U1552 Saab 9-X Diagnostic Trouble Code

U1552 Saab 9-X code definition:
U1552 is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code for Saab 9-X.

U1552 Saab 9-X is described as Oxygen Sensor Circuit No Activity Detected Bank 2 Sensor 1. This code appears when the PCM (powertrain control module, also known as ECM or engine control module in other brands) remains at or close the 0.450 set voltage point. If the car doesn't start, they will proceed by testing the voltage at the fuel pump connector and see if the fuel pump relay, fuse, and PCM circuitry should be inspected.

Symptoms

Symptoms of a U1552 Saab 9-X diagnostic trouble code may include:
  • Blown fuse (if applicable)
  • Engine surge
  • Reduction in engine performance, especially at low RPM levels
  • Rich or lean exhaust
Place of U1552 in engine

Possible Causes :

  • Faulty IMRC actuator relay (if equipped)
  • A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
  • Dirty air cleaner element Damaged DPF

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 :

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.

Process Tips

Diagnostic trouble code U1552 Saab 9-X 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 U1552 Saab 9-X.

Fortunately, U1552 Saab 9-X is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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