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

66,465

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?

66,465

It will need scanning,

1,475

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

Add photo

Related Questions

Sentra

Looking for a Used Sentra in your area?

CarGurus has 52,500 nationwide Sentra listings starting at $1,000.

ZIP:

Search Nissan Sentra Questions

Nissan Sentra Experts

#1 L_R
L_R
Reputation 1,310
#2 Doran Harney
Doran Harney
Reputation 1,290
#3 Tom Demyan
Tom Demyan
Reputation 1,040
View All

Related Models For Sale

Used Nissan Altima
1,290 Great Deals out of 75,736 listings starting at $1,695
Used Toyota Corolla
975 Great Deals out of 69,758 listings starting at $2,000
Used Honda Civic
868 Great Deals out of 85,333 listings starting at $500
Used Honda Accord
1,046 Great Deals out of 68,867 listings starting at $1,000
Used Toyota Camry
1,219 Great Deals out of 84,969 listings starting at $750
Used Nissan Maxima
328 Great Deals out of 24,436 listings starting at $1,995
Used Hyundai Elantra
647 Great Deals out of 41,474 listings starting at $900
Used Ford Focus
793 Great Deals out of 55,063 listings starting at $1,200
Used Mazda MAZDA3
402 Great Deals out of 29,726 listings starting at $1,495
Used Hyundai Sonata
866 Great Deals out of 48,082 listings starting at $1,495
Used Volkswagen Jetta
559 Great Deals out of 44,282 listings starting at $800

Used Cars For Sale

2017 Nissan Sentra For Sale
11 Great Deals out of 34,663 listings starting at $10,999
2016 Nissan Sentra For Sale
104 Great Deals out of 3,399 listings starting at $8,988
2015 Nissan Sentra For Sale
126 Great Deals out of 3,733 listings starting at $7,495
2014 Nissan Sentra For Sale
198 Great Deals out of 4,273 listings starting at $5,890
2013 Nissan Sentra For Sale
69 Great Deals out of 1,901 listings starting at $5,500

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.