97 Altima -weird problem - help needed - Nissan Forums : Nissan Forum
 
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Old 01-19-2010, 12:55 PM
Zapages Zapages is offline
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97 Altima -weird problem - help needed

Hi guys,

We have weird problem with our old trusty 97 Altima. The car runs fine and everything. But the problem is with the computer, I think or sensors of the car.

Here's the story. My parents took our 97 Altima to a private certified inspection station. The mechanic reset the computer of the car. Then he tried to read it again, but couldn't because some of the sensors would not read or give the message the O2 senors, CO2 sensor are not ready. Basically the sensor is not ready. So then told us to keep on driving the car. We have done so for the past 6 weeks and have been bringing the car to him to no avail. The results, we get aka the sensor are not ready or test not completed.

The car runs perfectly and all. We have taken it to 2 different mechanics who are certified inspection stations to no avail.

What do you guys think could be wrong with the car. It drives perfectly has no mechanical problems before this.

The werid part is that there is no error codes that are given by the reader thing that the mechanic has. So its really weird.

Thank you in advance.

Last edited by Zapages; 01-19-2010 at 02:07 PM.
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Old 01-19-2010, 01:53 PM
jserrano jserrano is offline
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Sometimes the ECU will not have enough time to perform adequate system diagnostics, because an event happened and there isn't enough drive cycles or correct driving conditions to complete the system tests. In those cases OBDII will show those system as "Not Ready", for example the EVAP system, etc.

There is also the possibility that the scan tool isn't communicating with the ECU. Make sure that this is not your case cause you'll also get a "Not Ready" for multiple systems. This almost sounds to be the case since you had two different stations have similar results. Get a scan tool connected to see if it shows the current RPM or coolant temp. In which case, it would indicate its not an ECU communication issue.



'94 Nissan Altima SE, 5spd. Ultra Red (AJ4).
Erebuni 905, Turboing, Hotshot CAI, UR Pulley, Calum ECU,
HUD & ATC retrofitted, DEPO lamps /w Silverstars, NGK Ignition wires.
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Old 01-19-2010, 02:07 PM
Zapages Zapages is offline
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jserrano, thanks for the reply.

My parents and I have driven the car a good 500 miles after the reset and we get the same problem as it shows not ready for

O2
CO2
EGR or ERG (don't exactly remember what its called exactly)

Yep two different stations checked it with their reader. What could be the problem though if it does not show the current RPM and coolant temp? If it does show the coolant temp and current RPM. What else could be causing the problem. Its just really weird.

Does the car need a new ECU? Could that be the culprit this time around? I am just wondering. Thanks for the reply though.
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Old 01-19-2010, 03:37 PM
jserrano jserrano is offline
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I wouldn't blame the ECU just yet. Lets try to get the EGR and/or O2 system ready. Oh, and BTW, I don't know what that CO2 is all about since there is no such thing. Something is likely getting misinterpreted between you and the testers. Anyway, on to the system readiness test.

First off, you need to start the engine when the coolant temperature has reached about 14F-95F. Next, you have to let the engine idle until it reaches 158F. Let is idle for an additional 2 minutes after reaching 158F. For some reason I'm thinking that the engine is NOT getting warmed up sufficiently. This could be caused by a thermostat problem or the ECU not properly reading the coolant temperature. That is why a reading from a scan tool of the actual coolant temp is very important to know.

Finally, go driving at about 50-55 mph for about 4-5 minutes of so. The engine temperature should not drop below 158F during these tests or you will end up with the systems not being able to complete its driving cycles.

If you don't want to go driving around then lift the front wheels off the ground and do the tests in your driveway. One good thing about this way of testing is that at least you won't have air blowing through the radiator which could be lowering the engine temp, if it was already marginal, and affecting the test.

Good luck and let us know what you've found.



'94 Nissan Altima SE, 5spd. Ultra Red (AJ4).
Erebuni 905, Turboing, Hotshot CAI, UR Pulley, Calum ECU,
HUD & ATC retrofitted, DEPO lamps /w Silverstars, NGK Ignition wires.
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Last edited by jserrano; 01-20-2010 at 01:56 PM.
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Old 01-19-2010, 11:25 PM
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Quote:
Originally Posted by Zapages View Post
We have weird problem with our old trusty 97 Altima. The car runs fine and everything.
...
The car runs perfectly and all. We have taken it to 2 different mechanics who are certified inspection stations to no avail.

What do you guys think could be wrong with the car. It drives perfectly has no mechanical problems before this.
You asked the question, here's my take:
there is nothing wrong with your car. It runs great, take your own word for it.

If a warning light glows and it bothers you, well, that's what black electricians tape is made for.
drive it until you notice a performance decline, then decide whether it's serious enough to get concerned about.
Fair enough chance it'll run nearly forever.

1997 Altima, 5-speed;
144,000 miles.
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Old 01-20-2010, 02:00 PM
jserrano jserrano is offline
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^ I think you missed the point. He's not complaining the car's performance. His complaint is about an issue with emissions testing.



'94 Nissan Altima SE, 5spd. Ultra Red (AJ4).
Erebuni 905, Turboing, Hotshot CAI, UR Pulley, Calum ECU,
HUD & ATC retrofitted, DEPO lamps /w Silverstars, NGK Ignition wires.
ITEMS FOR SALE
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