U1685 Trouble Code

View U1685 obd/2 error code description and symptoms. U1685 engine photo

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.

As the engine heats up and combustion becomes easier and more complete, the PCM will command the idling control valve to increase the amount of air entering the engine to suit the changing conditions. However, when the load on the engine changes, say, when some electrical consumers or other systems are either turned on or off, the PCM adapts the signal voltage to the idle control valve to ensure that the idling speed remains stable, and at the RPM specified by the manufacturer.

U1685 Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine U1685 light should flash briefly, indicating that the OBD system is ready to scan your vehicle for any malfunctions. After this brief flash, the light should stay off while you drive as long as no problems are detected. If lamp keypad output short circuit to battery so, you'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the lamp keypad output short circuit to battery.

U1685 is a kind of Network Trouble Code

U-code indicates that engine communication errors and shows lost communication with engine parts.U-Codes are fairly straight forward, given all of the articles and technical publications that have been written regarding these problematic codes. In most cases, it just comes down to identifying the module that isn't communicating with the other modules on the CAN bus line for whatever reason.

Common Causes of U1685

A common cause of code U1685 is the failure of Lamp Keypad Output Short Circuit To Battery, but there are several other possible causes as well, such as ;

EVAP canister or fuel tank leaks
Faulty ignition coil (s)
Insufficient cylinders compression
Incorrect fuel pressure

U1685 code for all cars

You can view according U1685 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+U1685 Paramount Ten

+U1685 Lincoln Mark Lt

+U1685 Marcos Mini

+U1685 Bmw 323

+U1685 Mazda Axela Ii

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