1999 "EE" Evinrude 70HP 4-Stroke Service Manual, P/N 787023, Page 94Get this manual
lAC Valve Resistance Test]Disconnect lAC valve connectorAttach an ohmmeter to the redblack and black lAC lead terminals If resistance is not as specified, replace valve lAC Resistance 68 (200 C) 4.87.2
MAP Sensor
The Manifold Absolute Pressure sensor can fail two waysIt can have an electrical problem, or it can suffer vacuum lossThe following tests will confirm which has occurredCode 34 (MAP 1)No electrical signal
Monitor MAP values using OMC Diagnostic Software while varying throttle setting with engine in gearMAP values should change YESSystem appears to be working properlyConfirm MAP sensor operation by performing the Voltage Output Change testNOCheck for wiring problemsLook for disconnected or damaged wiresterminals at sensor connector and at ECU connector D1, D2, and D7Repair or replace wiring as necessary