Diagnostic Circuit Check
The scan tool data listed in the table may be used for
comparison. After completing the diagnostic circuit
check and finding the on-board diagnostics function-
ing properly and no trouble codes displayed. The
“Typical Data Values” are an average of display val-
ues recorded from normally operating vessels and
areintendedtorepresentwhatanormallyfunctioning
system would typically display.
The Diagnostic Circuit Check is an organized ap-
proach to identifying a problem created by an elec-
tronic engine control system malfunction. It must be
the starting point for any driveability complaint diag-
nosis because it directs the service technician to the
next logical step in diagnosing the complaint.
NOTE: A scan tool that displays faulty data should
not be used, and the problem should be reported to
the manufacturer. The use of a faulty scan tool can
result in misdiagnosis and unnecessary parts re-
placement.
Only the parameters listed below are used in this
manual for diagnosing. If a scan reads other parame-
ters, the values are not recommended for use in diag-
nosing. If all values are within the range illustrated,
refer to “Troubleshooting.”
Scan Tool Normal Specifications
(Idle / Warm Engine / Closed Throttle / Neutral)
Scan Position
RPM
Units Displayed
RPM
Typical Data Value
600-700 RPM
Desired RPM
Coolant Temp.
Manifold Air Temp.
Throttle Position
Throttle Angle
RPM
600 RPM
° F(° C)
° F (° C)
Volts
150-170° F (66-77° C)
Varies with Ambient Temperature
.4 to .8 Volts
0-100 %
0-1%
1-3
Vacuum and Baro Pressure)
Volts or (45-55 kPa) (Depends on
MAP
Baro
Volts or kPa
Volts or kPa
3-5
Volts (Depends on Altitude and
Barometric Pressure)
12.0-14.5 Volts
-10 to 30°
Bat
Volts
Spark Advance
Degrees
Knock Retard
Degrees
0°
Idle Air Control IAC
Minimum IAC Position
Idle Air Control Follower
Injector Pulse Width
Counts (Steps)
Counts (Steps)
Counts (Steps)
msec.
0-40 Counts
0-40 Counts
0 Counts
2-3 msec.
2.5–3.5
Temperature)
msec. (Depends on Water/Air
Injector On Time Cranking
msec.
Fuel Consumption
GPH (L/h)
1-2 GPH(3.7-7.5 L/h)
Time From Start
0:00:00-1092:00
Calibration and Check Sum
OK/LO
Varies
Memory Calibration Check Sum
Oil Press/IO Level (See Note)
Engine Overtemp
Varies with Software revision in ECM
OK
OK/Overheating
OFF/ON
OK
Power Reduction Mode
Lanyard Stop Mode
OFF
OFF
OFF/ON
NOTE: MCM will read I/O Level and MIE will read Trans.
Index
90-823224--2 796
ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5C-49
| 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