X-Type Information
Diesel Camshaft Position Sensor - Jaguar Part Number JDE3763
(NB Petrol version is similar but different part numbers)
This document is a combination of advice gleaned from a variety of sources – hopefully it will be
helpful to you – no guarantees are offered or implied that it will be the answer you seek!
Function:
The Camshaft Position Sensor (CMP) is used to help the PCM (power-train control module)
determine the correct firing order. The engine will not run properly (sometimes not at all) without
this sensor’s input.
This sensor information is used to phase the sequential firing of the fuel injectors during normal
operation.
Electronic fuel injection systems rely on a number of sensors to control the delivery of the fuel and
air mixture to the engine. Of these the CMP uses the ‘Hall Effect’ principle to detect when a magnet
on the camshaft passes in front of it. Although it has no moving parts, the sensor is still subjected to
the extreme heat and vibration of the engine and will eventually fail over time.
Engine DTC codes:
Typical trouble codes:
P0340 - Camshaft Position Sensor Circuit Malfunction
P1336 - Crankshaft/Camshaft Sensor Range/Performance
Possible causes:
1. Bad sensor
2. Dirt or other contamination on the face of the sensor
3. Sensor disconnected
4. Wiring fault - such as a break or short circuit (where one of the wires is either
touching earth or is touching power). To check means examining the wiring for
damage due to a cable rubbing up against something.
5. Damaged connectors - may need to pull the pins out for cleaning. It is not
unknown for water to get inside and cause problems.
Symptoms:
A failing sensor can illuminate the MIL, and may cause any or all of these:
Extended cranking time with a cold engine
Intermittent rough running
Unstable idle
Hesitation
Poor fuel economy
Stalling on acceleration
Occasional loss of power while driving (flashing glow plug light while coasting to a
stop)
Sometimes starts first time after power loss
Sometimes it could take 5 to 10 minutes for it to start
Noisy Engine
(If it doesn't start then the glow plug light will be flashing)
Cure:
Replacing the defective sensor will usually resolve such problems.
