Johnston VT551 Maintenance Section page 89

VT551 - Maintenance
FAULT SYMPTOM
Beacon not working
Work lights not working
Flap (duals) fail to operate
Nozzle pneumatic solenoids
fail to operate
Channel Brush fails to lower
Channel Brush fails to rotate
Channel Brush water
fails to operate
Wide Sweep Brush fails to lower
Wide Sweep Brush fails to rotate
Wide Sweep Brush water
solenoid fails to operate
Page Issue 01
ELECTRICAL SYSTEM
POSSIBLE CAUSE
1. Check vehicle ignition is on
2. Check beacon bulb/motor
3. Check feed to beacon
4. Check earth wire
5. Check fuse No. 15 or 6 for additional beacons
6. Check switches
7. Check multi plugs to beacon
1. Check vehicle ignition is on, master switch V is illuminated
2. Check bulb
3. Check feed to light
4. Check earth wire
5. Check fuse No. 13
6. Check switch
1. Check feed to solenoid/plug LED's V15 (LH) or V17 (RH)
2. Check solenoid manual override on V15 or V17
3. Check earth wire on pin 13 plug VM
4. Check fuse No. 10
5. Check switch using J-plex screen
1. Check feed to solenoid/plug LED V6 (LH) or V12 (RH)
2. Check solenoid manual override
3. Check earth wire on pin 13 plug VM
4. Check fuse No. 10
5. Check switch using J-plex screen
1. Check feed to solenoid/plug LED V5 (LH) or V11 (RH)
2. Check solenoid
3. Check earth wire on pin 13 plug VM
4. Check fuse No. 10
5. Check switch using J-plex screen
1. Check feed to solenoids/plug LED Y1 (LH) or Z1 (RH) for
operation
2. Check solenoid
3. Check earth wire
4. Check fuse No. 12
5. Check switch using J-plex screen
1. Check feed to solenoid/plug LED's W3 (LH) or W8 (RH)
2. Check solenoid for operation/obstruction
3. Check earth wire
4. Check fuse No. 8
5. Check water pump for operation
1. Check feed to solenoids/plug LED's
2. Check solenoids V23 and V24
3. Check earth wire at pin 13 plug VM
4. Check fuse No. 10
5. Check switch using J-plex screen
1. Check feed to solenoid/plug LED valve C1 for operation
2. Check coil for operation
3. Check earth wire
4. Check fuse No. 12
5. Check switch using J-plex screen
1. Check feed to solenoid/plug LED W1
2. Check solenoid for operation/obstruction
3. Check earth wire
4. Check fuse No. 8
5. Check switch using J-plex screen
Chapter - Fault Diagnosis
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