Direct Injector Leak Test - Mercury Optimax 250 Manual

DIRECT FUEL INJECTION
6. An ohm test of the direct injector may be made by connecting test leads to injector
terminals. Ohm reading should be 1.3
7. An ohm test to determine if direct injector windings are shorted to ground can be made
by connecting one ohm lead to either injector pin while touching the other ohm lead
to the injector metal case. There should be no continuity. If there is continuity, the inter-
nal windings are shorted and the injector must be replaced.
a -
b -

Direct Injector Leak Test

1. Attach Gearcase Leakage Tool (FT-8950) to discharge side of injector.
a -
b -
2. Pump up leakage tool to indicate 25 - 30 psi (172.4 - 206.8 kPa).
3. Direct injector should not leak down more than 1/2 psi (3.5 kPa) in 1 minute.
4. If injector does not meet the above specifications, replace injector.
Page 3B-50
30 20
40
OHMS 15
60
10
100
5
200
0
20
30
10
10
5 15
40
0
20
VOLTS 4 6
0
8
2
10
0
DC AMPS
DCV ACV
X1
DVA
a
56003
Direct Injector Ohm Test (1.3
Direct Injector Short to Ground Ohm Test (no continuity)
a
Gearcase Leakage Tool (FT-8950)
Direct Injector
0.3 ohm.
30
40 20
15
OHMS
60
10
100
5
200
20
30
10
10
5 15
40
0
20
4 6
VOLTS 0
8
2
10
0
DC AMPS
DCV ACV
X1
DVA
0.3 ohm)
b
0
b
58456
57714
90-888438 JUNE 2002