BMW 745i Repair Instructions page 62

Starter motor turns, engine does not start, fuel system okay
Pull wire 4 out of distributor and hold against ground,
operate starter, ign. spark length ca. 10 mm (0.394'"
yes
Spark plugs, distr. cap/
rotor and ign. wires
okay
yes
Voltage against ground
at ign. coil term. 15
greater than 3.0 volts
yes
Dwell angle at
1500 rpm 32 ..
. 53 0
6000 rpm 43 .. . 56
0
no Replace defective
parts
no.. Ballast resistor or
ignition coil defec·
tive
no~
Pulse sensor okay
. r
yes
no
no
TROUBLESHOOTING BREAKERLESS TRANSISTOR IGNITION
IMPORTANT! Always stop engine and turn off ignition prior to
doing any work on a transistor ignition system. DANGER!
- - - -
Pull off black/red wire from starter term. 16 to 0.4 ohm resistor .
I _
no [ Break in wire from starter to ballast
Connect voltmeter. Operate starter. Voltage = battery voltage . resistor or start relay
yes
Adiust gap between rotor and stator
to 0.35 ... 0 .70 mm (0.014 _ .. 0.028"
Disconnect sensor wire at plug and connect voltmeter (, r ed to
term. 7 and black to term. 31 dL At least 0.05 V shown at
L- s_ t a_rt _ e ~r_s_pee
__ d_ . _ _ _ _ _ ---...--_ _ _ _ _ _ _
~
_ _ _ _
-~
n01 Break in sensor wire
'-....I
Voltage above 2.0 V
I I ..............~~
J
yes
yes
yes
"i
Pulse sensor okay
no
Break in wiring to igni·
tion lock
Break in wiring to igni·
tion coil term. 1
Make ground connec·
tion
nOi
Replace pulse sensor
L-~~~~~~~~~--~~