Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2002 Freightliner Sprinter 3500 L5-2.7L DSL TurboFACTORY OEM SERVICE PROCEDURE
Engine Control Module: Testing and Inspection
Test 1 - 2:
Test 3 - 6:
Test 7 - 10:
Test 11 - 14:
Test 15 - 16:
SYMPTOM
CHECKING THE POWER AND GROUNDS
POSSIBLE CAUSES
- Checking the engine control relay system
- ECM ground circuit(s) open
- ECM output shorted - fuse 16
- ECM output shorted - fuse 17
- EGR valve/crankcase heater
- Engine control relay
- Engine control relay B+ supply
- Engine control relay output circuit(s) open
- Engine control relay output CKT shorted to ground fuse #16
- Engine control relay output CKT shorted to ground fuse #17
- Engine control relay signal circuit open
- Fuse block no.1
- Ignition switch start output circuit open
- Ignition switch start/run output circuit open
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.