C/C SPEED INTERMITTENTLY FLUCTUATES AT HIGHWAY SPEED. Saturn Saturn 1995

For 1990-2009 cars

# C/C SPEED INTERMITTENTLY FLUCTUATES AT HIGHWAY SPEED

#### SUBJECT: Cruise Control Speed Intermittently Fluctuates at Highway Speeds Under Certain Conditions (Replace Cruise Control Module Assembly)

#### MODELS AFFECTED: 1991 - 1995 Saturns equipped with cruise control

CONDITION: Some customers may comment that their vehicle speed fluctuates when driving at speeds above 103 km/h (64 mph) with the cruise control engaged.

CAUSE: When the cruise control is engaged at speeds between 103 and 117 km/h (64 and 73 mph), the cruise control calibration may cause speed fluctuations. The speed may fluctuate more on a hilly terrain.

#### CORRECTION:

---------- Inspect cruise control module assembly for part number printed on label. Use a mirror in order to view the right side of the cruise control module assembly. NOTE: The right side of the cruise control module assembly is the side that faces the HVAC module. If the part number on the label of the cruise control module assembly has one of the following affected part numbers, proceed to "Procedure" in this bulletin and replace the cruise control module assembly.

CRUISE CONTROL MODULE ASSEMBLY PART NUMBERS AFFECTED BY THIS BULLETIN

21021828 21022440

21021829 21022441

If the part number on the label of the cruise control module assembly has one of the following non-affected part numbers, refer to diagnostics in the "Cruise Control" section of the "Electronic Engine Controls Service Manual."

CRUISE CONTROL MODULE ASSEMBLY PART NUMBERS NOT AFFECTED BY THIS BULLETIN

21021001 21023385 21021002 21023386 21021521 21023387

#### PROCEDURE:

--------- 1. Make sure ignition is Off.

2. Remove connector and disconnect cruise control module assembly electrical connector.

3. Disconnect cruise control module assembly cable from accelerator pedal.

4. Remove nuts attaching cruise control module assembly to steering column bracket and remove cruise control module assembly. Make sure to leave rubber isolator grommets in place.

5. Install new cruise control module assembly to steering column bracket using three nuts. Refer to "Part Requirements" in this bulletin for the correct cruise control module assembly part number to use.

#### IMPORTANT: When installing the cruise control module assembly, make sure that the rubber grommets are in place on the steering column bracket and that the cruise control module studs go through the rubber grommets.

Torque: 5 N-m (44 in-lbs)

6. Connect cruise control module assembly cable to accelerator pedal.

7. Connect cruise control module assembly electrical connector.

#### CAUTION:

ADJUST CRUISE CONTROL MODULE ASSEMBLY CABLE EACH TIME CRUISE CONTROL MODULE ASSEMBLY IS REMOVED OR REPLACED. THROTTLE OPERATION COULD BE AFFECTED.

8. Connect portable diagnostic tool (PDT) to data link connector (DLC).

9. While observing the PDT, gently pull the cruise control module assembly cable adjuster out and turn the adjuster assembly to lengthen or shorten the cruise cable. The cable should be adjusted until the throttle plate is closed. When the throttle plate is closed the PDT will display "O TP SENSOR %."

o Turn clockwise, when facing the throttle pedal, to shorten the cruise control module assembly cable.

o Turn counterclockwise, when facing the throttle pedal, to lengthen the cruise control module assembly cable.

10. Once the cruise control module assembly cable is adjusted so that "O TP SENSOR %" is achieved, turn the cruise control module assembly cable adjuster counterclockwise, when facing the throttle pedal, 1/2 turn (two or three clicks) to allow slack in the cruise control module assembly cable.

#### IMPORTANT: When correctly adjusted, the cruise control module assembly cable should have 1-2 mm (0.040-0.079 in.) of free play (fore/aft movement).

11. Disconnect PDT from DLC.

12. Verify cruise control system operation.

#### PARTS REQUIREMENTS:

Model Year Part Engine Number Application Description -------------------------------------------------- 94-95 21023385 All Module Asm - Crcont 91-93 21023386 LKO Module Asm - Crcont 91-93 21023387 LLO Module Asm - Crcont

CLAIM INFORMATION: To receive credit for this repair during the warranty coverage period, submit a claim through the Saturn Dealer System as follows:

Labor Case Operation Type Description Code Time -------------------------------------------------- VW Module, Cruise R1220 0.5 hrs Control-Replace

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.