Tuesday, January 23, 2007

Battery light is on and alternator not working on 1997 Odyssey Honda with 2.2L engine: No codes


My wife's 1997 Honda Odyssey battery light is on all the time and the alternator won't charge. I replaced the alternator with a rebuilt one from our local parts store but the problem is still there. A friend mechanic told me to replace the ecm (computer) but I am not sure if this will fix the problem. Can you help?

ATS adviser:

There is an electrical load detection (ELD) unit located at the fuse box under the hood. Check the pin wire #2 with grn/red color and see if it is connected to the pin#16 in your ecm. This is a control wire from the ecm to your alternator. To check, run a jumper wire between those pins and if the alternator starts to charge, replace the alternator. Finally, if you bought the alternator locally and not from Honda, I guarantee your alternator will not work.

ATS tip:

When testing the LED unit, make sure the ground wire at pin#1 is clean and secure. To get the wiring diagram for the charging system, contact ATS.


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