Troubleshooting guide

DDEC IV TESTING

Engine Coolant Loss

Perform the following steps for Engine Coolant Loss.

1. Verify the quantity of engine coolant loss per mile.

NOTE:

_______________Miles driven_______________Coolant added

PRESSURIZED AIR AND FLYING PARTICLES

To avoid injury to eye or face, wear a face shield o r goggles

when conducting a pressure test.

2. Pressure test the cooling sy stem.

3. Visually inspect the engine for external coolant leaks (e.g. water pump, coolant hoses,

etc.).

[a] If coolant leaks were detected, replace the leaking component as required.

[b] If no coolant leaks were detected, perform step 4.

4. Visually inspect the engine oil for coolant.

[a] Coolant is found in the engine oil, this indicates an oil cooler or internal engine fault.

[b] If no coolant is found, perform step 4[c].

[c] If the engine is losing coolant at a rate of more than 1 gallon in in 5000 miles, and no

engine coolant leaks were detected, replace the EGR cooler.

[d] If the engine is losing coolant at a rate of less than 1 gallon in 5000 miles, contact the

Detroit Diesel Technical Service Group.

Engine Backfire, Engine Misfire, Intermittent Exhaust Smoke

Perform the following steps for E ngine Backfire, Engine Mi sfire, and Intermittent Exhaust

Smoke.

1. Reprogram the ECM.

5-6 All information subject to change without notice. (Rev. April 2004)