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Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 5425
Experience:  Owner at DJ Wilson
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Im taking out a ddec 2 and putting In a ddec 3 into a 1990

Customer Question

im taking out a ddec 2 and putting In a ddec 3 into a 1990 kenworth both engines are 11.1 using ecm and harness off old engine will start on either and has good fuel pressure but wont run with out either not gitting fire to injectors what could the problem be
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Daniel Wilson replied 1 year ago.

Hi my name is***** will be glad to help. Check that the check engine light is cycling with the key meaning it is communicating and has power and ground. If ok verify all your engine and ECM grounds are good. Another common problem of a crank no start are your TRS and SRS sensors at the front timing cover. The ECM is not seeing engine speed signal therefor injection is disabled. Check for tach response cranking over. Let me know

Customer: replied 1 year ago.

tach is not moving while cranking engine cel is flashing one code is 42 srs no signal this is the sensor's and harness off the old engine

Expert:  Daniel Wilson replied 1 year ago.

That will cause your problem. You arent getting engine speed signal

Expert:  Daniel Wilson replied 1 year ago.

Check the sensors and harness. Possible bad sensor

Expert:  Daniel Wilson replied 1 year ago.

Or the sensor is not picking up the gear for a reading

Customer: replied 1 year ago.
OK I'll check it in the morning and git back to you
Expert:  Daniel Wilson replied 1 year ago.

Sounds good. Pleasure to help

Customer: replied 1 year ago.

how do I check voltage to sensors