2003 Nissan Sentra 2.5 LE Engine QR25DE

Asked by Oct 07, 2014 at 04:54 PM about the 2003 Nissan Sentra 2.5 LE

Question type: Maintenance & Repair

Can you test ECM when car is not running?  How do you disconnect ECM from wire harness?

5 Answers

68,365

Yes it can be checked,not running,and why would you want to take it out,unless you are replacing it?

If we need to replace it, we want to do it ourselves, not pay a garage. How do you test it?

68,365

It will need scanning,

1,535

You will need to go to the shop anyway, unless you know what you're doing. Maybe we can help you here if we know what problem you're trying to solve.

1 of 1 people found this helpful.

About a month ago the service engine light came on for a couple of days and then went off. We put it on the hand held coder and it read # 4 cylinder. we replaced the spark plug and it went off again for a couple of days. Then back on again. We changed the coil pack and it went off again and then back on. Still reading #4 cylinder on coder. then we seen antifreeze in the oil so stopped driving it and started to tare it down to replace head gasket. When we had it all back together it wouldn't start. we have put on a new cam and crack sensor. We have check the wire harness. The 3 wires running from the ECM to the coil packs. they are not broken. Got one new coil to see if there would be any spark there but there was no spark. When you try to start it the 1st and 2nd time, it will spark a little bit on 2 and 4 cylinder and after that nothing. so we thought the next step would be the ECM.

Your Answer

Sentra

Looking for a Used Sentra in your area?

CarGurus has 49,615 nationwide Sentra listings starting at $2,495.

ZIP:

Nissan Sentra Experts

  • #1
    L_R
    Reputation
    1,370
  • #2
    Doran Harney
    Reputation
    1,310
  • #3
    Tom Demyan
    Reputation
    1,060
View All

Related Models For Sale

Used Nissan Altima
940 Great Deals out of 74,801 listings starting at $1,300
Used Toyota Corolla
870 Great Deals out of 56,212 listings starting at $1,488
Used Honda Civic
773 Great Deals out of 72,595 listings starting at $1,400
Used Toyota Camry
1,032 Great Deals out of 72,978 listings starting at $295
Used Honda Accord
1,062 Great Deals out of 61,093 listings starting at $1,099
Used Hyundai Elantra
489 Great Deals out of 42,528 listings starting at $2,295
Used Nissan Maxima
276 Great Deals out of 23,143 listings starting at $799
Used Ford Focus
740 Great Deals out of 52,665 listings starting at $999
Used Hyundai Sonata
674 Great Deals out of 49,681 listings starting at $500
Used Mazda MAZDA3
335 Great Deals out of 26,511 listings starting at $950
Used Volkswagen Jetta
569 Great Deals out of 35,667 listings starting at $1,000

Used Cars For Sale

2017 Nissan Sentra For Sale
26 Great Deals out of 33,302 listings starting at $10,723
2016 Nissan Sentra For Sale
88 Great Deals out of 3,105 listings starting at $8,991
2015 Nissan Sentra For Sale
99 Great Deals out of 3,209 listings starting at $6,995
2014 Nissan Sentra For Sale
182 Great Deals out of 4,123 listings starting at $5,995
2013 Nissan Sentra For Sale
52 Great Deals out of 1,635 listings starting at $3,991

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.