prefilling processes, the return valve will be opened and closed several times.

The last repre-injection will perform a full pre-injection that includes a quick drain. - If the system can pre-fill successfully but still cannot maintain pressure above 440Kpa during injection, the fault code with low DEF pressure will be set to current. - The system will empty and stay in the ERROR state until the ignition switch is off.

FC3574 Diagnosis and elimination procedures

Possible causes of the fault:

-DEF The liquid level is too low

- Metering pump suction pipe resistance, blocked, frozen or damaged

- Metering pump suction pipe joint resistance is large, blocked

-DEF tank filter resistance is large or blocked

- The main filter element of the metering pump has large resistance or blockage

- Metering pump motor failure (speed is too slow)

- Injection valve leak

- The return valve is always open

- Internal leakage of metering pump

The fault code is not the current method

For the reasonableness check of the sensor, after the above faults are eliminated, the fault code can be changed to non-current after the loading test of the metering pump.