GENERAL SYSTEM DIAGNOSTICS
SERVICE MANUAL NUMBER 23
On-Board Diagnostic (OBD) System Check (Scan)
Step
Action
Value(s)
Yes
No
1.
2.
Ignition “ON,” engine “OFF.”
Install
Marine
Diagnostic
Trouble Code (MDTC) tool and
switch it to “Normal Mode.”
Observe the Malfunction Indica-
tor Lamp (MIL).
-
1
3.
Go to Step 2
Is the MIL “ON”?
Go to Chart A-1
1.
2.
3.
4. Attempt to display ECM data
with the scan tool.
Ignition “OFF.”
Install a scan tool.
Ignition “ON.”
-
2
Does The Scan Tool Display ECM
Data?
Go to Step 3
Go to Step 7
Attempt to start the engine.
-
-
3
4
Did
The
Engine
Start
And
Go to Step 4 Go to Chart A-3
Continue To Run?
Select “Display DTCs” with the scan
tool.
Go to
applicable
DTC Chart
Go to Step 5
Are Any Trouble Codes Stored?
Compare
ECM
data
values
displayed on the scan tool to the
typical scan tool data values page.
Are The Displayed Values Normal
Or Close To The Typical Values?
Refer to
“Trouble-
shooting”
section
-
5
Refer to
“Diagnostic
Testing”
1.
2.
3.
Ignition “OFF.”
Disconnect the ECM.
Check the serial data CKT 461
for an open, short to ground, or
short to voltage. Also, check the
DLC battery feed circuit for an
open or short to ground and the
DLC ground CKT 450 for an
open.
-
-
6
7
4.
If a problem is found, repair as
necessary.
Repeat OBD
System
Check
Go to Step 7
Was A Problem Found?
Replace the ECM.
Repeat OBD
System
Check
Is Action Complete?
-
Index
Page 5E-56
90-861326--1 MARCH 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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Marine readers have rated Mercury MerCruiser GM V8 GM V8 454 CID 7.4L and 502 cid 8.2L Marine Engines Service Manual Number 23 5.0 out of 5.0 based on 1 product reviews. Just need the manual. Wrote review. Can't technically review what I haven't seen yet...