Sym JOYMAX 250 - Page 233

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Liquid-level gauge working Voltage confirmation
a). We can measure the voltage whether the coupler is connected or not. If connected,
use the detection pin to penetrate the wire. The pin assign is like the Figure 16.
b). Key-On, but don’t start the engine.
c). Use the electric meter DCV function to check the working voltage of fuel pump.
d). Check the working voltage: (Shows in Figure 16)
Electric meter negative pole ─ connect the second pin of coupler (Green)
Electric meter positive pole ─ connect the first pin of coupler (Yellow)
If we don’t start the engine after Key–on for 3 seconds duration, ECU will cut off the working
voltage of fuel pump.
Liquid level
guage (+)
(Yellow/White)
Fuel Pump (+)
(Purple)
Figure 15b The coupler pin assign view
Figure 16 Fuel pump working voltage measurement and coupler pin assign
Liquid-level
gauge (+)
(Yellow/White)
Liquid-level gauge (-)
(Green)
Fuel Pump(-)
(Green)
Fuel Pump (+)
(Purple)
The pin assign of Coupler
Working Voltage measurement