S15/T15 Sonoma P/U 2WD L4-2.2L VIN 4 (1995)
1. Turn ignition ON.
2. Enter diagnostics.
A. Diagnostic Trouble Code (DTC) 12 should flash four times (if no other DTC[s] are present). This indicates the PROM (MEM-CAL) is
installed properly, and the PCM is functioning.
B. If DTC 51 occurs, or if the MIL is "ON" constantly with no DTC(s), the PROM (MEM-CAL) is not fully seated or is defective.
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If not fully seated, press firmly on the ends of the PROM (MEM-CAL).
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If it is necessary to remove the PROM (MEM-CAL), follow the previous removal instructions.
NOTE: To prevent possible Electrostatic Discharge damage to the PROM (MEM-CAL), Do Not touch the component leads, and Do Not remove
integrated circuit from carrier.
