Pin Function Wire Color Application Notes Description
AA2
Main power relay (MPR)
control
Yellow/purple –
The PCM grounds this pin to activate the MPR. The
output from the MPR goes to several circuits, each
protected with a fuse.
AB2 Not used – – –
AC2 Not used – – –
AD2 Not used – – –
AE2 Start relay control Black/blue –
The PCM grounds this pin to activate the start relay,
which turns on the starter motor. If no RPM is
detected, the PCM will quickly turn the starter off.
AF2
Fuel injector driver—cylinder
number 6
Pink/purple –
The PCM grounds this pin to turn on the injector and
spray fuel into the intake of cylinder number 6.
AG2 Alternator Orange – –
AH2 Ignition coil driver—number 3 Green/purple
Fires cylinders 4
and 7 on V8. Fires
cylinders 2 and 5 on
V6.
Directly drives the ignition coil by grounding the circuit
internally.
AA3 Trim up relay control
Light blue/
white
The PCM grounds this pin to activate the trim up
relay. The DTS command module sends an electronic
trim up command to the PCM on CAN X.
AB3 Not used – – –
AC3 Not used – – –
AD3
Safety lanyard circuit
(ESTOP)
Black/yellow –
The ESTOP switch is normally open. When activated,
it closes to ground. Activating the lanyard switch
disables the ignition coil drivers and the fuel pump.
AE3 Serial communications + Blue/white – Communication circuit—SmartCraft depth finder.
AF3
Fuel injector driver—cylinder
number 1
Pink/brown –
The PCM grounds this pin to turn on the injector and
spray fuel into the intake of cylinder number 1.
AG3 PCM ground 3 Black/white –
One of three (AG3, CG1, CG2) PCM ground pins.
These circuits end at the battery negative terminal.
AH3 Ignition coil driver—number 2 Green/red
Fires cylinders 5
and 8 on V8. Fires
cylinders 3 and 6 on
V6.
Directly drives the ignition coil by grounding the circuit
internally.
AA4 Warning horn driver Tan/light blue
Not used on DTS
engines.
The PCM grounds this pin to sound the warning horn.
AB4 Fuel pump relay (FPR) control Yellow/black –
The PCM grounds this pin to activate the fuel pump
relay.
AC4 Crankshaft position sensor + Red – –
AD4 Crankshaft position sensor – White – –
AE4 Serial communications – White/blue – Communication circuit—SmartCraft depth finder.
AF4
Fuel injector driver—cylinder
number 3
Pink/orange –
The PCM grounds this pin to turn on the injector and
spray fuel into the intake of cylinder number 3.
AG4 Power steering White/blue – –
AH4 Ignition coil driver—number 1 Green/brown
Fires cylinders 1
and 6 on V8. Fires
cylinders 1 and 4 on
V6.
Directly drives the ignition coil by grounding the circuit
internally.
PCM 112 Important Information and Pinouts
Page 2A-6 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018
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