Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 31Get this manual
TESTING IGNITION COMPONENTS ELECTRONIC CONTROL UNIT
ENGINE TEMPERATURE SENSOR
Insert digital or analog ohmmeter test leads into both TAN sensor leadsWith engine at temperature (P or CO indi) catedohm readings should be as indicated 10BLOCK TEMPERATURE1510 -5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 RESISTANCE(OHMS) 7465 5636
Normally, if timing advances and retards with corresponding changes in throttlemost likely the ECU is functioning correctlyIn order to determine if all aspects althe ECU are functioning correctly, CAPACITOR DISCHARGE MODULE (COM) must be attached to the ECURefer to page 2A-6 for OVA test of the trigger circuit of the ECU STATOR
5 14 23 32 41 50 59 68 77 86 95 104 11 122 131 140 149 158 167 176 185 194 203 212 22 230 239 248 257