Throttle Body - High Effort to Move Accelerator Pedal
NO: 18-20-95 Rev. AGROUP: Vehicle Performance
DATE: Dec. 8, 1995
SUBJECT:
Increased Throttle Effort to Move Accelerator Pedal from Idle Position
Note:
This Bulletin supersedes Technical Service Bulletin 18-20-95 dated June 9, 1995 which should be removed from your files. Repair procedure (B) has been added to reprogram the Powertrain Control Module.
MODELS:
1995 (PL) Neon
SYMPTOM/CONDITION:
Increased effort required to move the accelerator pedal from the idle position.
DIAGNOSIS:
Inspect the accelerator pedal attachment, throttle cable routing and attachments at the throttle body. If there are no kinks, binds or other obstructions that would contribute to increased throttle pedal effort, proceed to the repair procedure.
EQUIPMENT/PARTS REQUIRED:
1 4318037 Mopar Brake Parts Cleaner
AR 4669034 Throttle Body Base Gasket (used only with vehicles equipped with
aluminum intake manifold)
1 NPN Scotch Brite Pad (Green) or Equivalent
1 CH6000 Scan Tool (DRB III)
1 CH7035 General Purpose Interface Bus Cable (GPIB)
1 CH7015 Engine Cable
1 4669020 Label - Authorized Software Update
1 4275086 Label - Authorized Modification
REPAIR PROCEDURE (A):
This bulletin involves removing the throttle body and cleaning any residue that has accumulated on the throttle blade and throttle body bore. In addition, this bulletin also involves erasing and reprogramming the Powertrain Control Module (PCM) with new software (calibration change).
1. Remove the throttle body from the engine.
2. While holding the throttle open, spray the throttle body bore with Mopar Brake Parts Cleaner, P/N 4318037. Spray the entire throttle body bore and the manifold side of the throttle blade.
NOTE:
Use only Mopar Brake Parts Cleaner P/N 4318037 as the use of other cleaners may damage components of the throttle body. Use this cleaner only in a well ventilated area. Do not let this cleaner come in contact with the skin. Rubber or butyl gloves are recommended. Wash thoroughly after use. Avoid eye contact. Avoid ingesting.
3. Use a small (1" x 1") piece of green Scotch Brite scuff pad to clean the throttle body bore and throttle blade. While holding the throttle open, clean both the top and bottom of the throttle body bore. Also clean the manifold side and edges of the throttle blade.
NOTE:
It is important this cleaning operation be performed thoroughly and completely. The edge of the throttle blade and the portion of the throttle body bore that is in the closest proximity of the closed throttle blade are the most critical areas where the cleaning should be concentrated. These areas must be free of all deposits when the cleaning is completed.
4. Spray the throttle body with Mopar Brake Parts Cleaner, P/N 4318037, and then blow dry with compressed shop air. Inspect for any foreign material which may have been left behind from the cleaning process.
NOTE:
Do not apply shop air pressure directly into the throttle shaft and throttle body housing holes.
5. Open and close the throttle blade on the throttle body to verify that there is no increased effort when moving from the closed position. If the condition is corrected, proceed to the next step. If the effort still exists, then some other condition exists with the throttle body and/or linkage and further diagnosis and repair will be necessary and will not be covered by this repair procedure.
6. Install the throttle body back on the engine.
NOTE:
The Mopar Diagnostic System (MDS) is required to perform the following repair and the system must be operating with release 18 or higher and TIL CD release 1095 or higher must be installed.
REPAIR PROCEDURE (B):
This repair involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (calibrations) which disables the EGR system below 10° F.
1. Connect the MDS (Mopar Diagnostic System) and DRB III (Scan Tool) to the vehicle and power them up.
2. Use the arrow keys and select # 2 MDS DIAGNOSTICS on the DRB III MAIN MENU Screen.
3. Use the arrow keys and select DIAGNOSTIC MENU on the MDS, then press NEXT MENU.
4. Use the arrow keys and select CONTROLLER PROGRAMMING on the MDS, then press NEXT MENU.
5. Use the arrow keys and select PROGRAM CONTROLLER PART on the MDS, then press NEXT MENU.
6. Follow the steps presented on the MDS and DRB III which will allow the DRB III to obtain the current part number of the PCM.
7. The MDS will display the part number of the PCM on the vehicle and the appropriate replacement part number, then press NEXT MENU to begin programming. If the PCM on the vehicle has already been updated or programmed, a NO UPDATES AVAILABLE message will be displayed. Check the part number of the PCM on the vehicle and compare it to the part number displayed. If the PCM has already been updated, then another condition exists that will require further diagnosis and repair.
8. The MDS and DRB III will prompt for any operator action needed during the remainder of the programming process.
NOTE:
The following steps are required by law.
9. Type the necessary information on the "Authorized Software Update Label" and attach it to the PCM and cover the label with a clear plastic sticker.
10. Type the necessary information on the Authorized Modification Label and attach the label near the VECI Label.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Throttle Body, Remove and Clean
Labor Operation No: 14-30-02-93 0.6 Hrs.
Remove and Clean 1995 PL
Residue from Throttle Body
and Bore
FAILURE CODE: XX - Service Adjustment
Powertrain Control Module Update
Labor Operation No: 08-19-43-91 0.5 Hrs.
Module, Powertrain 1995 PL
Control - Reprogram
FAILURE CODE: FM - Flash Module