Memory-Calibration Unit (Mem-Cal)(2.5L): Installation

Check that new MEM-CAL has same service number as the one being replaced. Place new MEM-CAL in ECM. Press on ends of MEM-CAL until retaining clips snap into ends of MEM-CAL unit. DO NOT press on middle of MEM-CAL unit, only the ends. Make sure that small notches in MEM-CAL socket and MEM-CAL are properly aligned. See Figure .
Install access cover on ECM and install ECM in vehicle. Start engine and ground diagnostic test lead. Code 12 should flash at least 4 times, with no other codes stored. This confirms proper MEM-CAL installation.
If Code 51 is stored, or if "SERVICE ENGINE SOON" light stays on constantly with no codes, MEM-CAL is not fully seated in ECM, is installed backward, has bent pins or is defective. If pins are bent and crack when straightened, MEM-CAL must be replaced. If MEM-CAL is installed backward or is defective, it must be replaced.