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1999 Nissan Pathfinder Questions & Answers
My 1999 Nissan Pathfinder first just shut off on me, and computer said to replace some sort of sensor, then after we fixed that one it would tell us another one to replace, after we replaced every sen
Sorry but you can't rely on fault codes or fault code readers.
If you have a problem it is best practice to initially forget the electronics and begin with the basics - visual and physical checks as if there was no electronics. Verify the presence of fuel and good delivery and the presence of a good spark, etc. etc.
Your car may be old but it is young enough to be fitted with an immobiliser. Immobilisers can be unreliable...
If you get a fault code it is a clue and nothing more. Don't spend money until the sensor, distributor or whatever has been checked and found to be faulty using meters, scanners, live data, oscilloscope...
When you get a fault code, erase it and try again. If at any time test results are inconsistent then remember when a code says a sensor is faulty it often means the sensor and/or the circuit, which could mean wiring, connectors or even the ECU. An ECU is quite capable of telling lies, they aren't bullet-proof and can sustain damage in all sorts of ways but continue to work satisfactorily for a further year or more and then suddenly for no apparent reason begin causing trouble.
No way should you need to replace every sensor or need 3 distributors. It is hard, tedious work checking an entire management system circuit for continuity and the cleanliness of every single connection but if the results of testing are inconsistent the ECU must be suspected and due to the expense, the groundwork must be done before replacement can be justified.
Incorrect gear ratio
most likely the TR sensor that tells the TCM when to change ratios
it also could be a problem VSS that also tells the TCM when it is right to change ratios
run the fault codes
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