2003 Nissan Sentra 2.5 LE Engine QR25DE

Asked by apple64 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

144,795

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?

3,325

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 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 1,812 nationwide Sentra listings starting at $2,195.

Postal Code:

CarGurus Experts

  • #1
    Doran Harney
    Reputation
    3,000
  • #2
    L_R
    Reputation
    2,940
  • #3
    GuruLK5L9
    Reputation
    1,580
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Nissan Altima
22 Great Deals out of 716 listings starting at $1,400
Used Honda Civic
180 Great Deals out of 3,705 listings starting at $1,995
Used Toyota Corolla
108 Great Deals out of 2,035 listings starting at $2,795
Used Honda Accord
40 Great Deals out of 910 listings starting at $1,599
Used Toyota Camry
52 Great Deals out of 985 listings starting at $2,212
Used Hyundai Elantra
163 Great Deals out of 3,544 listings starting at $2,995
Used Nissan Maxima
9 Great Deals out of 144 listings starting at $5,653
Used Mazda MAZDA3
74 Great Deals out of 1,510 listings starting at $2,495
Used Hyundai Sonata
38 Great Deals out of 1,111 listings starting at $3,112
Used Chevrolet Malibu
50 Great Deals out of 1,139 listings starting at $1,295
Used Volkswagen Jetta
82 Great Deals out of 1,896 listings starting at $995

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. Content will be removed if CarGurus becomes aware that it violates our policies.