Terminal Test Probe Kit Bosch P/N MM‑ 46523
a - Oil level sensor connector
b - PCM connector B
c - PCM connector C
Connector Pin Wire Color Function PCM
A Purple/black Sensor power C (+) CE4
B Tan/black Oil level signal BD1
C Black/green Sensor ground C (–) CE3
D N/A Not used –
E N/A Not used –
5. If no faults are found in the wiring and connections, replace the oil level sensor and retest.
Oil Level Sensor Removal
1. Remove the starboard air intake runner. Refer to the appropriate service manual.
2. Cut the cable tie that secures the oil level sensor module to the relay bracket.
3. Remove two screws and remove the relay bracket from the engine.
4. Disconnect the oil level sensor harness from the engine harness.
5. Remove the oil level sensor from the engine.
a - Oil level sensor harness connection to engine harness
b - Screws (2)
c - Oil level sensor
d - Cable tie around the oil level sensor module
Oil Level Sensor Installation
1. Insert the oil level sensor into the engine, and tighten it to the specified torque.
Description
Nm lb‑in. lb‑ft
Oil level sensor 20 177 –
2. Use two screws to attach the relay bracket to the engine. Tighten the screws to the specified torque.
125A
124A
124B
PPL/BLK
BLK/GRN
TAN/BLK
TAN/BLK
BLK/GRN
PPL/BLK
A
B
C
D
E
H4
E3
E4
A1
D1
M4
A1
A
B
D
E
C
A B
C
D E F G H
J
K
AB
C
DEFGH
J
K
1
3
2
4
L
M
L
M
Sensors
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 5A-29
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