C0700 Bmw 740 Diagnostic Trouble Code

C0700 Bmw 740 Diagnostic Trouble Code C0700 Bmw 740 code definition: C0700 is a kind of OBD-II Diagnostic C-Chassis Diagnostic Trouble Code for Bmw 740.

C0700 Bmw 740 or the Evaporative Emission Control System Incorrect Purge Flow is the set whenever the computer sees that there is a problem with the flow coming from the purge valve or the purge flow is not enough within the EVAP system. There are two wires dedicated for each coil; one is battery feed which usually comes from the distribution center, and the other one for the coil driver circuit from the PCM. The PCM grounds or ungrounds the circuit to activate or deactivate the coil.

Symptoms

Symptoms of a C0700 Bmw 740 diagnostic trouble code may include:

• Blown fuse (if applicable)
• Engine surge
• Reduction in engine performance, especially at low RPM levels
• 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. Dirty air cleaner element Damaged DPF

Common Misdiagnoses

1. Control Module Throttle Actuator Position Performance Problem
2. Air Conditioning (A/C) Clutch Feedback Circuit High Voltage Problem
3. Cruise Vehicle Speed/Set Speed Difference Too High Problem
4. Kick-Down Switch Failed Short Problem
5. Park/Neutral Postion (PNP) Switch Circuit Engine Torque Signal Circuit Problem

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. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. 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 C0700 Bmw 740 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 C0700 Bmw 740.

Fortunately, C0700 Bmw 740 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.