Can a ECU from a 2002 or 2003 crv work for my crv 2004?
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Junior Member
Joined: Aug 2023
Posts: 5
What was the DTC (diagnostic trouble code)??
Sometimes it is a circuit code. Doesn't mean the O2 sensors are bad but something wrong with the wiring.
If it is the wiring then replacing the O2 sensors will not fix the check engine light.
This not to say that the ECU isn't bad. Just would make absolutely sure a new ECU will fix it.
Sometimes it is a circuit code. Doesn't mean the O2 sensors are bad but something wrong with the wiring.
If it is the wiring then replacing the O2 sensors will not fix the check engine light.
This not to say that the ECU isn't bad. Just would make absolutely sure a new ECU will fix it.
I'll make sure I bring up a possible problem with the wiring.
Thanks a lot.
Junior Member
Joined: Sep 2023
Posts: 13
Yes, You need to get the code first.
I also had a problem with O2 sensor (namely primary O2 sensor heating element). The car was driveable, but CEL was lit. So, after many months of troubleshooting, I found that:
1 - replacement O2 sensor was bad (it was new)
2 - PCM (computer) was also bad. How did I know? When I finally fix the problem, I still had code with old PCM, but not with replacement PCM.
3 - bad grounding points (in one junction point) - they were corroded beyond imagination. I had to solder them together.
Tip on troubleshooting wiring: if you check wiring for continuity with multimeter, check it with a test light, too. You'll need simple test light, spare 12V battery (even from electrical scooter). The testing for continuity with test light allows you to check if wiring can handle the current (can pass current). Why is it important? Because wiring could be corroded or some wire strands may be torn. In such a condition? multimeter will show continuity, but it uses 9V and very little current (miliAmperes). The higher current (let's say 2Amps) will not pass along corroded or damaged wires.
I also had a problem with O2 sensor (namely primary O2 sensor heating element). The car was driveable, but CEL was lit. So, after many months of troubleshooting, I found that:
1 - replacement O2 sensor was bad (it was new)
2 - PCM (computer) was also bad. How did I know? When I finally fix the problem, I still had code with old PCM, but not with replacement PCM.
3 - bad grounding points (in one junction point) - they were corroded beyond imagination. I had to solder them together.
Tip on troubleshooting wiring: if you check wiring for continuity with multimeter, check it with a test light, too. You'll need simple test light, spare 12V battery (even from electrical scooter). The testing for continuity with test light allows you to check if wiring can handle the current (can pass current). Why is it important? Because wiring could be corroded or some wire strands may be torn. In such a condition? multimeter will show continuity, but it uses 9V and very little current (miliAmperes). The higher current (let's say 2Amps) will not pass along corroded or damaged wires.
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