After changing alternator Check engine light is on - JeepForum.com
 
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post #1 of 6 Old 03-23-2019, 03:25 PM Thread Starter
bman21
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After changing alternator Check engine light is on

I Got a 1997 TJ 2.5. 5 speed. I Just changed the alternator because the old one was seized up. After changing the alternator now the check engine light is on and the codes it giving is 37 and 25. Any help I’d really appreciate it. It did not have the CEL on before I began. All the gauges bounce to very irractic. I know this are the code but not sure where to begin and if it has anything to do with changing the alternator. 25** A shorted or open condition detected in one or more of the idle air control motor circuits. Actual idle speed does not equal target idle speed.37** Relationship between engine speed and vehicle speed indicates no torque converter clutch engagement. An open or shorted condition detected in the torque converter part throttle unlock solenoid control circuit. Incorrect input state detected for the Park/Neutral switch. Auto only.

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post #2 of 6 Old 03-23-2019, 03:48 PM
CJ7-Tim
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Is the battery almost or fully charged ?

Confirm all the wire connections are snug, and are connected correctly. Test the alternator output at the alternator and at the battery.

About 10 -15% of cheap crappy rebuilt in China alternators are defective, the ones that come with a "Lifetime Warranty" are the biggest offenders. Did you have the parts store test the alternator before you paid for it ?

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post #3 of 6 Old 03-23-2019, 03:54 PM
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Your problems could be due to low voltage because the new alternator is not charging the battery. Like above, double check your connections. If you still have problems, yes, you may need to get the new one tested. What is your battery voltage, as measured at the battery with a voltmeter?

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post #4 of 6 Old 03-23-2019, 05:07 PM
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I am confused - likely the bourbon,
BUT why do we have 2 digit codes on a OBDII 1997

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #5 of 6 Old 03-24-2019, 08:25 AM
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Quote:
Originally Posted by jtec View Post
I am confused - likely the bourbon,
BUT why do we have 2 digit codes on a OBDII 1997

Key on/off 3x method, flashes out codes on the ipc.

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post #6 of 6 Old 03-24-2019, 05:15 PM Thread Starter
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So after further investigation I took the alternator back off and when doing so I noticed that one of the terminals wasn’t tight and wouldn’t tighten up. So I removed the nut that was behind it and it allowed me to tighten the terminal up where it needed to be. I also cleaned all terminals and charged the battery all the way up just to make sure that wasn’t the problem. Sure enough no check engine light and no codes!! Back to jeepin!
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