DIAGNOSTICS
SERVICE MANUAL NUMBER 24
Code 45 (1 of 2): Ignition Coil Driver Fault
ECM
MEFI 3
B+
902 RED
121 WHT
J1-2
121 WHT
+
–
IGNITION
COIL
TO IGN
TEMP SENDER
121
WHT
A
B
C
F
E
208 BRN
J2-20
J2-8
9
01 TAN
585 TAN/WHT
29 DK GRN
J1-26
3
PNK
D
CIRCUIT DESCRIPTION:
On MEFI 3 product, the coil driver circuitry is integrated into the ECM. When the engine is
running, a diagnostic check of the coil drive circuitry is constantly taking place. If the diag-
nostic system detects excessive current to the coil through CKT 121, a fault code will set
although the engine should continue to operate.
DIAGNOSTIC AIDS
Check for the following conditions:
•
Poor connection at ECM. Inspect harness connectors for backed out terminals,
improper mating, broken locks, improperly formed or damaged terminals, and poor
terminal to wire connection.
•
•
•
Damaged harness. Inspect the wiring harness for damage.
Shorted CKT 121 or tach lead in harness.
Damaged ignition coil or improper coil. The ignition system is calibrated for Mercury
approved coils only.
Index
Page 5G-84
90-861327--1 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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