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
Ye s
Check the function of the main ON/OFF switch.
Is
the switch
functioning?
No
Ye s
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
Ye s
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.
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