U0904 Mercury Roadster OBD Code

OBD/2 U0904 error code description and symptoms.

Engine Coolant Temperature (ECT) Circuit High Input Indicates the sensor signal is greater than Self-Test maximum. The ECT sensor maximum is 4.6 volts or -50 C (-58 F). Note on some vehicles that are not equipped with an ECT sensor, CHT can be used and can set this DTC. Open circuit in harness Sensor signal short to power Damaged PCM Improper harness connection Damaged sensor ECT V PID reading greater than 4.6 volts with key ON and engine OFF or during any engine operating mode indicates a hard fault.

At this point we are assuming that the fuses and relays are good. You will need to locate the PCM/TCM and the power input signal circuit using your vehicle information source. Unplug the connector from the PCM/TCM, place the ignition switch in the ON position, and probe the appropriate circuit with the positive test lead of the DVOM.

U0904 Mercury Roadster Error Code Repair Process :

If your evaporative emission control system leak detected 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 U0904 and engine control unit are in charge of monitoring a bunch of different evaporative emission control system leak detected, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Mercury Roadster U0904 OBD2 Code

A common cause of code U0904 is the failure of Evaporative Emission Control System Leak Detected, but there are several other possible causes as well, such as ;

Engine Control Module (ECM)
Erratic camshaft position due to low oil pressure
Continuous oil flow to the VCT piston chamber
Exhaust gas leaks

U0904 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.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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U0904 Mercury Roadster OBD Code

U0904 Mercury Roadster Error Code Repair Process :

Common Causes of Mercury Roadster U0904 OBD2 Code

U0904 code for other Mercury cars