P3978 Willys-overland Rural OBD Code

OBD/2 P3978 error code description and symptoms.

Output Shaft Speed sensor circuit intermittent failure The output shaft speed sensor signal to the PCM is irregular or interrupted.
Harness connector not properly seated Harness intermittently shorted, or open Harness connector damaged OSS sensor damaged, or not installed properly Verify harness and connector integrity Verify OSS sensor proper installation.

As long as the throttle plate remains closed, the idling speed and quality is controlled by the PCM via the idle control valve, and as can be seen from the above it should be clear that idle control on a gasoline engine is a complex affair. For instance, if the engine is started in sub-zero temperatures, the PCM will command the idling control valve to allow less air to enter the engine to enrich the air/fuel mixture to create a condition which is roughly analogous to how chokes worked on carburetted engines to control idling in cold weather.

P3978 Willys-overland Rural Error Code Repair Process :

The scent may P3978 signal oil or coolant leaking from their normally closed-loop systems, or it may indicate dangerous exhaust gases invading your car's interior. Car and truck exhaust contains toxic gases such P3978, so if the inside of your car scp (j1850) invalid or missing data for wheels as if you were standing behind your car, get out and get it fixed. Fight the urge to take a little nap first. So sleepy. That's the carbon monoxide talking, friends. At least open a window on your way to the shop.

Common Causes of Willys-overland Rural P3978 OBD2 Code

A common cause of code P3978 is the failure of SCP (J1850) Invalid or Missing Data for Wheels, but there are several other possible causes as well, such as ;

Camshaft Position Sensor harness is open or shorted
Faulty Air Flow Meter
Engine Control Module (ECM)
Clogged or faulty fuel injector (s)

P3978 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.

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

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P3978 Willys-overland Rural OBD Code

P3978 Willys-overland Rural Error Code Repair Process :

Common Causes of Willys-overland Rural P3978 OBD2 Code

P3978 code for other Willys-overland cars