Mercury V6 175 Diagnostic Manual page 34

PCM 112 Important Information and Pinouts
Pin Function
Main power relay (MPR)
AA2
control
AB2 Not used
AC2 Not used
AD2 Not used
AE2 Start relay control
Fuel injector driver—cylinder
AF2
number 6
AG2 Alternator
AH2 Ignition coil driver—number 3
AA3 Trim up relay control
AB3 Not used
AC3 Not used
Safety lanyard circuit
AD3
(ESTOP)
AE3 Serial communications +
Fuel injector driver—cylinder
AF3
number 1
AG3 PCM ground 3
AH3 Ignition coil driver—number 2
AA4 Warning horn driver
AB4 Fuel pump relay (FPR) control
AC4 Crankshaft position sensor +
AD4 Crankshaft position sensor –
AE4 Serial communications –
Fuel injector driver—cylinder
AF4
number 3
AG4 Power steering
AH4 Ignition coil driver—number 1
Page 2A-6
Wire Color Application Notes
Yellow/purple –
– –
– –
– –
Black/blue –
Pink/purple –
Orange –
Fires cylinders 4
and 7 on V8. Fires
Green/purple
cylinders 2 and 5 on
V6.
Light blue/
white
– –
– –
Black/yellow –
Blue/white –
Pink/brown –
Black/white –
Fires cylinders 5
and 8 on V8. Fires
Green/red
cylinders 3 and 6 on
V6.
Not used on DTS
Tan/light blue
engines.
Yellow/black –
Red –
White –
White/blue –
Pink/orange –
White/blue –
Fires cylinders 1
and 6 on V8. Fires
Green/brown
cylinders 1 and 4 on
V6.
© 2018 Mercury Marine
Description
The PCM grounds this pin to activate the MPR. The
output from the MPR goes to several circuits, each
protected with a fuse.
–
–
–
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.
The PCM grounds this pin to turn on the injector and
spray fuel into the intake of cylinder number 6.
–
Directly drives the ignition coil by grounding the circuit
internally.
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.
–
–
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.
Communication circuit—SmartCraft depth finder.
The PCM grounds this pin to turn on the injector and
spray fuel into the intake of cylinder number 1.
One of three (AG3, CG1, CG2) PCM ground pins.
These circuits end at the battery negative terminal.
Directly drives the ignition coil by grounding the circuit
internally.
The PCM grounds this pin to sound the warning horn.
The PCM grounds this pin to activate the fuel pump
relay.
–
–
Communication circuit—SmartCraft depth finder.
The PCM grounds this pin to turn on the injector and
spray fuel into the intake of cylinder number 3.
–
Directly drives the ignition coil by grounding the circuit
internally.
90-8M0146617 eng JULY 2018