Johnston VT551 - Electrical

Page Issue 01
Chapter - Fault Diagnosis
14:3
VT551 - Maintenance
ELECTRICAL SYSTEM
FAULT SYMPTOM POSSIBLE CAUSE
Beacon not working 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
Work lights not working 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
Flap (duals) fail to operate 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
Nozzle pneumatic solenoids 1. Check feed to solenoid/plug LED V6 (LH) or V12 (RH)
fail to operate 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
Channel Brush fails to lower 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
Channel Brush fails to rotate 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
Channel Brush water 1. Check feed to solenoid/plug LED’s W3 (LH) or W8 (RH)
fails to operate 2. Check solenoid for operation/obstruction
3. Check earth wire
4. Check fuse No. 8
5. Check water pump for operation
Wide Sweep Brush fails to lower 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
Wide Sweep Brush fails to rotate 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
Wide Sweep Brush water 1. Check feed to solenoid/plug LED W1
solenoid fails to operate 2. Check solenoid for operation/obstruction
3. Check earth wire
4. Check fuse No. 8
5. Check switch using J-plex screen
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