Service manual

7-17
E
– +
ELEC
IGNITION SYSTEM
IGNITION SYSTEM PEAK VOLTAGE
WARNING
When checking the electrical components,
do not touch any of the connections of the
digital tester lead wires.
NOTE:
• If there is no spark, or the spark is weak,
continue with the ignition system test.
• If a good spark is obtained, the problem is
not with the ignition system, but possibly with
the spark plug(-s) or another component.
1. Measure:
• ECM output peak voltage
Below specification
→
Measure the
pulser coil output peak voltage.
Replace the ECM.
NOTE:
B/R – Ground for cylinder #1 and #4.
B/W – Ground for cylinder #2 and #3.
To crank the engine, connect the engine shut-
off cord (lanyard), and then press the start
switch and engine stop switch simultaneously.
Test harness (2 pins):
YB-06792/90890-06792
ECM output peak voltage:
Black/red (B/R) – Ground
Black/white (B/W) – Ground
r/min
Loaded
Cranking 2,000 3,500
V 7 258 258