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Mercury MerCruiser MCM 7.4L MPI User Manual

Mercury MerCruiser MCM 7.4L MPI
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GENERAL SYSTEM DIAGNOSTICS SERVICE MANUAL NUMBER 23
Page 5E-60 90-861326--1 MARCH 1999
Chart A-1 (4 of 4): No Malfunction Indicator Lamp (MIL) - Marine Diagnostic
Trouble Code (MDTC) Tool Installed
Step Action Value(s) Yes No
10
Locate and repair open or short to
ground in CKT 440.
Is Action Complete?
_
Go to OBD
System Check
__
11
Repair or replace faulty Marine
Diagnostic Trouble Code tool.
Is Action Complete?
_
Go to OBD
System Check
__
12
1. Locate and repair faulty ECM
grounds.
2. If a problem is found, repair as
necessary.
Is Action Complete?
_
Go to OBD
System Check
Go to Step 17
13
Locate and repair open in CKT
419.
Is Action Complete?
_
Go to OBD
System Check
__
14
Locate and repair short to ground
in the battery feed circuit.
Is Action Complete?
_
Go to OBD
System Check
__
15
Locate and repair open in the
circuit that did not light the test
light.
Is Action Complete?
_
Go to OBD
System Check
_
16
Locate and repair short to ground
in CKT 439.
Is Action Complete?
_
Go to OBD
System Check
_
17
Repair faulty ECM connections or
replace faulty ECM.
Is Action Complete?
_
Go to OBD
System Check
_
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Mercury MerCruiser MCM 7.4L MPI Specifications

General IconGeneral
BrandMercury
ModelMerCruiser MCM 7.4L MPI
CategoryEngine
LanguageEnglish

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