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FC4238 Low injection air auxiliary pressure detected in metering pump

(Mixing chamber pressure diagnosis)

Prerequisites for diagnostic operation:

Injection metering phase

· Conditions for fault code trigger:

1. The mixing chamber pressure is lower than the set value

- The FC4238 will be triggered for 20 seconds after the above conditions are met.

The system response forbids leakage.

A post-processing system will empty and then stay in the Error state

- The system will always monitor the error status, and if the fault code trigger condition no longer exists (mixing chamber pressure =330~430Kpa), the system error status will be restored.

FC4238 Diagnosis and elimination procedures

Possible causes of the fault:

- Air supply line resistance or blockage

- The air supply line is damaged

One body air supply pressure is insufficient

- The air path in the metering pump is blocked

-DEF jet pipe leak

-ASOV adhesions are usually closed

-ASOV Internal damage

Fault code not 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.

Low DEF pressure detected in FC3574 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.