Mercury MerCruiser MCM 454 Mag MPI Service Manual page 772

SERVICE MANUAL NUMBER 23
Code 41 (3 of 3): Ignition Control (IC) Circuit (Non-Scan) - Open IC Circuit
Index
90-861326--1 MARCH 1999
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STEP
4 1. Reconnect ECM.
2. Start engine and idle for 2 minutes or un-
til Marine Diagnostic Code Tool indicates a
trouble code.
3. Ignition "ON," engine "OFF."
4. Switch Marine Diagnostic Code Tool to
"Service Mode" and note trouble code.
Is trouble code 41 present?
Locate and repair open in CKT 423. If a
5
problem is found, repair as necessary. Was a
problem found?
Replace faulty distributor ignition module. Is
6
action complete?
Repair faulty ECM connections or replace
7
faulty ECM. Is action complete?
Trouble code 41 is intermittent. Refer to "Diag-
nostic Aids" on facing page. Check harness
8
and connectors for an intermittent open in CKT
423.
ACTION
TROUBLE CODE DIAGNOSTICS - 7.4L MPI
VALUE YES
PROCEED TO
– Step 7
–
Verify Verify
–
Repair
–
– –
Page 5G-27
NO
Step 8
Step 6
–
–
–