Page Issue 01
Chapter - Fault Diagnosis
14:5
VT551 - Maintenance
AUXILIARY ENGINE
FAULT SYMPTOM POSSIBLE CAUSE
Auxiliary engine fails to turn over 1. Check truck ignition is on
2. Check battery and connections
3. Check ignition switch
4. Check starter motor
Auxiliary engine starts 1. Check feed to actuator
but will not accelerate 2. Check fuse
3. Check switch using J-plex screen
Auxiliary engine turns 1. Check fuel tank
over but will not start 2. Check electric feed to engine injector shut off
fuse 2
3. Check injector shut off valve
4. Check fuel lines for loose connections
5. Check oil pressure sender and connections
6. Check water temperature sender
7. Bleed fuel system
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