Sensors, Actuators, Relays, and Accessories
Section 5A - Sensors
Table of Contents
Sensor Tests......................................................................5A-2
Swapping Sensors......................................................5A-2
General Sensor Troubleshooting................................5A-2
Three‑Wire Sensor Power Supply and Ground Circuit
Test......................................................................... 5A-3
Sensor Signal Circuit Test.......................................... 5A-3
Sensor Opens and Shorts..................................................5A-3
Two‑Wire Sensor Opens and Shorts.......................... 5A-3
Three‑Wire Sensor Opens and Shorts....................... 5A-3
Wire Color Code Abbreviations..........................................5A-4
Sensor Power A ‑ DTS.......................................................5A-6
Circuit Description.......................................................5A-7
Sensor Power A ‑ Mechanical............................................5A-8
Circuit Description.......................................................5A-9
Sensor Power B................................................................. 5A-9
Circuit Description.......................................................5A-9
Sensor Power C...............................................................5A-10
Circuit Description.....................................................5A-10
Block Water Pressure Sensor..........................................5A-10
Block Water Pressure Sensor Tests.........................5A-11
Block Water Pressure Sensor Removal................... 5A-12
Block Water Pressure Sensor Installation................ 5A-12
Camshaft Position Sensor............................................... 5A-12
Camshaft Position Sensor Tests.............................. 5A-13
Camshaft Position Sensor Removal......................... 5A-14
Camshaft Position Sensor Installation...................... 5A-14
Crankshaft Position Sensor (CPS)...................................5A-15
CPS Test.................................................................. 5A-15
Crankshaft Position Sensor Removal....................... 5A-16
Crankshaft Position Sensor Installation.................... 5A-16
Engine Coolant Temperature (ECT) Sensor....................5A-17
ECT Sensor Test...................................................... 5A-17
ECT Sensor Removal............................................... 5A-18
ECT Sensor Installation............................................ 5A-19
Exhaust Gas Temperature (EGT) Sensor........................5A-19
EGT Sensor Test...................................................... 5A-19
EGT Sensor Removal...............................................5A-21
EGT Sensor Installation............................................5A-22
Intake Air Temperature (IAT) Sensor...............................5A-22
IAT Sensor Test........................................................5A-23
IAT Sensor Removal.................................................5A-24
IAT Sensor Installation..............................................5A-25
Manifold Absolute Pressure (MAP) Sensor..................... 5A-26
MAP Sensor Test......................................................5A-26
MAP Sensor Removal.............................................. 5A-27
MAP Sensor Installation........................................... 5A-27
Oil Level Sensor...............................................................5A-27
Oil Level Sensor Test............................................... 5A-28
Oil Level Sensor Removal........................................ 5A-29
Oil Level Sensor Installation..................................... 5A-29
Oil Pressure Sensor.........................................................5A-30
Oil Pressure Sensor Test..........................................5A-30
Oil Pressure Sensor Removal.................................. 5A-31
Oil Pressure Sensor Installation............................... 5A-32
Oil Temperature Sensor...................................................5A-32
Oil Temperature Sensor Test................................... 5A-32
Oil Temperature Sensor Removal............................ 5A-33
Oil Temperature Sensor Installation......................... 5A-33
Oxygen (O2) Sensor........................................................ 5A-34
O2 Sensor Test.........................................................5A-34
O2 Sensor Removal................................................. 5A-35
O2 Sensor Installation.............................................. 5A-36
Pitot Pressure Sensor...................................................... 5A-36
Pitot Pressure Sensor Test.......................................5A-36
Pitot Pressure Sensor Removal................................5A-37
Pitot Pressure Sensor Installation.............................5A-38
Shift Demand Sensor.......................................................5A-38
Shift Demand Sensor Testing...................................5A-38
Shift Demand Sensor Removal................................ 5A-39
Shift Demand Sensor Installation............................. 5A-40
Throttle Demand Sensor..................................................5A-40
Throttle Demand Sensor Testing..............................5A-41
Throttle Demand Sensor Removal........................... 5A-42
Throttle Demand Sensor Installation........................ 5A-43
Trim Position Sensor........................................................5A-43
Water‑in‑Fuel (WIF) Sensor.............................................5A-43
WIF Sensor Test.......................................................5A-44
WIF Sensor Removal and Installation...................... 5A-45
Sensors
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 5A-1
5
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