PROM Exchange Instructions and Work Procedure

VINS: ...LA391190 - ...LA4268O7

Tools Required:

Quantity Description

1 Posidriv screwdriver
1 Slip-joint pliers
1 TX20 torx screwdriver
*1 PROM removal tool
*1 Anti-static mat with grounding lead
*1 Ground cuff with lead

* Included with PROM Exchange kit - RTC7680 - previously supplied to all Dealers at no charge for A/C Fix Program.

Before removing the ECU, do the following to check for normal operation of the ECU and related systems:

1. Switch on ignition and listen for the one (1) second fuel pump run.

2. Listen for ABS pump operation.

3. Switch off ignition.

WORK PROCEDURE

1. Remove the ECU from under the right front seat and disconnect multiple connector.

2. Place ECU on grounded anti-static mat, slip on anti-static wrist cuff and connect spiral jumper lead to mat. (Use longer jumper wire to ground mat to an electrical conduit or a cold water pipe).

3. Remove 4 TX20 torx screws from ECU and remove bottom half of cover.

4. Remove the printed circuit board from the case and place on anti-static mat.

5. Locate black PROM cover and remove by grasping with pliers across its width at one end or the other (avoid the center). A rocking motion aids removal. Set cover aside for later use.

6. Using the PROM removal tool, carefully lift the PROM from its socket. USE CARE NOT TO DAMAGE THE PRINTED CIRCUIT BOARD OR OTHER COMPONENTS. Store PROM in parts retention area with a completed Warranty Parts Tag.





7. Remove the new PROM (PRM2419) from its package and insert into the socket. NOTE: The half moon cut-out on the PROM faces away from the multiple connector and should align with a similar cut~ut on the socket. Make sure all pins are engaged before pressing PROM fully in socket. (See illustration).

8. Snap PROM cover in place. If it doesn't fit, re-check PROM for correct installation.

9. Place Printed Circuit Board in case and reassemble cover. Make sure gasket is in place.

10. Attach the multiple connector to the ECU and perform the following initial checks:

A. Switch on ignition - the fuel pump should run for one (1) second. Listen for any unusual noises such as injectors operating or relays clicking which would indicate a problem.

B. Observe that the check engine light comes on and then extinguishes during the bulb check. If not, re-check the multiple connection and, if necessary, replace the ECU.

C. If the vehicle fails "A" or "B", recheck the multiple connector pins and socket. If this does not solve the problem call the Technical Hotline at 1-800-562-5824.