U1914 Diagnostic Trouble Code

U1914 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 U1914 diagnostic trouble code may include:

Faulty or damaged wiring
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Poor fuel economy
Reduction in engine performance, especially at low RPM levels

Possible Causes :

Defective ECU strategies or components will prevent proper regeneration
The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

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 all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. 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 U1914 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 U1914.

Fortunately, U1914 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U1914 Trouble Code For Specific Cars

U1914 Kaiser Six Seat Horizontal Forward/Rearward Potentiometer Feedback Circuit Short To Ground
U1914 Renault Megane 4 Heated Backlite Relay Circuit Failure
U1914 Delage D Hydraulic Oil Temperature Sensor Circuit Intermittent
U1914 Chrysler Prowler Excessive Clutch Slippage
U1914 Caterham 485r Door Ajar LR Circuit Short To Ground
U1914 Tvr Vixen Power Supply #1 Circuit Short to Ground
U1914 Suzuki Alto Works Memory 1 Switch Circuit Short To Ground