Mercury V8 300 User Manual

Terminal Test Probe Kit Bosch P/N MM‑ 46523
a - O2 sensor connector
b - Main power relay (MPR)
c - Hot stud (battery +)
d - Fuses: 10‑amp fuse
e - PCM connector B
f - PCM connector A
Connector Pin Wire Color Function PCM
65670
3
1
5
2
6
4
1 White/gray UEGO (1) ‑ port BB1
2 White/purple UEGO (2) ‑ port BB3
3 Orange/white UEGO port heat BL1
4 Orange/white Fused (10 A) 12 V power (+) –
5 Tan/green UEGO (5) ‑ port BB2
6 Light green/orange UEGO (6) ‑ port BC3
Hot stud ring terminal – Red 12 V battery power (+) –
MPR 86 Yellow/purple MPR control signal AA2
MPR 87 Red/white Switched 12 V power (+) –
O2 Sensor Removal
1. Cut the cable tie that secures the O2 sensor harness to the harness connector.
2. Cut the cable tie that secures the O2 sensor harness to the crankshaft position sensor (CPS) leg of the engine harness.
3. Disconnect the O2 sensor harness from the engine harness.
4. Use an appropriate oxygen sensor socket to remove the O2 sensor from the exhaust manifold.
105C
105B
109B
LT GRN/ORN
ORN/WHT
ORN/WHT
TAN/GRN
RED/WHT
WHT/GRA
WHT/PPL
RED/WHT
RED RED
LT GRN/ORN
ORN/WHT
TAN/GRN
ORN/WHT
RED
YEL/PPL
WHT/GRA
WHT/PPL
YEL/PPL
10A
A1
A2
A3
A4
A5
A6
B1
B2
B3
B4
B5
B6
C1
C2
C3
C4
C5
C6
1 2
3
4
5
6
30
8586 87
B1
B2
B3
M4
A1
C3
L1
A1
A2
H4
2
4
6
5
3
1
A
B
C
D
E
F
G
H
1
2
3
4
A
B
C
D
E
F
G
H
A B
C
D E F G H
J
K
AB
C
DEFGH
J
K
1
3
2
4
L
M
L
M
M
A
4
1
H
A
4
1
87
30
8685
B6 B5 B4 B3
B2
B1
C6
C5
C4
C3 C2
A6 A5 A4 A3 A2 A1
C1
65456
a
b
c
d
e
f
Sensors
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 5A-35

Mercury V8 300 Specifications

General

Brand	Mercury
Model	V8 300
Category	Outboard Motor
Language	English