Speed Control - Does Not Maintain Speed on Grades

NUMBER: 08-27-99

GROUP: Electrical

EFFECTIVE DATE: Aug. 27, 1999

SUBJECT:
Speed Control Does Not Maintain Set Speed While Climbing a Grade

OVERVIEW:
This bulletin involves replacing the battery tray/vacuum reservoir assembly because of speed control vacuum loss while on up hill grade.

MODELS:
1996 - 2000 (NS) Town & Country/Caravan/Voyager
1996 - 2000 (GS) Chrysler Voyager (International Market)

NOTE:
THIS BULLETIN APPLIES TO VEHICLES BUILT PRIOR TO SEPT. 1, 1999 AND EQUIPPED WITH SPEED CONTROL, SALES CODE NHM) AND A GASOLINE ENGINE.

SYMPTOM/CONDITION:
Vehicle loses more than 5 mph (8 kph) while climbing a grade with the speed control engaged because of a leaking check valve in the battery tray/vacuum reservoir assembly. The check valve traps vacuum in the reservoir to allow the speed control to work under low manifold vacuum conditions. The valve may become contaminated and cause it not to seal intermittently. This can cause a loss of vacuum to the servo while driving on a long up hill grade.





DIAGNOSIS:
Verify the ignition switch and all accessories are turned off. Disconnect the negative and positive battery cables. Remove the battery hold down (Figure 1). Remove the battery from the vehicle. Disconnect the vacuum line at the vacuum reservoir on the battery tray that goes to the speed control servo. Connect a hand held vacuum pump to the small/top nipple on the vacuum reservoir and apply 20 in. of vacuum. If the vacuum leaks down more than 2 in. in five minutes perform the Repair Procedure, if not look for other sources of vacuum leaks. If no other source of vacuum leak is found, perform the Repair Procedure.

PARTS REQUIRED:

1 04716740AB Tray, Battery/Vacuum Reservoir

EQUIPMENT REQUIRED:

Hand Vacuum Pump

REPAIR PROCEDURE:
THIS REPAIR IS COMPATIBLE WITH DAIMLERCHRYSLER'S MOBILE SERVICE PROGRAM AND DOES NOT REQUIRE HOISTS OR OTHER FULL SERVICE FACILITY SPECIAL EQUIPMENT.

1. Remove the nut and two bolts from the battery tray, Figure 1.

2. Remove the speed control servo attaching bolt from the battery tray.

3. Disconnect the vacuum lines from the battery tray vacuum reservoir.

4. Remove the battery tray from the vehicle and discard.

5. Connect the vacuum lines to the revised battery tray vacuum reservoir, p/n 04716740AB.

6. Attach the speed control servo to the battery tray. Tighten the bolt to 6 Nm. (50 in. lbs.).

7. Install the battery tray, tighten the nut and two bolts to 16 Nm. (140 in. lbs.).

8. Install the battery; tighten the hold down clamp bolt to 20 Nm (180 in. lbs.)

9. Connect the positive and negative battery terminals.

10. Set the clock to the correct time.

POLICY: Reimbursable within the provisions of the warranty.

TIME ALLOWANCE:

Labor Operation No: 08-08-05-90 0.3 Hrs.

FAILURE CODE: P8 - New Part