1C-6 Engine Electrical Devices:
ECM Power Source Line
Z9J0111301002
The ECM is battery dependent and must be provided
with its own dedicated 12 V power supply. The electrical
circuits which provide this supply are:
1. The sub battery cable to the white lead wire in the
remote control extension harness to the ignition
switch.
When the ignition switch is turned “ON”, battery
power passes from the white lead wire, through the
ignition switch contacts to the gray output lead wire
to the No. 15 and 36 terminals of the ECM.
NOTE
Ensure that the battery cable connections are
clean and secure.
A failure at the battery connection will cause
incorrect operation of the ECM and starter
motor cranking system.
2. The engine wiring harness to the main relay.
When the ECM main relay is energized, by turning
the ignition switch “ON”, battery voltage is supplied
to the No. 12 terminal of the ECM.
Main Harness Capacitor
This capacitor stabilizes the voltage in the engine control
system circuit.
• If a “short” occurs in this circuit, the sub battery cable
fuse will blow causing the engine control system to be
inoperative.
• If an “open” occurs in this circuit, the cranking system
will not function.
1. Starter motor 5. ECM main relay
2. Main battery cable 6. 15 amp. fuse
3. 40 amp. fuse 7. Sub-battery cable
4. 30 amp. fuse 8. Battery
BATT
ECM
IG
GND
12
36
Gr
W
W
R
W
B
Gr
B
Gr
B/Bl
B/G
15
W
35
R/B
1
2
7
34
5
8
6
I9J011130005-03
1. Main harness capacitor
1
I9J011130038-01
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