DIAGNOSTICS
SERVICE MANUAL NUMBER 24
Diagnostic Circuit Check
IMPORTANT: All references to Scan Tool work with either the Quicksilver Digital Diag-
nostic Tool or the Rinda Scan Tool.
The Diagnostic Circuit Check is an organized approach to identifying a problem created by
an electronic engine control system malfunction.
NOTE: A scan tool that displays faulty data should not be used. This could result in misdiag-
nosis and unnecessary parts replacement.
The scan tool data listed in the following table may be used for comparison after finding the
on-board diagnostics functioning properly and no trouble codes displayed. The “Typical
Data Values” are intended to represent what a normally functioning system would display.
Only the parameters listed in the scan position column below are used in this manual. If a
scan reads other parameters, the values are not recommended for use in diagnosing. If all
values are within the range illustrated, refer to “Troubleshooting.”
Scan Tool Normal Specifications (Idle/Warm Engine/Closed Throttle/Neutral)
Scan Position
Units Displayed
Typical Data Value
600-700 rpm
rpm
rpm
Desired rpm
rpm
600 or 650 rpm (Depends on Model2)
Coolant Temp.
Manifold Air Temp.
Throttle Position
Throttle Angle
° 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
on Vacuum and Baro Pressure)
Volts or (45-55 kPa) (Depends
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
Air Temperature)
msec. (Depends on Water/
Injector On Time Cranking
msec.
Fuel Consumption
Time From Start
GPH (L/h)
1-2 GPH(3.7-7.5 L/h)
Varies
0:00:00-1092:00
Memory Calibration Check
Sum
Calibration Check Sum Varies with Software revision in ECM
Oil Press/IO Level1
OK/LO
OK
Engine Overtemp
OK/Overheating
OFF/ON
OK
Lanyard Stop Mode
OFF
1
2
: MCM will read I/O Level and MIE will read Trans.
: Refer to “Engine and Tune-Up Specifications.”
Index
Page 5G-4
90-861327--1 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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