Why does my truck engine not start when I replace the ECM?
NOTE: A new ECM comes with an unprogrammed Personality Module in it. If the ECM has been replaced, the ECM WILL NOT COMMUNICATE and the ENGINE WILL NOT START until the integral Personality Module has had software flashed into it. 4.
What to do if your 3126 won’t start?
Not at all too techie! After trying everything I could think of or find elsewhere on the web, disconnecting the IAP allowed the 3126 to start immediately, but run just a little ragged. Reconnecting the IAP afterwards, while running, the engine smoothed out and continued to operate normally.
Why does cat 3126 B won’t start?
Really need to check the HEUI oil pressure while cranking, if it has an internal oil leak or a worn HEUI pump it wont get enough oil pressure to fire the injectors when cranking. rpsunrise Thanks this. I ran the codes as Jas suggested and came up with 87 and 34 in that order.
How do you replace an ECM in a GM car?
Install hardware on the replacement unit. Reconnect the electrical connectors, making sure they are clean and firmly seated. Install replacement ECM using the hardware from the original unit. 5. TESTING Connect a scan tool to the diagnostic connector located under the dash on the driver’s side.
What kind of engine does a cat 3126 have?
I have a 3126 in a 2004 Ford that was running fine when I parked it. Tried to start it after is sat for a couple of weeks. The engine cranks like it should but makes no signs of starting.
Is there any warranty on Cat 3126 cranks?
The diagrams I have seen don’t look exactly like my configuration. No warranty! Any thoughts?
What causes a truck engine to not start?
If the ECM has been replaced, the ECM WILL NOT COMMUNICATE and the ENGINE WILL NOT START until the integral Personality Module has had software flashed into it. 4. No Speed/Timing Signal: a.
How can I test my caterpillar ECM wiring?
ECMs are pretty tough. Problems like yours are wiring related 99.99% of the time. Another test you can do is to load test those power and ground wires. With the OEM connector disconnected at the ECM, jump power one at a time from pin 4 and 6, through a headlight bulb, then ground the headlight to make it come it on.