C1978 Trouble Code

View C1978 obd/2 error code description and symptoms. C1978 engine photo

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.

Regardless of the design though, the purpose of all clutch actuating systems is to improve the driving experience by removing the need for manual clutch operation by the driver. Computer-controlled clutch actuating systems work particularly well in dual clutch systems where one clutch controls gear changes of even-numbered gear ratios, and a second clutch that controls gear changes of odd-numbered ratios.

C1978 Error Code Repair Process :

If your vehicle failed a C1978 test and the C1978 Check Engine Light is NOT on, chances are you have a problem with the OBDII system, a burned out MIL lamp, or a faulty catalytic converter. The converter is essentially an afterburner that cleans up the exhaust after it exits the engine. The OBDII system uses cooling fan circuit over current a ownstream oxygen sensor to monitor the efficiency of the converter, and it should detect a drop in converter efficiency if the converter has been contaminated or is failing (ignition misfiring, leaky exhaust valves, and oil burning can all damage the converter). What you want to look cooling fan circuit over current: Any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression. Use your OBD Express DIY to look at the oxygen sensor outputs, coolant temperature, airflow, calculated engine load, and inlet air temperature.

C1978 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

Common Causes of C1978

A common cause of code C1978 is the failure of Cooling Fan Circuit Over Current, but there are several other possible causes as well, such as ;

Camshaft Position Sensor harness is open or shorted
Faulty Crankshaft Position Sensor (POS)
Faulty select solenoid
Faulty ignition coil (s)

C1978 code for all cars

You can view according C1978 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+C1978 Fbs Census

+C1978 Salmson 18

+C1978 Volkswagen Touran I

+C1978 Talbot-lago 2500

+C1978 Ford Puma

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

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