ECM Connector and Symptom Charts
The following chart will aid in diagnosis of symptoms. These voltages were derived from a known good engine.
The voltages shown were done with the electrical system intact and operational. These are voltage requirements
to operate the different circuits.
!
CAUTION
Do not attempt to obtain these voltages by probing wires and connectors. Serious damage could
result in loss of engine operation or wiring damage. Voltages can vary with battery conditions.
a
J-1
J-1 Front Pin 32 Pin Input Connector
a
J-2
J-2 Rear 32 Pin Output Connector
a - Shaded Area Denotes Pin Connector Location Used On
Terminal
THESE NOTES APPLY TO FOLLOWING ECM
CONNECTOR AND SYMPTOM CHARTS.
The “B+” Symbol indicates a system voltage
(battery).
NOTE: The Intake Air Temperature (IAT) Sensor
[J1-24], Port Fuel Jumper J2-7 and J2-22] is not used
on the 7.4L / 7.4LX Throttle Body Injection system
NOTE 1: Battery voltage for first two seconds,
then 0 volts.
IMPORTANT: The following conditions must be
meet before testing.
NOTE 2: Varies with temperature.
NOTE 3: Varies with manifold vacuum.
NOTE 4: Varies with throttle movement.
NOTE 5: Less than .5 volt (500 mV).
1.
2.
3.
Engine at operating temperature.
Ignition on or engine running.
Scan tool not connected.
NOTE 6: Dual or multiple engines must share a com-
mon ground (–) for proper serial data communica-
tions.
Index
90-823224--2 796
ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5C-29
| 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.
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