SERVICE MANUAL NUMBER 24
DIAGNOSTICS
Chart A-7 (2 of 6): Ignition System Check
MEFI 3 (EXCEPT BLACK SCORPION)
DISTRIBUTOR
WHT/GRN
WHT/RED
ECM
MEFI 1 MEFI 3
MEFI 2
439
PNK
J2-10
J1-2
430
PPL/WHT
B+
902 RED
121 WHT
121 WHT
+
–
IGNITION
COIL
TEMP SENDER
121
WHT
MEFI 1 MEFI 3
MEFI 2
A
B
C
F
E
D
208 BRN
J2-20
J2-8
901 TAN
585 TAN/WHT
IGNITION
3 PNK
29 DK GRN
J1-26
CIRCUIT DESCRIPTION MEFI 3:
The Distributor Ignition (Dl) system receives supply voltage from the system relay through
CKT 902 to the ignition coil positive (+) connector.
Inside the distributor, the pick-up sensor will produce a voltage signal for cylinder spark. The
voltage signals are processed in the ECM. The ECM will decide if the engine is in the crank-
ing or running mode and adjust timing accordingly.
The ECM will send a signal to the ignition coil negative (–) terminal through CKT 121. The
signal will trigger the coil creating secondary spark to be produced. This secondary spark
is sent to the distributor by a high tension lead.
Index
90-861327--1
OCTOBER 1999
Page 5G-39
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
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| Document File Type | |
| Copyright | Attribution Non-commercial |
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