Troubleshooting guide

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 m ode i s a normal operating condition and will not affect engine life or

performance. Note: T rucks 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 t o 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.Ifthe

derate occurs m ore than Typical for given operating conditions, c ontinue 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 .Page5–9.

2. Perform Test A .Page5–7.

3. Te st 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 .Page5–8.

5-4 All information subject to change without notice. (Rev. April 2004)