DDEC IV TESTING
Low Boost Under Cold Ambient Conditions
In extreme cold ambient conditions, the engine will operate in
Condensation Protection
.
During this mode of operation, the engine
boost
will be reduced and there is no reduction of
power. Operating in this mode is a normal operating condition and will not affect engine life or
performance.
Note:
Trucks operating with winter fronts will experience this condition less often.
DDC’s recommendations have not changed regarding winterfront usage. A service bulletin issued
years ago will be re issued to restate DDC’s position.
Perform the following step for Low Boost Under Cold Ambient Conditions.
1. Clear Fault Codes and return the engine to service.
Derate Codes 110 and 404 FMI 14
Perform the following steps for
Derate Codes 110 and 404 FMI 14
.
1. Determine if derate is typical operation (refer to Appendix D,
Service Information Letter
03 TS-23).
NOTE:
During
Typical
engine operating conditions, the engine will derate to prevent damage.
Higher ambient temperatures and loads will increase the frequency of DDEC applying
this derate logic. If the derate is occurring only occasionally, this is
Typical
. If the
derate occurs more than
Typical
for given operating conditions, continue investigation
for possible defects.
[a]
If considered
Typical
, clear Fault Codes and return the engine to service.
[b]
If determined to be abnormal frequency, perform step 2.
2. Remove the water pump and inspect the pump impeller.
[a]
If the impeller is damaged, replace the water pump.
[b]
If the impeller is not damaged, reuse the water pump and replace the EGR cooler.
Code 39
Perform the following steps for
Code 39
.
1. Perform
Exhaust Gas Recirculation System Basic Checks
. Page 5–9.
2. Perform
Test A
. Page 5–7.
3. Test drive the vehicle with DDDL and perform a snapshot. Analyze the snapshot.
4. Inspect the VPOD air supply for leaks.
[a]
If the VPOD air supply has leaks, repair the leak.
5. Perform
Test B
. Page 5–8.
5-4
All information subject to change without notice.
(Rev. April 2004)
7SE60 0404
Copyright © 2004 DETROIT DIESEL CORPORATION