Temperature And Manifold Absolute Pressure (Tmap) Sensor - Mercury 15 EFI FourStroke Service Manual

Ignition
2. Using a controllable air pressure source, apply air pressure to the oil pressure switch. Check for continuity specifications.
Meter Test Leads
Red
Switch terminal
Installation
1. Apply Loctite® 567 PST Pipe Sealant to the threads of the oil pressure switch.
Tube Ref No.
Loctite® 567 PST Pipe
9
Sealant
2. Thread the oil pressure switch into the cylinder block. Tighten the oil pressure switch to the specified torque.
3. Use a screw to attach the ring terminal connector (brown/white wire) from the engine harness to the oil pressure switch.
Tighten the screw to the specified torque.
Description
Oil pressure switch
Screw securing ring terminal to oil pressure switch
4. Coat the electrical connection with dielectric grease to prevent corrosion.
Tube Ref No.
Dielectric Grease
6
5. Slide the rubber boot over the switch.
6. Install the port side driveshaft housing cover (refer to Section 5A ‑ Driveshaft Housing Covers). Tighten the screws to
the specified torque.
Description
Driveshaft housing cover screws

Temperature and Manifold Absolute Pressure (TMAP) Sensor

The manifold absolute pressure (MAP) sensor is a pressure transducer that measures the changes in intake manifold pressure
caused by engine load and speed in order to calculate fuel and spark timing requirements.
Manifold absolute pressure is the opposite of manifold vacuum. That is, MAP is low when vacuum is high (such as closed
throttle), and MAP is high when vacuum is low (such as at wide‑open throttle).
The manifold air temperature (MAT) sensor measures the charge air temperature. This information is then conducted to the
ECM for processing.
Page 2A-10
Meter Scale
Black
Resistance
Switch body
Description
Description
© 2018 Mercury Marine
3119
Applied pressure
24.5 kPa (3.55 psi) or higher
Auto
0 kPa (0 psi)
Where Used
Threads of the oil pressure switch
Where Used
Oil pressure switch electrical connection
62990
Reading
Continuity
Nm lb‑in.
8.0 70.8
1.5 13.3
92-823506 1
Nm lb‑in.
6.0 53.1
90-8M0125265 eng NOVEMBER 2017
Open
Part No.
92-809822
lb‑ft
–
–
Part No.
lb‑ft
–