Oil Pump Drive and CMP Sensor

4.0L CMP Location:

The Camshaft Position Sensor (CMP) on the 4.0L 6-cylinder engine (2) is bolted to the side of the oil pump drive shaft housing assembly (5).

NOTE: Do not attempt to rotate the oil pump drive assembly to modify ignition timing.

Two different procedures are used for removal and installation. The first procedure will detail removal and installation of the sensor only. The second procedure will detail removal and installation of the sensor and oil pump drive shaft assembly. The second procedure is to be used if the engine has been disassembled.

REMOVAL
If the CMP and oil pump drive are to be removed and installed, do not allow engine crankshaft or camshaft to rotate. CMP sensor relationship will be lost.

4.0L CMP Location:

1. Remove two plastic cover screws (7) and remove plastic cover (6).

4.0L CMP Removal/Installation:

2. Note and mark rotational position of target wheel (4) in relationship to housing (5).
3. Disconnect CMP electrical jumper harness (3) at engine wiring harness.
4. Before proceeding to next step, mark and note rotational position of oil pump drive housing (5) in relationship to engine block. After installation, the CMP sensor should face the 4 o'clock position as viewed from right side of engine.
5. Remove hold-down bolt (4) and clamp.
6. Pull assembly from engine.
7. Remove and discard old oil pump drive-to-engine block gasket.

INSTALLATION
1. Clean oil pump drive mounting hole area of engine block.
2. Install new oil pump drive-to-engine block gasket.

4.0L CMP Factory Alignment Pin:

3. If installing a new oil pump drive assembly, it is supplied with a temporary alignment pin (2) to prevent the target wheel from rotating. Do not remove this pin until oil pump drive assembly (1) has been installed.

4.0L CMP Target Wheel Alignment:

4. If installing/returning a used oil pump drive assembly back to the engine, temporarily install a small screwdriver (1) or similar tool through target wheel access hole (2) and then through mating hole in housing (3).
5. Install oil pump drive into engine while aligning into slot on oil pump. Rotate oil pump drive housing back to its original 4 o'clock position as viewed from right side of engine. Install hold-down clamp and bolt. Tighten bolt.
6. If engine crankshaft or camshaft has been rotated, such as during engine tear-down, CMP sensor relationship must be reestablished.
a. Remove ignition coil rail assembly. Refer to Ignition Coil Removal/Installation.
b. Remove cylinder number 1 spark plug.
c. Hold a finger over the open spark plug hole. Rotate engine at vibration dampener bolt until compression (pressure) is felt.

Align Timing Marks - 4.0L Engine:

d. Slowly continue to rotate engine. Do this until timing index mark (1) on vibration damper pulley aligns with top dead center (TDC) mark (0 degree) on timing degree scale. Always rotate engine in direction of normal rotation. Do not rotate engine backward to align timing marks.
e. Install oil pump drive into engine while aligning into slot on oil pump. If pump drive will not drop down flush to engine block, the oil pump slot is not aligned. Remove oil pump drive and align slot in oil pump to shaft at bottom of drive. Install into engine. Rotate oil pump drive housing back to its original 4 o'clock position as viewed from right side of engine. Install hold-down clamp and bolt.
f. Remove small screwdriver, or, factory alignment pin from housing and install plastic cover (two screws).
7. Install CMP sensor to oil pump drive.
8. Install sensor mounting bolt and tighten to 2 N.m (15 in. lbs.) torque.
9. Connect CMP electrical connector to engine wiring harness.
10. If removed, install spark plug and ignition coil rail.
11. Connect DRB scan tool to data link connector. The data link connector is located in passenger compartment, below steering column.
12. Gain access to "CAM/CRANK RELEARN" screen on DRB scan tool.