Test TC-30A - Pcm Failure EEPROM Write Denied (DTC 63)

WARNING: This page is about a different car, the 1995 Jeep Wrangler, 1995 Jeep Grand Cherokee, and 1995 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Perform TEST TC-1A before proceeding with this test. For connector terminal identification, see CONNECTOR IDENTIFICATION at beginning of article. For wiring diagrams, see WIRING DIAGRAMS at the end of this article. Perform TEST VER-2A after each repair.

When scan tool displays WRITE REFUSED, PCM was busy. Using scan tool, perform SRI memory test. Retest SRI memory 2 more times if necessary. If scan tool displays WRITE REFUSED, replace PCM. If scan tool does not display WRITE REFUSED, vehicle is functioning properly. Test is complete.