CAMPAIGN: 4.9 LITER ENGINE PCM MEM-CAL/PROM REPLACEMENT

PRODUCT EMISSION CAMPAIGN

SUBJECT: 95-C-72 - 4.9 LITER ENGINE PCM MEM-CAL/PROM REPLACEMENT ------------------------------------------------------

MODELS: CERTAIN 1991-1995 CADILLAC VEHICLES EQUIPPED WITH 4.9 LITER ENGINE (RPO L26) ------------------------------------------------------------

The Administrator of the U. S. Environmental Protection Agency (EPA) has determined that 1991-1995 model Cadillacs equipped with 4.9 liter engines may require modifications in order to comply with requirements of the Clean Air Act designed to protect the public health and welfare. GM has determined that the modifications required by EPA will help reduce emissions of carbon monoxide and hydrocarbons, which are regulated by EPA under the Clean Air Act.

In October 1991, GM implemented a change in its production of 1992 model Cadillacs equipped with 4.9 liter engines that introduced an enrichment calibration to the fueling strategy. This calibration was subsequently included in production of 1993-1995 model Cadillacs equipped with 4.9 liter engines and in service parts received by certain 1991- 1992 model Cadillacs equipped with 4.9 liter engines. The United States alleges that this calibration has a detrimental effect on a vehicle's emission control system and that this calibration was not adequately reported to the EPA.

General Motors has agreed to modify the fueling strategy for these vehicles in a way that reduces the emission of air pollutants from the vehicles without compromising driveability. All vehicles that were built with the fueling strategy in question or which subsequently received the strategy through a service prom are being recalled to have the calibration inspected and, if necessary, revised via the installation of a new service prom.

VEHICLES INVOLVED

Certain 1991-1995 module Cadillac vehicles equipped with 4.9 liter engines (RPO L26) require inspection and/or replacement of the PCM Mem-Cal/Prom as indicated below. Note that vehicles equipped with 4.9 liter engines can be easily identified by the character "B" in the 8th position of the Vehicle Identification Number.

Inspect To Determine If PCM Mem-Cal/prom Replacement Is Necessary -----------------------------------------------------------------

Certain 1991 model C, E, and K vehicles that received a service prom through a previous warranty repair.

Certain 1992 model vehicles that received a service prom through a previous warranty repair and built prior to the following breakpoints:

C - 247931 E - 604014 K - 806500

Replace PCM Mem-Cal/Prom - Inspection Not-Necessary ---------------------------------------------------

All 1992 model vehicles built after the following breakpoints:

C - 247930 E - 604013 K - 806499

All 1993 model vehicles except Allante, Eldorado Touring Coupe, Eldorado Sport Coupe, Seville Touring Sedan and Fleetwood Sedan.

All 1994-1995 model DeVilles except those registered in the State of California. Note that DeVille Concours is n& included.

Notice: Since some vehicles did not receive a service prom through a previous warranty repair or are otherwise excluded from this recall, it is very important that dealers confirm vehicle eligibility through the Vehicle Information Service System (VISS) prior to performing this campaign.

Involved vehicles have been identified by Vehicle Identification Number. Computer listings containing the complete Vehicle Identification Number, customer name and address data have been prepared, and are being furnished to involved dealers with the campaign bulletin. The customer name and address data furnished will enable dealers to follow-up with customers involved in this campaign. Any dealer not receiving a computer listing with the campaign bulletin has no involved vehicles currently assigned.

These dealer listings may contain customer names and addresses obtained from State Motor Vehicle Registration Records. The use of such motor vehicle registration data for any other purpose is a violation of law in several states. Accordingly, you are urged to limit the use of this listing to the follow-up necessary to complete this campaign.

CUSTOMER NOTIFICATION

Beginning on September 3, 1996 affected customers will be notified of this campaign on their vehicles by lefter from Cadillac Motor Car Division. A copy of the customer letter is included with this bulletin.

In order to ensure full protection under the emission warranty, and the right to participate in future recalls, the customer notification lefter recommends that customers have their vehicles serviced as soon as possible. It also advises that failure to do so could legally be determined to be lack of proper maintenance, and that the vehicle may fail a state or local emission inspection test if the recall work is not completed. Additionally, if the dealer finds that the emission system has been intentionally disabled, the lefter explains that the cost of system restoration, so that it will function as designed, is the responsibility of the customer.

Regardless of whether the owner decides to have an intentionally disabled emission system repaired, the dealer should perform the campaign correction unless it is determined that performing the remedy without repairing the intentionally disabled emission system might create a risk of accident or injury.

COURTESY TRANSPORTATION

The availability of courtesy transportation to customers whose vehicles are involved in this campaign is of the utmost importance in maintaining customer satisfaction. Dealers are to take the steps necessary to ensure that these customers clearly understand that courtesy transportation is available and will be provided upon request at no charge. Dealers should submit such claims in the normal manner and appropriate credit will be issued.

DEALER CAMPAIGN RESPONSIBILITY

All unsold new vehicles in dealers' possession and subject to this campaign mu be held and inspected/repaired per the service procedure of this campaign bulletin before customers take possession of these vehicles.

Dealers are to service all vehicles subject to this campaign at no charge to customers, regardless of mileage, age of vehicle, or ownership, from this time forward.

Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. This could be done by mailing to such customers a copy of the appropriate divisional customer lefter accompanying this bulletin. Campaign follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification lefter.

In summary, whenever a vehicle subject to this campaign enters your vehicle inventory, or is in your dealership for service in the future, please take the steps necessary to be sure the campaign correction has been made before selling or releasing the vehicle.

When a California emissions campaign is completed by a GM dealer, the dealer must provide the vehicle owner a "Proof Of Correction Certificate" which the owner may need to present to the California Department Of Motor Vehicles (DMV) when renewing their vehicle registration. Without this correction certificate, the owner may be unable to renew their vehicle registration.

Additional Certificates can be obtained, at no charge, from VISPAC, Incorporated by calling 1-800-269-5100, Monday through Friday, 8:00 A.M. to 4:30 P.M. Eastern Standard Time. Ask for GM Item Number 1825 when ordering.

Notice: Dealers are to immediately render inoperative each old PCM Mem- Cal/Prom as it is removed from an involved vehicle. Any reuse of an old PCM Mem-Cal/Prom in any vehicle would be regarded by the EPA as tampering under the Clean Air Act that could subject the dealer to penalties of up to $2,500 per violation. See Step 17 of the Service Procedure section of this bulletin.

PARTS INFORMATION

An initial supply of parts required to complete this campaign on 1995 and 1994 model vehicles will be pre-shipped to involved dealers of record. This pre-shipment will occur the week of August 26, 1996. Pre-shipped parts will be charged to dealer's open parts account.

Additional parts required to complete this campaign are to be obtained from General Motors Service Parts Operations (GMSPO). Please refer to your "involved vehicles listing" and check Table 2 of this bulletin for service part information prior to ordering additional parts requirements. Normal orders should be placed on a Daily Replenishment Order (DRO). An emergency part requirement should be ordered on a Customer Special Order (CSO).

Due to the low number of vehicles involved and the limited availability of these parts, dealers should not order the following campaign part numbers for use as shelf stock.

16242428 16242431 16242441 16242443 16242458 16242461 16242463 16242478 16242481 16242483 16242488 16242492 16242688

These campaign part numbers should only be ordered by dealers when an affected vehicle requires repair at their dealership.

SERVICE PROCEDURE

The following service procedure is to be performed on certain 1991-1995 model Cadillac vehicles equipped with the 4.9 liter engine (RPO L26), which can be easily identified by the character "B" in the 8th position of the Vehicle Identification Number.

It is important to note that some 1991 and 1992 model vehicles built before October 24, 1991 may have experienced warranty repairs with a labor operation code of T6527 or J6364 and received the prom being recalled as a service part. VIN breakpoints for 1992 model vehicles are:

247930 for DeVille 604013 for Eldorado 806499 for Seville

Affected 1991 model vehicles and 1992 model vehicles built before these breakpoints should be inspected and repaired if necessary. Dealers mL& confirm vehicle eligibility through the Vehicle Information Service System (VISS) and/or their "involved vehicles listing" prior to performing this inspection. All 1992 model vehicles built after the breakpoints require Mem-Cal replacement using the following procedure.

1. Determine the PROM ID number by using the appropriate procedure which follows. Note that the use of a Tech 1 diagnostic tool for this purpose is specifically NQT- recommended.

* Turn ignition key to the "RUN" position.

* Simultaneously press and hold the "OFF" and "WARMER" buttons on the Electronic Climate Control (ECC) panel until all segments on the ECC and Fuel Data Center (FDC) panel are illuminated. Then release the buttons.

A. All 1991-1993 model C

* Observe the FDC panel. Any Powertrain Control Module (PCM) or Body Control Module (BCM) Diagnostic Trouble Codes which may be present will be displayed on the FDC panel. Codes will be stored in memory as either history or current codes. Any PCM history codes will appear first preceded by ..E. Any PCM current codes will then be displayed preceded by E.E. The same sequence will follow for any BCM codes. BCM codes will follow ..F and F.F readouts for history and current codes respectively. Record all codes on the repair order for use in diagnosing other possible customer service needs.

* After all Trouble Codes have been displayed .7.0 will display.

* When .7.0 appears on the FDC, press the "LO" button on the ECC panel to access PCM data. E.9.0 will display. Press the "LO" button again and P.2.5 will display. The PROM ID number will be displayed as a three digit code following P.2.5. Record PROM ID number on the repair order.

B. All 1991-1993 model E/K (Except 1993 model ETC, STS, Eldorado Sport Coupe) and 1994-1995 model Ksp except those registered in the State of California. Note that DeVille Concours is not included.

* Observe the Driver Information Center (DIC). All history or current Powertrain Control Module (PCM), Instrument Panel Cluster (IPC), Air Conditioning Programmer (ACP), Supplemental Inflatable Restraint (SIR) and Traction Control System (TCS) codes which are present will be displayed in that order followed by PCM?. Record all codes on the repair order for use in diagnosing other possible customer service needs. After PCM? is displayed, press "HI" to access PCM DATA?. Press "HI" again to enter PCM parameters and PD01 will display. Press "LO" and PD99 will display preceded by the 3 or 4 digit PROM ID number. Record PROM ID number on the repair order.

Notice: On 1991 and 1992 model vehicles only, if the PROM ID is the number listed in Table 1 of this bulletin, or a lower number, the Mem-Cal should NOT be replaced. Proceed to Step 19.

2. After determining the PROM ID number of the Mem-Cal which is currently installed in the vehicle, refer to Table 2 of this bulletin. Find the model year, carline and emission system of the vehicle being serviced. Identify the old Prom ID number as recorded on the repair order. Determine the new Prom ID number and Mem-Cal part number to be installed in the PCM as indicated on the right side of the table.

CAUTION:

To prevent internal PCM damage, the ignition must be "off" when disconnecting or reconnecting power to the PCM.

The Mem-Cal and PCM are sensitive to electrostatic discharge. Follow these procedures before handling these components to reduce any possible electrostatic charge build up on the technician's body and inadvertent discharge to the electronic part:

a. Always touch a known good ground before handling these components. This should be repeated while handling the part and more frequently after sliding across a seat, sifting down from a standing position or walking a distance.

b. Avoid touching the electrical terminals of the part unless instructed to do so by a written diagnostic procedure.

c. Do not remove a part from its protective package until it is time to install it.

d. Before removing the part from its package, ground the package to a known good ground on the vehicle.

Mem-Cal/Prom Removal --------------------

Before proceeding to Step 3, determine the AM and FM radio station frequencies which have been pre-set by the customer. Write them on the repair order. The battery electrical disconnect will result in loss of both clock time and all pre-set radio stations. Resetting the clock to the correct time and the radio to the customer's preferred stations before returning the vehicle is a courtesy which will be sincerely appreciated.

3. Turn ignition key to "OFF" position and disconnect the negative battery cable.

4. Remove right hand hush panel.

5. Remove the three (3) electrical connectors to PCM.

6. Remove PCM retaining nut.

7. Pull PCM rearward to disengage the top mounting pins and remove the PCM from the passenger compartment.

8. Remove Mem-Cal access cover from the PCM and remove Mem-Cal. When removing the Mem-Cal use two fingers and push both retaining clips from the Mem-Cal at the same time. Grasp the Mem-Cal at both ends and lift from the Mem-Cal socket.

Mem-Cal Installation

9. Align the notches on the Mem-Cal with the notches in the Mem-Cal socket. Gently press on the ends of the Mem-Cal until it is seated in the socket. Do not press on the middle of the Mem-Cal. Push the clips onto the sides of the Mem-Cal until they snap into place. Listen for the click from each end.

10. Install the Mem-Cal access cover onto the PCM.

11. Place the PCM onto the mounting bracket, slide the PCM forward to engage the top mounting pins and install the PCM retaining nut.

12. Install the three (3) electrical connectors to the PCM.

13. Reconnect negative battery cable.

14. Start the engine. Engine should start and run. Turn engine off.

* Functionally check the PCM/Mem-Cal by turning the ignition to "RUN" and enter diagnostics as described in Step 1. Code E52 and B552 (1991 model E/K and 1991-1993 model C only) or Codes P052 HISTORY and 1052 HISTORY (1 992- 1993 model E/K and 1994-1995 model Ksp only) will appear and must be cleared.

* Clear code E52 by pressing "OFF" and "HI" simultaneously. Press any ECC panel button to exit diagnostics. If diagnostic Code F32 or B334 or 1034 appears on the display, the Mem-Cal is not fully seated or is malfunctioning. If it is necessary to remove and reinstall the Mem-Cal, follow the procedures listed in Steps 3 through 14.

* To clear codes P052 HISTORY and 1052 HISTORY wait until PCM? displays. After PCM? is displayed press "Hi". PCM DATA? should display. If PCM DATA? is not accessible or a NO PCM DATA message is displayed, verify that the PCM contains the correct PROM, that the PCM connectors are correctly installed, and the PCM fuses in the engine compartment fuse block are present and not blown (see page 8A-20-0 in the appropriate Service Information Manual). Press "LO" four times until PCM CLEAR CODES displays. Press "HI" to clear all PCM codes. Press "LO" twice to display IPC?. Press "HI" to display IPC DATA? followed by "LO" three times to display IPC CLEAR CODES?. Press "HI" to clear all IPC codes. Press "DEFOG" to exit diagnostics.

15. Once engine operation is verified, perform the following TPS/Idle Learn Procedure. Note that in order to perform this procedure the outside temperature must be above 10 degrees Celsius (50 degrees Fahrenheit) to enable A/C compressor operation and the engine coolant temperature must be above 80 degrees Celsius (176 degrees Fahrenheit) to insure PCM closed loop operation. Check engine coolant temperature as follows:

A. All 1991-1993 model C

* Enter diagnostics by simultaneously pressing the "OFF" and "WARMER" buttons on the ECC panel. After .7.0 displays on the FDC panel press the "LO" button to display E.9.0. Press "HI" four times to display P.O.4 which will be followed by the coolant temperature displayed in degrees Celsius.

B. All 1994-1995 model Ksp

* Enter diagnostics by simultaneously pressing the "OFF" and "WARMER" buttons on the ECC panel. When PCM? displays on the DIC panel, press "HI" to display PCM DATA?. Press "HI" four more times to display P.O.4 which will be followed by the coolant temperature displayed in degrees Celsius.

C. All 1991-1993 model E/K

* Coolant temperature, in degrees Fahrenheit, may be displayed on the DIC by pressing and releasing the "ENG DATA" (1991 model E/K) or "INFORMATION" (1992-1993 model E/K) button until it appears.

TPS/Idle Learn Procedure -------------------------

a. Starting from the ignition "OFF" position, wait a minimum of 20 seconds then turn the ignition to the "RUN" position (engine not running).

b. Enter diagnostics by simultaneously pressing the "OFF" and "WARMER" buttons on the Electronic Climate Control (ECC) panel.

c. Turn the ignition to the "OFF" position.

d. Wait a minimum of 20 seconds then turn the ignition to the "RUN" position (engine not running).

e. Enter diagnostics by simultaneously pressing the "OFF" and "WARMER" buttons on the ECC panel.

f. Turn the ignition to the "OFF" position.

g. Wait a minimum of 20 seconds then start engine. h. With the engine running, apply brakes and place transaxle in "DRIVE" range. i. Turn the ECC to "OFF" and allow the engine to idle for at least one minute (foot off the accelerator).

j. Turn the ECC to "AUTO" and verify that A/C compressor engagement occurs. Allow engine to idle for at least one minute (foot off the accelerator).

k. Place transaxle in "PARK" range and turn engine off.

16. Install hush panel.

17. Destroy the Mem-Cal removed from the vehicle by crushing it in a vise or press. Wear safety goggles or other protective eyewear when performing this procedure.

18. Reset the clock to the correct time and the AM and FM radio stations to those which were previously set by the customer.

19. Install Campaign Identification Label.

20. California Dealers Only: Provide the customer with a "Vehicle Emission Recall Proof Of Correction" certificate.

CAMPAIGN IDENTIFICATION LABEL

Each vehicle corrected in accordance with the instructions outlined in this Product Campaign Bulletin will require a "Campaign Identification Label". Each label provides a space to include the campaign number and the five (5) digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or a ball point pen.

Each "Campaign Identification Label" is to be located on the radiator core support in an area which will be visible when the vehicle is brought in by the customer for periodic servicing. When installing the Campaign Identification Label, be sure to install the clear protective covering. Additional Campaign Identification Labels can be obtained from VISPAC Incorporated by calling 1-800-269-5100 (Monday-Friday, 8:00 a.m. to 4:30 p.m. EST). Ask for Item Number S-1015 when ordering.

Apply the "Campaign Identification Label" only on a clean, dry surface.

CLAIM INFORMATION

Submit a Product Campaign Claim with the information indicated below:

REPAIR PART FAILED PARTS FAILURE LABOR LABOR PERFORMED COUNT PART ALLOW. CODE OPER. HOURS NO. Inspect Only 96 V9924 0.3* 1991 & 1992 C/E/K Mem-Cal Replacement Not Required

Inspect/Repair 1 ** *** 96 V9925 0.7* 1992 C Mem-Cal Replacement Required Add: 1991 C/E/K 0.1 Add: 1992 E/K 0.1

Repair Only 1 ** *** 96 V9926 0.6* 1995 DeVille Mem-Cal Replacement Required Add: 1992 C 0.1 Add: 1992 E/K 0.2 Add: 1993 C/E/K 0.1 Add: 1994 DeVille 0.1

* This labor time represents the actual time required to perform this correction plus 0. 1 additional hour for Campaign Administrative Allowance.

** Use applicable part number as indicated in Table 2 of this bulletin (see "OLD MEMCAL PART NUMBER" column).

*** The "Parts Allowance" should be the sum total of the current GMSPO Dealer Net price plus 40% for 1994 and 1995 model or 30% for 1991-1993 model of all parts required for the repair.

Refer to the General Motors Claims Processing Manual for additional information about Product Campaign Claim Submission.

September, 1996

Dear Cadillac Customer:

The Administrator of the U. S. Environmental Protection Agency has determined that 1991-1995 model Cadillacs equipped with 4.9 liter engines may require modifications in order to comply with requirements of the Clean Air Act designed to protect the public health and welfare. GM has determined that the modifications required by EPA will help reduce emissions of carbon monoxide and hydrocarbons, which are regulated by EPA under the Clean Air Act. Because GM has achieved this improved emissions performance without compromising driveability, EPA and GM strongly encourage you to bring your car to a dealer to perform the modification.

In October 1991, General Motors implemented a change in its production of 1992 model Cadillacs equipped with 4.9 liter engines that introduced an enrichment calibration to the fueling strategy. This calibration was subsequently included in production of 1993-1995 model Cadillacs equipped with 4.9 liter engines and in service parts received by certain 1991-1992 model Cadillacs equipped with 4.9 liter engines. The United States alleges that this calibration has a detrimental effect on a vehicle's emission control system and that this calibration was not adequately reported to the EPA.

General Motors has agreed to modify the fueling calibration for these vehicles in a way that reduces the emission of air pollutants from the vehicles without compromising driveability. All vehicles that were built with the fueling calibration in question or which subsequently received the calibration through a vehicle service repair are being recalled to have the fueling calibration revised.

To correct this condition, your Cadillac dealer will inspect and, if necessary, replace the calibration chip in the Powertrain Control Module on your vehicle. Of course, this service will be performed at no cost to you.

The mailing of this lefter has been coordinated to ensure that instructions for making this repair have been received by your dealer and that needed parts are available for your car. Please contact your Cadillac dealer as soon as possible to arrange a service appointment and courtesy transportation, if required. Please ask your dealer if you wish to know how much time is needed to process your vehicle. Included in this time would be about forty-five (45) minutes for a technician to perform this repair.

The enclosed Campaign Owner Identification Card identifies your vehicle. Presentation of this card to your dealer will assist in making the necessary corrections in the shortest possible time. If you no longer own this vehicle, please let us know by completing this postage-paid reply card and returning it to us.

To ensure your full protection under the emission warranty applicable to your vehicle by Federal law, and your right to participate in future emission recalls, it is recommended that you have your vehicle serviced as soon as possible. Failure to do so could legally be determined to be lack of proper maintenance of your vehicle. Also, your vehicle may fail a state or local emission inspection test if the recall work is not accomplished.

IMPORTANT MESSAGE TO CALIFORNIA RESIDENTS

The California Air Resources Board (CARB) requires that vehicle emission recall campaigns be completed prior to California registration renewal. Uncorrected emission recall campaigns will result in the inability to renew your California vehicle registration.

At the time of emission campaign completion, your California dealer will issue a "Proof of Correction Certificate". Keep this certificate and, if required, present it to the Department of Motor Vehicles when renewing your California registration as proof of campaign completion.

Should your dealer find that your emission system has been intentionally disabled, you will be asked if you wish the system to be restored so that it will function as designed. The cost of such restoration will be your responsibility.

We are sorry to cause you any inconvenience; however, we have taken this action in the interest of maintaining emissions from your vehicle at a level that meets the requirements of the Clean Air Act. If you have any questions, please contact your Cadillac dealer or call our Customer Assistance Center at 1-800-458-8006.

Cadillac Motor Car Division General Motors Corporation

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.