Mercury 15 EFI FourStroke, Service Manual

Page: 81 / 406

2. Using a controllable air pressure source, apply air pressure to the oil pressure switch. Check for continuity specifications.
3119
Meter Test Leads
Meter Scale Applied pressure Reading
Red Black
Switch terminal Switch body
Resistance
Auto
24.5 kPa (3.55 psi) or higher Open
0 kPa (0 psi) Continuity
Installation
1. Apply Loctite® 567 PST Pipe Sealant to the threads of the oil pressure switch.
Tube Ref No. Description Where Used Part No.
9
Loctite® 567 PST Pipe
Sealant
Threads of the oil pressure switch 92-809822
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 Nm lb‑in. lb‑ft
Oil pressure switch 8.0 70.8 –
Screw securing ring terminal to oil pressure switch 1.5 13.3 –
4. Coat the electrical connection with dielectric grease to prevent corrosion.
Tube Ref No. Description Where Used Part No.
6
Dielectric Grease Oil pressure switch electrical connection 92-823506 1
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 Nm lb‑in. lb‑ft
Driveshaft housing cover screws 6.0 53.1 –
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.
62990
Ignition
Page 2A-10 © 2018 Mercury Marine 90-8M0125265 eng NOVEMBER 2017