Throttle Body Injection and
Multi-Port Injection Sensor
and Module Servicing
REMOVAL
1. Disconnect J1 and J2 electrical connectors at en-
gine control module (ECM).
Precautions
!
WARNING
BEFORE attempting to disconnect and remove
any module or sensor, check to make sure that
the engine ignition system is OFF. Then discon-
nect the negative (–) battery cable from the termi-
nal. DO NOT reconnect the negative (–) battery
cable until the module or sensor removed has
been re-installed with secure connections.
a
IMPORTANT: Modules and sensors are electrical
devices easily damaged by contact with liquid
cleaners or solvents. Clean with a dry cloth un-
less specifically directed to do otherwise.
Electronic Control Module (ECM)
d
c
IMPORTANT:TheECMisasensitiveelectricalde-
vice, subject to electrostatic damage. Therefore,
take care not to touch connector pins when re-
moving or installing the module.
b
72801
a - Electrical Bracket
b - ECM
NOTICE
Refer to “Service Precautions,” in “Repair
Procedures,” BEFORE proceeding.
c - J1- Electrical Connector (Front Connector)
d - J2- Electrical Connector (Rear Connector)
2.
Remove ECM from electrical bracket.
CLEANING AND INSPECTION
1.
Clean the exterior of the ECM with a dry cloth be-
ing careful to avoid contact with connector pins.
2.
3.
Inspect outer surfaces for any obvious damage
Visually inspect electrical pins at both ends of
ECM for straightness and corrosion.
4.
Visually inspect J1 and J2 connectors on the wir-
ing harness for corrosion and terminals that may
have backed of the harness.
NOTE: The ECM is a sealed electrical component. If
a Code 51 check has shown it to be defective, re-
placetheunitwithanotherECMhavingthesamepart
number and service number as the original.
Index
5C-170 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
90-823224--2 796
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
Thank you