U0340 Swallow Doretti Mk Diagnostic Trouble Code

U0340 Swallow Doretti Mk code definition:
U0340 is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code for Swallow Doretti Mk.

U0340 Swallow Doretti Mk is described as Intake Air Temperature (IAT) Circuit Malfunction. It's actually a general trouble code for a problem on IAT electrical circuit sensor, as it sends incorrect voltage input signals to the PCM. Other symptoms that may indicate this problem are when the Check Engine Light illuminates and when there is a visible lack of engine power.

Symptoms

Symptoms of a U0340 Swallow Doretti Mk diagnostic trouble code may include:
  • Vacuum leak on the engine
  • Reduction in engine performance, especially at low RPM levels
  • Engine surge
  • If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Place of U0340 in engine

Possible Causes :

  • Fuel with a large percentage of sulfur will clog the DPF quickly
  • The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
  • Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Common Misdiagnoses

  1. Crankshaft Position Sensor Circuit Performance Problem
  2. TP Sensor Learn Not Complete Problem
  3. Low Coolant Circuit Problem
  4. Cruise Control System - Vehicle Accel Too High Problem
  5. Kick-Down Switch Failed Short Problem

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code U0340 Swallow Doretti Mk is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before U0340 Swallow Doretti Mk.

Fortunately, U0340 Swallow Doretti Mk is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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