GENERAL SYSTEM DIAGNOSTICS
SERVICE MANUAL NUMBER 23
Chart A-1 (2 of 4): No Malfunction Indicator Lamp (MIL) - (MDTC) Tool Installed
DIAGNOSTIC AIDS:
An intermittent may be caused by a poor connection, rubbed through wire insulation or a
wire broken inside the insulation. Check for the following items:
•
Inspect the ECM harness and connectors for improper mating, brokenlocks, improperly
formed or damaged terminals, poor terminal to wire connection, and damaged harness.
If the engine runs OK, check for a faulty light bulb or an open in the MIL driver circuit (CKT
If the engine cranks but will not run, check for an open ECM ignition or battery feed
or a poor ECM to engine ground.
419).
TEST DESCRIPTION:
Number(s) below refer to the step number(s) on the Diagnostic Table:
3.
4
This step ensures that battery voltage is available to terminal “F” of the DLC connector.
. This step checks for ground present at terminal “E” of the DLC connector. This indicates
the ECM is capable of completing the ground to the MIL.
5
7
. This step isolates the cause of an incomplete ground circuit to either faulty wiring or
faulty ECM circuitry.
. This step ensures that battery voltage is available to the ECM.
Index
Page 5E-58
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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