Mercury OptiMax 250 Manual

DIRECT FUEL INJECTION
Page 3B-50
90-888438 JUNE 2002
6. An ohm test of the direct injector may be made by connecting test leads to injector
terminals. Ohm reading should be 1.3 ± 0.3 ohm.
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.
VOLTS
DC AMPS
OHMS
0
2
46
8
10
DCV ACV
DVA
0
0
5
10
20
10
30
15
40
20
0
5
10
15
20
30
40
60
100
200
X1
56003
a
VOLTS
DC AMPS
OHMS
0
2
46
8
10
DCV ACV
DVA
0
0
5
10
20
10
30
15
40
20
0
5
10
15
20
30
40
60
100
200
X1
58456
b
a-Direct Injector Ohm Test (1.3 ± 0.3 ohm)
b-Direct Injector Short to Ground Ohm Test (no continuity)
Direct Injector Leak Test
1. Attach Gearcase Leakage Tool (FT-8950) to discharge side of injector.
57714
a
b
a-Gearcase Leakage Tool (FT-8950)
b-Direct Injector
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.

Mercury OptiMax 250 Specifications

General

Engine Type	V6
Horsepower	250 hp
Gear Ratio	1.75:1
Starting System	Electric Start
Alternator	60 Amp
Shaft Length	20", 25"