What does error code P1391 mean?
What the P1391 Code Means. P1391 is an error code predominantly referring to an issue with either your Camshaft Position (CMP) Sensor, Crankshaft Position (CKP) Sensor, or both.
Where is the crank sensor on a 2004 Jeep Grand Cherokee?
Locate the crankshaft position sensor. It’s located on top of the transmission’s bell housing, under the firewall. This is a very tight squeeze, so you will need to use your ratchet with plenty of extension to reach it.
What’s a camshaft sensor do?
The camshaft sensor enables the engine control to determine the exact position of the crankshaft drive. This information is required to calculate the ignition point and injection point, among other things.
What is a crank sensor do?
A crank sensor is an electronic device used in an internal combustion engine, both petrol and diesel, to monitor the position or rotational speed of the crankshaft. This information is used by engine management systems to control the fuel injection or the ignition system timing and other engine parameters.
Where is the crank sensor on a 98 Jeep Cherokee?
The CPS is located on the driver’s side of the bell housing for 4.0 engines, and on the passenger’s side for the 5.2 and 5.9 engines. Figure 2. CPS sensor location on a 4.0 engine. It will be easiest to access the sensor from under the vehicle, in the gap between the firewall and the engine.
Where is the crank sensor located on a Jeep Cherokee?
Locate the crankshaft position sensor on the driver side of the bell housing, about half way down. It is secured with two 7/16-inch bolts and has a cable that runs up and onto the engine.
How do I know if my camshaft position sensor is bad?
If your vehicle idles roughly, stalls frequently, has a drop in engine power, stumbles frequently, has reduced gas mileage, or accelerates slowly, these are all signs your camshaft position sensor could be failing.
How do I know if my camshaft is bad?
6 Symptoms of a Bad Camshaft
- Active check engine light.
- Loud ticking or tapping sounds.
- Metal debris in the engine oil.
- Cylinder misfire.
- Increased emissions as a result of misfiring.
- Visible signs of damage.
How do I know if my crank sensor is bad?
5 Signs of a Failing Crank Sensor
- Crank Sensor Problems Could Make it Hard to Start Car. One sign that your crankshaft sensor might be failing is if you find it hard to start your vehicle.
- Engine Vibration Issues.
- Fuel Economy Slippage.
- Uneven Acceleration.
- Check Engine Light On.
- Don’t Ignore Signs Signaling Possible Issues.
What happens if crankshaft sensor goes bad?
If the crankshaft position sensor or its wiring have any issues, it can cause the crankshaft signal to be cut off while the engine is running, which can cause the engine to stall. This is usually a sign of a wiring problem.
What is a CPS on a Jeep Cherokee?
The CPS is responsible for reading the location and speed of the crankshaft and sending that information to the Jeep’s central processing unit (CPU), where the information is used to calculate spark timing for the ignition system.