B3647 Diagnostic Trouble Code

B3647 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 B3647 diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
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

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.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

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. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code B3647 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 B3647.

Fortunately, B3647 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B3647 Trouble Code For Specific Cars

B3647 Alfa Romeo 1750 ABS Power Relay Output Circuit Failure
B3647 Datsun 1000 Heater Blower Relay Circuit Failure
B3647 Saturn Vue Inertia Switch input Circuit Open
B3647 Italdesign Nazca
B3647 Bianchi S Brake Pedal Input Circuit Ground Short
B3647 Citroen Eole Fuel level Sensor Circuit Intermittent
B3647 Mitsubishi Minica Aux A/C Blower Speed 2 Circuit Short to Ground