1998 Johnson Evinrude "EC" 90, 115 SPL Service Manual, P/N 520209, Page 121Get this manual
10 DR4077
STEPSENSOR COIL TEST
Ground Test
1Disconnect 5-pin Amphenol connector between the timer base and power pack
2Set peak-reading voltmeter to "POS" and "5", "SEN" and "5" on Stevens CD-77 meter3Alternately, connect voltmeter between each timer base terminal and clean engine groundCrank engine and observe meter at each connection Any reading indicates sensor coils or leads are grounded Locate and repair ground, or replace timer base4If no reading is indicated in Step 3, go to Output TestOutput Test
1Set peak-reading voltmeter to "POS" and "5", "SEN" and "5" on Stevens CD-77 meter