Mercury MerCruiser MCM 454 Mag MPI Service Manual page 652

SERVICE MANUAL NUMBER 23
Chart A-1 (3 of 4): No Malfunction Indicator Lamp (MIL) -(MDTC) Tool Installed
Step
Index
90-861326--1 MARCH 1999
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Action
Was the "On-Board Diagnostic" (OBD)
1
System Check Performed?
Attempt to start the engine.
2
Does The Engine Start?
1. Remove Marine Diagnostic Trouble
Code (MDTC) tool.
2. Ignition "ON," engine "OFF."
3. Using a test light connected to
3
ground (–), probe terminal "F" of the
DLC.
Does The Test Light Illuminate
Brightly?
Using a test light connected to battery
positive (B+), probe terminal "E" of the
4 DLC.
Does The Test Light Illuminate
Brightly?
1. Ignition "OFF."
2. Disconnect ECM "J2" connector.
3. Using a DVOM, measure the resis-
tance between ECM harness con-
5
nector terminal "J2-31" and DLC
terminal "E."
Is The Resistance Within The
Specified Values?
Check the ECM fuse.
6
Is The Fuse Good?
1. Ignition "OFF."
2. Disconnect the ECM connectors.
3. Using a test light connected to
7
ground, probe ECM harness con-
nector pins "J1-16" and "J1-32."
Does The Test Light Illuminate
Brightly On Both Circuits?
1. Ignition "ON," engine "0FF."
2. Using a test light connected to
ground (–), probe ECM harness
8
connector pin "J1-11."
Does The Test Light Illuminate
Brightly?
Check the INJ/ECM fuse.
9
Is The Fuse Good?
GENERAL SYSTEM DIAGNOSTICS
Value Yes
(s)
-
Go to Step 2
-
Go to Step 3
-
Go to Step 4
-
Go to Step
11
0
ohms
Go to Step
17
-
Go to Step 7
-
Go to Step 8
-
Go to Step
12
Go to Chart
_-
A-6
No
Go to OBD
System Check
Go to Step 6
Go to Step 10
Go to Step 5
Go to Step 13
Go to Step 14
Go to Step 15
Go to Step 9
Go to Step 16
Page 5E-59