DTC 55

CODE 55 - ECM ERROR

CHECK ALL ECM GROUNDS. IF GROUND CIRCUITS ARE SATISFACTORY CLEAR CODES AND CONFIRM CLOSED LOOP OPERATION. IF CODE 55 REAPPEARS, CHECK ECM TERMINAL VOLTAGES (IN ECM TERMINAL ID AND VOLTAGE SPECIFICATIONS). IF CODE 55 STILL REAPPEARS REPLACE ECM, AND BEFORE CONNECTING BATTERY, TEST ALL SOLENOIDS AND RELAYS. THEY SHOULD HAVE RESISTANCE READINGS OVER 20 OHMS.

CLEAR ALL CODES AND CONFIRM "CLOSED LOOP" OPERATION AND NO "SERVICE ENGINE SOON" LIGHT