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.
Summary of Contents for GP 3800A
Page 2: ......
Page 13: ...GP Repair Safety Information wc_si000169gb fm 9 1 4 Label Locations GND 88897...
Page 25: ...GP Repair Technical Data wc_td000169gb fm 21 Notes...
Page 50: ...Maintenance GP Repair wc_tx000546gb fm 46 4 11 Electrical Schematic GP 2500A...
Page 52: ...Maintenance GP Repair wc_tx000546gb fm 48 4 13 Electrical Schematic GP 3800A 0620010 rev 104...
Page 54: ...Maintenance GP Repair wc_tx000546gb fm 50 4 15 Electrical Schematic GP 3800A 0620010 rev 103...
Page 60: ...Maintenance GP Repair wc_tx000546gb fm 56 4 21 Electrical Schematic GP GPS 5600A 6600A rev 104...
Page 62: ...Maintenance GP Repair wc_tx000546gb fm 58 4 23 Electrical Schematic GP GPS 5600A 6600A rev 103...
Page 68: ...Maintenance GP Repair wc_tx000546gb fm 64 4 29 Engine Schematic all GP GPS 3800A 5600A 6600A...
Page 70: ...Maintenance GP Repair wc_tx000546gb fm 66 Notes...
Page 77: ...GP Repair Troubleshooting wc_tx000548gb fm 73 wc_gr003415 z y...
Page 87: ...GP Repair Troubleshooting wc_tx000548gb fm 83 Notes...
Page 95: ...GP Repair Troubleshooting wc_tx000548gb fm 91 wc_gr003148 b c d a...
Page 112: ...Troubleshooting GP Repair wc_tx000548gb fm 108 Notes...
Page 115: ...GP Repair Disassembly Assembly Procedures wc_tx000549gb fm 111 wc_gr003136 c e f f h f g a b d...
Page 119: ...GP Repair Disassembly Assembly Procedures wc_tx000549gb fm 115 wc_gr003138 a d e c b f g i h...
Page 121: ...GP Repair Disassembly Assembly Procedures wc_tx000549gb fm 117 wc_gr003139 d d c c e f a b...
Page 123: ...GP Repair Disassembly Assembly Procedures wc_tx000549gb fm 119 wc_gr003141 c a b d e f...
Page 124: ...Disassembly Assembly Procedures GP Repair wc_tx000549gb fm 120...
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