P3691 Bmw M2 OBD Code

OBD/2 P3691 error code description and symptoms.

Low Speed Fuel Pump Primary Circuit Malfunction The PCM monitors the low speed fuel pump (LFP) primary circuit output from the PCM.
The test fails if: When the LFP circuit is commanded on (grounded), excessive current draw is detected on the LFP circuit; or when the LFP circuit is commanded off, voltage is not detected on the LFP circuit (the PCM expects to detect VPWR voltage coming through the low speed fuel pump relay coil to the LFP circuit). Open or shorted low fuel pump (LFP) circuit Open VPWR to low speed fuel pump relay Damaged low speed fuel pump relay Damaged PCM An open circuit or short to ground can only be detected with the low speed fuel pump.

Circuit High Input codes like P3691 are mostly caused by defective alternators that develop excessive voltages, although there may be other causes as well, such as short circuits that 'leak' current into a particular system from other, unrelated systems that work on higher voltages. Note that in the case of short circuits that leak power into a control circuit, there is likely to be other, seemingly unrelated trouble codes present along with the code(s) being investigated. Diagnosing a 'high input' code will always involve a thorough testing of the charging system as a first step, followed by measures to isolate the system from all other possible sources of power during resistance, continuity, and reference voltage tests.

P3691 Bmw M2 Error Code Repair Process :

If your left front vertical accelerometer circuit failure check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system P3691 and engine control unit are in charge of monitoring a bunch of different left front vertical accelerometer circuit failure, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Bmw M2 P3691 OBD2 Code

A common cause of code P3691 is the failure of Left Front Vertical Accelerometer Circuit Failure, but there are several other possible causes as well, such as ;

EVAP canister or fuel tank leaks
Exhaust gas leaks
Faulty Camshaft Position Sensor
Variable Camshaft Timing solenoid stuck open

P3691 is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

P3691 Bmw M2 OBD Code

P3691 Bmw M2 Error Code Repair Process :

Common Causes of Bmw M2 P3691 OBD2 Code

P3691 code for other Bmw cars