The CMP sensor, also known as the Cylinder Identification (CID) sensor, provides camshaft position information, called the CMP or CID signal, which is used by the Powertrain Control Module (PCM) for fuel and ignition system synchronization.
The sensor is located at the front of the engine in the bore formerly occupied by the distributor.
See Figure 1
- Check voltage between the camshaft position sensor terminals PWR GND and CID.
- With engine running, voltage should be greater than 0.1 volt AC and vary with engine speed.
- If voltage is not within specification, check for proper voltage at the VPWR terminal.
- If VPWR voltage is greater than 10.5 volts, sensor may be faulty.
REMOVAL & INSTALLATION
See Figures 2, 3, 4, 5, 6, 7 and 8
- Rotate the engine so that the No. 1 piston is at TDC of the compression stroke and the timing pointer is at 0 degrees on the scale.
- Matchmark the position of the camshaft position sensor electrical connector.
- Disconnect the negative battery cable.
- Disconnect the fuel charging electrical harness from the CMP sensor.
- Remove the CMP sensor retaining screws and lift the sensor from the housing.
If the CMP housing is to be removed, proceed as follows:
- Remove the housing hold down clamp.
- Lift the sensor housing and oil pump intermediate shaft from the engine as an assembly.
When replacing the CMP housing with a new housing, the replacement should contain a plastic locator cover tool. If the plastic cover tool is missing, a special service tool must be obtained prior to installation of the replacement sensor. Failure to follow this procedure will result in improper camshaft position sensor alignment. This will result in the ignition system and fuel system being out of time with the engine and possibly cause severe engine damage.
If the plastic locator cover tool is not attached to the replacement camshaft position sensor, attach Syncro Positioning Tool (T95T-12200-A ) for a 3.0L engine or (T89T-12200-A ) for a 3.8L engine as follows:
- Engage CMP sensor housing vane into the radial slot of the tool.
- Rotate tool on CMP sensor housing until tool boss engages notch in CMP sensor housing.
- Transfer oil pump intermediate shaft from old CMP sensor housing to replacement housing.
- Install CMP sensor housing so drive gear engagement occurs when arrow on locator tool is pointed approximately as shown in the illustrations. This step should align the CMP sensor electrical connector with the matchmark made during removal.
- Install the hold down clamp and tighten bolt to 15-22 ft. lbs. (20-30 Nm).
- Remove the syncro positioning tool.
- Install the CMP sensor and retaining screws. Tighten the sensor screws to 22-31 inch lbs. (3-4 Nm) for a 3.0L engine or 40-62 inch lbs. (5-7 Nm) for a 3.8L engine.
- Conenct CMP sensor wiring harness.
- Connect the negative battery cable.