B1778 Diagnostic Trouble Code

B1778 is a kind of OBD-II Diagnostic B-Body 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 B1778 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 :

A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Some aftermarket accessories and performance modifications
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 :

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. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code B1778 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 B1778.

Fortunately, B1778 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1778 Trouble Code For Specific Cars

B1778 Smart Forfour Lamp Air Bag Warning Indicator Circuit Failure
B1778 Mazda Mazdaspeed Turbocharger Boost Sensor A Circuit Range/Performance
B1778 Great Wall Peri Passenger Seat Occupant Detection Circuit Open
B1778 Bmw C 650 Gt Climate Control Pushbutton Circuit Failure
B1778 Mazda 121 Transmission Transfer Case Contact Plate 'A' Short Circuit To Battery
B1778 Honda Shuttle Remote Keyless Entry Out of Synchronization
B1778 Ac 3000 A/C Request Signal Circuit Short to Ground