Suzuki DF 90 Service Manual page 88

3-40 ENGINE CONTROL SYSTEM
FUEL INJECTOR OPERATING SIGNAL
1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21
(White connector)
09930-89950 : 44-pin test cord
Peak voltmeter Stevens CD-77
Tester range : NEG50
1. Connect test cord between ECM and wire harness as shown
in figure, then turn ignition switch ON.
2. Connect tester probe - (Black) to starter motor magnetic
switch "B" terminal (connected to battery positive + termi-
nal) as shown in figure.
3. Connect tester probe + (Red) to each terminal.
Injector Terminal
No.1 40
39
No.2
38
No.3
22
No.4
4. Crank engine and measure voltage.
Fuel injector operating signal : 6 – 10 V
23 24 25 26 27 28 29 30 31 32 33 34 35
22 22 22 36 37 38 38 39 40 39 40 41 42 43 44
(Black connector)
Wire harness
(Voltage)
12V
Starter motor magnetic
switch "B" terminal
B
A
A Peak voltage reading (NEG)
B 0V level for peak voltmeter
(Time)