GP Repair
Troubleshooting
wc_tx000548gb.fm
105
6.25 Engine Backfires—Troubleshooting Flowchart 5A
wc_gr003116
Engine Backfires
Checking Anti-Afterfire Solenoid (AAS) circuit
With the engine running, probe wires G & W at
the connections for the AAS. Shutdown the
engine and measure voltage at shutdown.
There should be 18±2VDC.
Is
correct voltage
measured?
No
Yes
Check the function of the main ON/OFF switch.
Is
the switch
functioning?
No
Yes
Replace the
main ON/OFF
switch.
Confirm the solenoid is malfunctioning by
measuring its coil’s resistance.
Replace the AAS if needed.
Check capacitance of capacitor.
Is
correct capacitance
measured?
No
Yes
Replace the
capacitor.
Check the wiring of the AAS circuit. Start with
the DC winding. Check continuity through the diode,
fuse, main ON/OFF switch, AAS wiring, capacitor,
and back to the DC winding.
Содержание GP 3800A
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