The M/L model vehicles equipped with 4.3L (VIN W) engine use the HVI system. The "distributor" is called the High Voltage Switch (HVS). System is also referred to as the HVI/HVS system. The HVS includes a camshaft position sensor.
| CAUTION | HVS ("distributor") is installed in a fixed, nonadjustable position. Base timing is computer controlled and cannot be adjusted by rotating HVS. Attempting to do so may result in crossfire and misfire conditions. If HVS is installed incorrectly a DTC 1345 may be set. |
Removal
- Ensure ignition is off. Disconnect spark plugs and coil leads from HVS cap. Disconnect 3-wire camshaft position sensor plug from base of HVS. Remove 2 screws holding cap to HVS housing.
- Mark HVS cap with a grease pencil to indicate position of rotor to housing. Loosen mounting clamp hold-down bolt and slide clamp back.
- Remove HVS. (Scheme 13) When HVS is being removed rotor will rotate approximately 42 degrees. Place a second mark at this position for reassembly reference. If the original HVS is being replaced, transfer marks made during removal to replacement component.
Installation
Note. If engine crankshaft has been rotated since HVS was removed, marks made during removal to aide installation are no longer valid. If this condition exists, start installation procedure at Step 4 ).
- Align rotor to second mark made during removal. Guide HVS into engine. Ensure rotor rotates approximately 42 degrees during installation. When HVS is completely seated in position ensure rotor aligns with initial mark made during removal.
- If rotor and mark are not aligned, HVS and camshaft have meshed one or more teeth out of time. Remove HVS and reinstall. Once marks are aligned and HVS is in correct position, position mounting clamp and tighten to 20 ft. lbs. (27 N.m).
- Install cap and 3-wire camshaft position sensor connector. Connect spark plug and coil wires. Start engine. If CHECK ENGINE LIGHT is on or DTC 1345 is set, go to next step to check or reset distributor position. If not, installation is correct.
- Position engine crankshaft at TDC position for No. 1 cylinder. Ensure piston is on compression stroke. Align pre-drilled indent hole in HVS driven gear with arrow cast into upper portion of shaft housing. The rotor should point to the cap hold down mount nearest the flat side of the housing. (Scheme 14)
- Use a long screwdriver to align oil pump drive shaft position, in engine, with position of HVS drive tab. Guide HVS into place. Ensure locating slot in HVS base is over dowel pin.
- With HVS fully seated, ensure rotor tip is now aligned with pointer cast into HVS base. (Scheme 14) Pointer has a "6" cast into it (to indicate unit is for a 6-cylinder engine). If rotor and pointer are not closely aligned (within a few degrees), HVS may be out of time by a tooth. Repeat installation procedure.
- Once marks are aligned and HVS is in correct position, position mounting clamp and tighten to 20 ft. lbs. (27 N.m). Install cap and 3-wire camshaft position sensor connector. Connect spark plug and coil wires.
- Start engine. If CHECK ENGINE LIGHT is on or DTC 1345 is set, check distributor position and installation procedure.
