Sunday, March 24, 2013

Chrysler sebring : No Spark Problem

No Spark On Chrysler Sebring


Crankshaft Sensor Problems


No Spark troubleshooting:

98 Chrysler sebring 2.5 did a motor swap and after that there is no spark.
Tried  new crank sensor, tried another distributor and pcm still no spark.
Conducting  voltage check shows distributor is not getting voltage to make coil fire.So No Spark From Coil.
Wiring Checked to be OK.
Checked crank sensor 9volt on orange wire and on gray/ blk goes from 0 to 1.3, 3.9 and 4.99 while rotating engine slowly by hand.


Experts Reply For No Spark to Spark Plugs:

Based on description it indicates towards crank sensor problem.


Basic Functioning Of Crankshaft Sensor:

The crank sensor works by creating a 0-5v square wave signal as the tone wheel passes under it. The switch has to be completely and immediately 0-5v and 5-0v for the PCM to see it as a signal. If you're seeing voltages in between this at the switch points then the sensor is bad.


Why Not To Buy Aftermarket Parts:
This is a very common thing to happen with aftermarket sensors, if you look at the signal on the labscope you would see that the voltage is actually rasping up and down rather than a square signal. There may be something else going on also, but the first thing you're going to need to do is replace the crank sensor with a Mopar part, and make sure it's installed correctly. Make sure corrosion in the sensor bore isn't preventing you from pushing the sensor in until the spacer hits the flexplate. If the air gap is too great it will prevent a clean signal.


Another Possibility is Flexplate:


 If the flexplate is damaged then it can cause this.

If the sensors you tried were aftermarket they're all suspect. Checking their signal on a labscope would probably be necessary to prove them bad for sure, but the readings you supplied definitely point to a bad sensor.I  suggest replacing sensor with original part or with high quality mopar part and see if that helps.



ALSO READ THIS:

CHRYSLER SEBRING 2.7L WHERE IS THE CRANKSHAFT SENSOR LOCATED?

QUERIES RELATED TO CAM SENSOR & CRANK SENSOR?

Why engine will crank and not start with camshaft sensor plugged in.But when camshaft sensor is unplugged engine will start and run.


Expert's Reply:


The crank sensor is in the bell housing of the trans.
Now This is how the system works and operates:

Suppose if the computer system does not see the cam sensor it will go into a default mode and let the engine start after it turns over a few times to know where the cam position is. You could have a bad sensor or the reluctor that the cam sensor reads off of may be bad.

The Reason Engine starts And Runs after Cam Sensor Is Unplugged Because ............
The cam sensor you have may not be any good or it is not seeing the reluctor that it reads from.Now when Cam Sensor Is unplug computer system goes into a default mode and will start the engine after it spins over a few times so it knows where top dead center is based on the crank sensor.


HOW TO REMOVE CRANKSHAFT SENSOR:

Disconnect the negative battery cable.
Remove the air cleaner box.
Disconnect the electrical connector from Crankshaft position sensor (Crankshaft Sensor - 2.7L).
Remove bolt.
Remove sensor.


Chrysler Sebring Crank sensor Removal



ALSO READ THIS:

97 Sebring 2.5 v6 have no spark


Experts Reply:

If you are not getting any voltage from the cam sensor then the distributor will need to be replaced.


The distributor receives it's spark from the PCM via the ASD relay as a result of the crankshaft position sensor. It is a relatively common problem for that sensor to fail on these 2.5L V6 motors and cause the problem of No Spark.

I would recommend replacing this sensor and it should take care of your problem. Here is where the sensor is located:

Chrysler 2.7 Distributor



If distributor is replaced and still the same problem then,something is causing  ASD relay to not supply power to the distributor. If both cam and crank sensors are not the problem, either you have a wiring problem, a bad PCM (Powertrain Control Module), or something is causing a cutoff to  power (maybe an alarm kill start).



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