Pin Function Wire Color Application Notes Description
BD4 Water‑in‑fuel sensor Tan/purple – –
BE4 Paddle wheel sensor signal Gray/blue –
Paddle wheel provides boat speed data to
SmartCraft gauges. If a pitot sensor is also installed,
the paddle provides slow speed data, while the pitot
provides high speed data.
BF4 Not used – – –
BG4 Not used – – –
BH4
Throttle demand sensor
position 2
Gray/white
Not used on DTS
engines
–
BJ4
Throttle position sensor 2 (TPS
2) signal
White/yellow –
3‑wire position sensor. Measured circuit voltage is
opposite of TPS 1. Voltage is high when throttle is
closed and low when throttle is open. The service
tool indicates voltage changes in the same direction
as TPS 1. This is not accurate when physically
measuring signals with multimeter.
BK4 Camshaft position sensor Red/white – Hall effect sensor
BL4 Not used – – –
BM4 Trim down relay control Green/white –
The PCM grounds this pin to activate the trim down
relay.
Connector C
A1A A1B
A1C A1D A1E A1F
A1G
A1H
A2A A2B
A2C A2D A2E A2F A2G
A2H
A3A A3B
A3C A3D A3E A3F A3G
A3H
A4A
A4B
A4C A4D A4E A4F
A4G
A4H
CA1
CB1
CC1
CD1
CE1
CF1
CG1
CH1
CA2
CB2
CC2
CD2
CE2
CF2
CG2
CH2
CA3
CB3
CC3
CD3
CE3
CF3
CG3
CH3
CA4
CB4
CC4
CD4
CE4
CF4
CG4
CH4
B1A B1B
B1C B1D B1E B1F B1G B1H B1J B1K
B1L
B1M
B2A
B2B
B2C
B2D B2E B2F B2G B2H B2J B2K
B2L
B2M
B3A B3B
B3C B3D B3E B3F B3G B3H B3J
B3K
B3L
B3M
B4A B4B
B4C
B4D
B4E
B4F B4G B4H B4J
B4L
B4M
B4K
57211
C
B A
PCM 112 Important Information and Pinouts
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 2A-9
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