BMW Cars 1999-06

Cylinder Position Sensor

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Refer to Electronic Engine Controls in Section 4 for information on servicing the Cylinder Position (CYP) Sensor.

Refer to Electronic Engine Controls in Section 4 for information on servicing the Cylinder Position (CKP) sensor.

Operation



M20 And S14 Engines

The cylinder identifying sender, also referred to as a reference sensor, provides the Engine Control Module (ECM) with information on the relative engine position for a particular cylinder. A signal is produced that the ECM uses to begin the ignition and fuel injection cycles.

The M20 engines' sensor mounts on ignition lead for cylinder No. 6.

The S14 engines' sensor mounts on the transmission bell housing. The sensor on the S14 engine connects to a gray colored plug mounted in the center of a group of 3 plugs on the engine compartment rear wall, next to the engine harness connector and diagnosis socket.

Removal & Installation



M20 Engine
  1. The ignition switch must be in the OFF position.
  2.  
  3. Remove the distributor cap cover to expose the ignition leads. The sensor will be mounted on the ignition lead for cylinder 6. Disconnect cylinder 6 ignition lead from the distributor cap.
  4.  
  5. Trace the sensor lead back to the connector and disconnect. The S38 engine might require the fan and shroud be removed and the water pipe be moved out of the way to access the plug.
  6.  
  7. Cut the distributor connector off the lead and slide the sensor off. Alternately, the entire ignition lead may be replaced if the entire assembly is available as a single unit.
  8.  

To install:

  1. Slide the new sensor onto the ignition lead.
  2.  
  3. Strip off 1 / 4 in. (5mm) of insulation from the ignition lead end. Place a new coupling on the lead. Crimp the new coupling on the wire end first, then crimp the insulation end.
  4.  
  5. Remove the cut off wire from the distributor connector. Use tool 12 1 096 or equivalent to install the lead into the distributor connector.
  6.  
  7. Install the ignition lead and the distributor cover. Install the fan, shroud and water pipe on the S38 engine, if removed.
  8.  

S14 Engine
  1. The ignition switch must be in the OFF position.
  2.  
  3. The cylinder identifying connector is mounted on the left side of the bell housing. There is a shield mounted over the sensor with 2 bolts.
  4.  
  5. Remove the bolts and pull the sensor out of the bell housing.
  6.  
  7. Unplug the connector at the mounting bracket.
  8.  

To install:

  1. Install in the bell housing with the shield.
  2.  
  3. Tighten the mounting bolts to 4.5-5.5 ft. lbs. (6-8 Nm).
  4.  
  5. Plug in the connector and route the wire.
  6.  

Testing



M20 And S14 Engines

The cylinder identifying sender is mounted on the ignition lead for cylinder No. 6 on the M20 engine. The sender on the S14 engine is mounted in the bellhousing flange and connects to a gray colored plug mounted in the center of a group of 3 plugs on the engine compartment rear wall, next to the engine harness connector and diagnosis socket.

  1. Turn the ignition switch to the OFF position.
  2.  
  3. Trace the sensor lead back to the connector and disconnect.
  4.  
  5. Using a digital ohmmeter, check the resistance between terminal Nos. 1 and 2. The resistance should be 0.2-1.0 ohms.
  6.  

 
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