connector terminal "A" and ground. If SERVICE ENGINE SOON light does

not flash when ECM end of terminal "B" wire is jumpered to ground,

check PROM/MEM-CAL for proper installation. If installed correctly,

replace ECM, using original PROM/MEM-CAL. Repeat diagnostic circuit

check. If Code 12 still does not flash, replace PROM/MEM-CAL. Replace

PROM/MEM-CAL only after replacing ECM, as PROM/MEM-CAL is not likely

to be at fault.

SUMMARY

If no faults were found while performing BASIC DIAGNOSTIC

PROCEDURES, no trouble codes (or only intermittent ones) were found

while performing DIAGNOSTIC CIRCUIT CHECK and driveability problems

exist, proceed to H - TESTS W/O CODES article in this section for

diagnosis by symptom (i.e., ROUGH IDLE, NO-START, etc.) or

intermittent diagnostic procedures.

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