Mariner Mercury 105/140 JET, Service Manual

Page: 217 / 797

3C-10 - FUEL SYSTEMS 90-824052R3 JUNE 2002
Outboard Powerhead View
Engine port view of EFI components.
a
g
e
h
d
f
51784
b
c
a - Electric Fuel Pump
b - Fuel Pressure Regulator
c - Vapor Separator
d - Engine Head Temperature Sensor
e - Lube Alert Module
f - Idle Stabilizer Module
g - Detonation Control Module (200)
h - Detonation Sensor (200)
Engine front view of EFI components.
51793
a
b
c
d
e
a - Electronic Control Module (ECM)
b - Final Filter
c - Electric Fuel Pump
d - ECU harness
e - Water Sensing Module
Engine starboard view of EFI components.
51793
b
a
c
d
e
a - Electronic Control Module (ECM)
b - ECM Harness
c - Engine Harness
d - Throttle Position Sensor Harness
e - Water Separating Filter
Electronic Fuel Injection
(EFl) System
Introduction
The troubleshooting information provided here
consists of preliminary checks (checks to be followed
before proceeding with EFI tests), diagrams (fuel
flow and electrical wiring), component description
(from diagrams), flow charts (low pressure fuel
delivery, high pressure fuel delivery, fuel delivery vs.
electrical delivery), problem diagnosis, and a series
of test and check procedures that will help isolate
problems associated with the fuel injection system.
Each test/check (listed) can be completed without
major fuel system disassembly.
Using the Test Procedures
Each test procedure is divided into three parts. The
first part “PURPOSE” tells what this test will
accomplish. “PROCEDURE” provides detailed steps
for performing the test. “RESULTS” discusses the
results obtained by the test and how to correct the
problem or where to go next in the troubleshooting
procedure if more information is needed. Read the
entire test before beginning to perform outlined
procedures. Study the RESULTS material prior to
testing. This will help in determining that each test is
providing desired results.