TP-6519 8/1764 Section 5 Component Testing and Adjustment
f. Verify the magnetic pickup air gap after
tightening the locknut.
g. Reinstall the engine blower housing.
h. Reinstall the junction box and housing panels
removed to gain access to the front of the
engine.
A-358000B-C
1
2
3
4
5
1. Ignition module
2. Air gap, 0.5 mm (0.020 in.)
3. Top of flywheel ring gear tooth
4. Locknut
5. Magnetic pickup
Figure 5-26 Magnetic Pickup Air Gap
7. After adjusting the air gap, check the voltage again
as described in step 5. If the voltage does not
measure 1.75 VAC minimum, replace the
magnetic pickup.
8. To test controller’s governing function, disconnect
the magnetic pickup leads and open the generator
set circuit breaker.
9. Manually move the throttle shaft/governor stepper
motor fully counterclockwise (closed throttle).
10. Start the generator set. The stepper motor should
step clockwise to the wide open throttle position.
The stepper motor should remain in the clockwise
(throttle fully open) position. If the stepper motor
does not operate as described here, proceed to the
next steps to check the governor and stepper
motor.
11. Place the generator set master switch in the OFF
position. Check the stepper motor connections to
the controller. See the wiring diagrams in
Section 7.
12. Check the stepper motor coil resistance across
pins 2 and 3 and across pins 1 and 4. Only two
stepper motor leads of each coil group are used
(BLK-YEL and RED-WHT). See Figure 5-27. The
resistance per half coil is 38.5 ohms. If one of the
coils has a significantly higher resistance or is
shorted, replace the stepper motor.
PIN 3, BLK
PIN 2, YEL
PIN 5, GRN
(not used)
PIN 4,
RED
PIN 1,
WHT
PIN 6, BLUE
(not used)
SB555
Figure 5-27 Actuator Coil Group
13. If there is power and a good ground connection to
the controller and the stepper motor coil
resistances are good, but the stepper motor does
not operate as described in step 10, the problem is
with the ADC controller. Check controller
connections, fuses, wiring, and settings. Refer to
the troubleshooting procedures in Section 3.
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