a - Shift actuator harness (8M0150597)
b - Engine harness
c - Shift actuator and wiring
d - Shift position sensor 2
e - Sensor power A
f - H‑bridge (+)
g - Shift position sensor 1
h - H‑bridge (–)
i - Sensor power ground
j - Test light
1. Insert the Y‑harness between the shift actuator and the engine harness.
Shift Actuator Harness 8M0150597
2. Connect a test light across the red/purple and black wires of the Y‑harness. Also connect a DMT 2004 digital multimeter
black lead to the black wire and red lead to the red/purple wire.
Test Light Obtain locally
DMT 2004 Digital Multimeter 91‑892647A01
3. Perform the indicated actions and use the test light to interpret the PCM shift actuator driver output.
NOTE: The engine will not shift into forward gear unless it is running.
Action
Expected Test Light Pattern Measured voltage
Neutral No light 0
Neutral to forward Light on for one second Positive (+)
Forward to neutral Light on for one second Negative (–)
Neutral to reverse Light on for one second Negative (–)
Reverse to neutral Light on for one second Positive (+)
Engine power up No light 0
4. If the light functions as expected, the PCM H‑bridge and actuation wires are operating correctly. Replace the shift actuator
after confirming that the gearcase is mechanically sound.
Shift Position Sensor Circuit Test
The Y‑harness may be used to break out the shift position sensor circuits for testing purposes. Connect a DMT 2004 digital
multimeter black lead to the sensor ground wire (black/orange) and the red meter lead to the wire as indicated in the table
below.
NOTE: The engine will not shift into forward gear unless it is running.
DMT 2004 Digital Multimeter
91‑892647A01
Shift Position Sensor Voltages
Shift Actuator Position
Red Meter Lead Location
Sensor power A (purple/yellow) Sensor 1 (green) Sensor 2 (pink)
Neutral 5.0 V 2.271–2.686 V 2.314–2.729 V
Forward 5.0 V 3.662–4.712 V 0.288–1.338 V
Reverse 5.0 V 0.293–1.343 V 3.657–4.707 V
If the 5.0 volt reference voltage is present at sensor power A, but either position sensor feedback voltage is outside of the range
for the specified shift position, replace the shift actuator. The shift position sensors are not individually serviceable components.
Actuators and Relays
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 5B-11
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