Технический бюллютень компании Крайслер
Номер: 18-57-89
Дата: 29 декабря 1989

Двигатель 4 литра не заводится, заводится трудно или периодически глохнет

4.0L engine no-start, hard restart, or an engine die-out

Модели:

(MJ) Comanche 1989
(XJ) Cherokee 1989

SYMPTOM/CONDITION

Some 19B9 vehicles equipped with the 4.0L engine and automatic transmission may experience an engine no-start, hard restart, or an engine die-out. This condition may be caused by low signal strength from the crank position sensor due to a larger than desired distance to the flywheel sensing ring.

DIAGNOSIS

Check to see if the vehicle has a slotted crank position sensor:

1. If the vehicle is equipped with a slotted crank position sensor (see Figure 1), check to see if the CPS grommet on the top of the transmission bell housing has been updated (see Figure 2). If the CPS grommet has not been updated, replace the CPS grommet per the Repair Procedure outlined below.

If the vehicle has a slotted crank position sensor and new CPS grommet, do not install a new

sensor, but reinstall the slotted sensor that was on the vehicle and verify that it is good using

procedures in the 19B9 Jeep Seivice Manual B1-370-9045 on page 14-B7.

2. If the vehicle does not have a slotted crank position sensor already installed, then proceed with the Repair Procedure.

PARTS REQUIRED

1 Crank Position Sensor (slotted) PNB3100067 1 Crank Position Sensor Grommet (dust cover) PNB310006B

REPAIR PROCEDURE

1. Turn the ignition switch to the "OFF" position.

2. Disconnect the Crank Position Sensor (CPS) from the engine harness.

3. Raise the vehicle using a lift.

4. Remove the old CPS and grommet.

5. Install the new CPS grommet.

NOTE: THE NEW CPS GROMMET MUST BE REPLACED SO THAT THE MAXIMUM SIGNAL OUTPUT CAN BE OBTAINED FROM THE NEW CRANK POSITION SENSOR.

6. Install the new Crank Position Sensor and loosely attach the retaining bolts.

7. Firmly press down on the slotted hole side of the CPS until it bottoms on the machined lip of the bellhousing. While holding the CPS down against the bellhousing, tighten the bolt on the slotted side of the CPS to I6 ft.lbs.

8. Tighten the remaining attaching bolt to 16 ft.lbs.

NOTE: MAKE CERTAIN THAT THE CRANK POSITION SENSOR IS COMPLETELY BOTTOMED ON THE MACHINED LIP OF THE BELLHOUSING AND IS AS CLOSE AS POSSIBLE TO THE FLYWHEEL SENSING RING WITHOUT CONTACTING IT.