Service manual

69J1D11
8-12
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Checking the ECM
1. Remove the ignition coil cover and dis-
connect the ignition coil coupler.
2. Connect the test harness (2 pins) to the
ignition coil.
3. Measure the ECM output peak voltage. If
below specification, measure the pulser
coil output peak voltage. Replace the
ECM if the output peak voltage of the
pulser coil is above specification.
Checking the pulser coil
1. Remove the flywheel magnet cover and
disconnect the pulser coil coupler.
2. Connect the test harness (4 pins) to the
pulser coil.
3. Measure the pulser coil output peak volt-
age. Replace the pulser coil if below
specification.
Checking the throttle position
sensor
1. Connect the test harness (3 pins) to the
throttle position sensor.
2. Turn the engine start switch to ON.
3. Measure the throttle position sensor
input voltage. Replace the ECM if out of
specification.
4. Measure the throttle position sensor out-
put voltage. Adjust the throttle position
sensor if out of specification.
Digital multimeter: YU-34899-A
Peak voltage adaptor: YU-39991
Test harness (2 pins): YB-06792
ECM output peak voltage:
Black/orange (B/O) – Ground
Black/yellow (B/Y) – Ground
Black/white (B/W) – Ground
r/min
Loaded
Cranking 1,500 3,500
DC V 252 260 260
S69J8180
Digital multimeter: YU-34899-A
Peak voltage adaptor: YU-39991
Test harness (4 pins): YB-06771
Pulser coil output peak voltage:
White/red (W/R) – Black (B)
White/black (W/B) – Black (B)
White/green (W/G) – Black (B)
r/min
Unloaded Loaded
Cranking 1,500 3,500
DC V 5.3 5.3 20 43
Pulser coil resistance (use as
reference):
White/red (W/R) – Black (B)
White/black (W/B) – Black (B)
White/green (W/G) – Black (B)
459–561
Ω
at 20 °C (68 °F)
S69J8190
Ignition and ignition control system