The car came into my shop with a no start, the crank sensor was bad. Replaced it with a factory part. Now the customer is experiencing a check engine light, and code P0725. There are no performance problems during test drives. Following Aldata chart, they say the TCM is tied into the system. Could you shed some information on this problem. Thank You Chuck Isaac. Isaac Automotive and Maintence
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Re: 2000 Hyundai Sonnata trouble code P0725
Hi Chuck, I'm assuming you changed the crankshaft position sensor that is underneath the timing belt? If so, there is another sensor that is functionally tied to to it. There is a transmission input speed sensor. This sensor is below the bracket holding the shift cable in
place and is much easier to replace. I'm not a Hyundai specific tech so please be aware, I'm guessing :-) I would shotgun the input speed sensor at it if it is not too expensive. I believe that these two sensors work in conjunction to tell the computer if the lock-up is slipping. This may be one of those; "Tag, your it" problems and maybe that ses light was on previously.
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Without knowing make or model Po725 is a Chrysler code for Engine Speed Sensor Circuit
Possible Causes-- Open or shorted CKP sensor circuit condition - Poor CKP sensor electrical connection - Check communication error between the ECM and TCM - Failed CKP SensorWhen is the code detected-The P0725 Codes is triggered when TCM does not receive the engine speed signal from ECM.Chrysler description-The Engine Control Module (ECM) monitors the engine speed through the Crankshaft Position (CKP) sensor with the engine running, and send signal to the Transmission Control Module (TCM
P0335 is your crank sensor, it is either on it's way out or is finished, it is essential that it be replaced or you will be stranded-not too hard to do if you are somewhat handy, part is usually not too expensive either.
OK!... Tell you STRAIGHT UP!.. this is a GUESSING GAME online. Fuel Pump failure 'apparent'?.. Did anyone VERIFY it was the fuel pump? Unless you guys know what you're doing, you need an EXPERT's EYE and BRAIN on this one -- it could be almost anything!.. Does the Check Engine light come ON when this happens? Whenever the "Check Engine" light comes on, there is always a DTC (Diagnostic Trouble Code) stored in the ECM (Engine Control Module). You'll need an OBDII (On-Board-Diagnostics) scanner to retrieve any codes recorded/set in ECM. Once you do this and let us know what, if any codes are set, then we can go from there... otherwise it's a GUESSING GAME! There are too many possible causes which prevent a SPARK (i.e., fuse, ECM, Wiring, ignition failure sensor, bad CKP (crank position sensor), out of time, etc.
crank signal at the power train control module. May have a bad crank sensor, cam sensor, module, or wiring shorted or open. The last code is for a vacuum leak, check the lines to make sure none are disconnected of have holes