U3734 Diagnostic Trouble Code

U3734 is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a U3734 diagnostic trouble code may include:

Hesitation upon acceleration
Excessive exhaust leak
Rich or lean exhaust
Engine surge

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Some aftermarket accessories and performance modifications

Repair Processes :

Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

Process Tips

Diagnostic trouble code U3734 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 U3734.

Fortunately, U3734 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U3734 Trouble Code For Specific Cars

U3734 Peugeot 406 EIC Switch-1 Assembly Circuit Failure
U3734 Mazda Taiki A/C Evaporator Air Temperature Circuit High
U3734 Chrysler Town And Country Exhaust Pressure Control Valve Range/Performance
U3734 Isuzu Axiom SCP (J1850) Invalid or Missing Data for Steering Column
U3734 Volvo S70 SCP (J1850) Invalid or Missing Data for Experimental #2
U3734 Simca Montlhery Interior Lamp Override Switch Open Circuit
U3734 Maserati Kyalami Transmission Fluid Pressure Sensor/Switch E Circuit Range/Performance