DV11
Operation and Maintenance
150
Common Rail Fuel-injection System
Printed in Mar. 2005 PS-MMA0608-E1A
7) Engine brake housing oil pressure check
Oil pressure must be sufficient to compress the control valve return spring and
the master piston return spring. Oil supply pressure that only partially compresses
these springs will result in little or no brake performance.
3.6.10. General problem
1) Engine fails to start
Possible cause : Solenoid valve stuck in open position.
Correction : Ensure that electrical current is off to engine brakes. If solenoid
valve remains open (pin down) with current off, replace
solenoid valve.
2) Engine brake will not operate
Possible cause : No electrical current to solenoids.
Correction : Ensure electrical current is supplied from ECU. Look for short
circuit in wiring. Replace any broken wires. Check solenoid
for signs of shorting, replace if necessary. Replace fuse or
circuit breaker if necessary.
CAUTION:
Do not touch electrical connection when system is energized.
Possible cause : Incorrect electrical power source.
Correction : Power supply must be a minimum of 18 VDC at the sole
noid.
Possible cause : Low engine oil pressure.
Correction: Determine oil pressure at engine brakes using procedures
given in this manual. If oil pressure is below specifications,
engine should be repaired.
3) Engine brake activates with switches off or stays
Possible cause : High oil pressure (above 7 bar) will force solenoid valve o
pen.
Correction : Repair engine so that oil supply is within specifications.
Possible cause : Control valve Inner spring broken.
Correction : Replace inner spring.
Possible cause : One or more control valves stuck in “on” or up position.
Correction : Check control valves for binding. Remove and clean or re
place if necessary. Inspect lube oil for contaminants.
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