Component
Condition
Test
Repair
Secondary circuit
Wet coil
Corroded coil
connections
Secondary circuit
Check for water leak.
Check resistance
values (see
Table
e
).
Ignition coil
Primary or secondary
circuit on or shorted
Housing cracked,
damaged
Primary and
secondary circuits
(see
Table e
)
Replace coil as
necessary.
Ignition coil harness
connector
Power supply,
primary control circuit
or ground (shunt
signal) circuits
impaired
Primary ignition and
terminal 4A feedback
preset measurements
Look for open, loose
connector, corrosion,
crossed or damaged
connector pins.
Inspect ignition
unloader relay.
Replace coils as
necessary.
Warnings and cautions
The engine management system
contains sensitive electronic components.
To protect the system and for general
safety, the following warnings and
cautions should be observed during
ignition system troubleshooting,
maintenance or repair work.
WARNING!
Do not touch or disconnect any
cables from the coils while the
engine is running or being
cranked by the starter.
The ignition system produces
high voltages that can be fatal.
Avoid contact with exposed
terminals. Use extreme caution
when working on a car with the
ignition switched on or the engine
running.
Ignition System
http://ebahn.bentleypublishers.com/BMW/3/E46/Repair%20Manuals/1...
9 of 11
2/25/2009 9:54 PM
Summary of Contents for 1999-2005 M3
Page 1: ......
