Question about Jeep Grand Cherokee
Hi i have a jeep grand cherokee 2005 with 4.7L engine with a problem the light came out and the scan say p0133 and p0430 i just change, 4 sensors, cat converters, clean the 8 injectors, change the plugs and the light still there what can i do?
push the reset button on the scan tool
all old DTCs are now erased, SOP.
see if they return.
did you forget to reset them?????
then you said the light is still there, so now the scan tool is lost.
the lamp is just a silly lamp. scan it, again
even a silly loose gas cap sets off the lamp. CEL
so ONLY SCANNING AGAIN WORKS>
unless you read the FSM book and read the how long it takes to drive off each corrected DTC error cause, takes for ever on some
that is why there is button there, on the tool to reset them.
why do other wise????
Posted on Nov 07, 2016
Check the codes again! The P0133 is O2 sensor bank 1 and the P0430 is O2 sensor bank 2.
The next step requires the connection to the OBDII port with a graphic scanner. These problems are relatively easy to diagnose with the proper tool. A graphic representation of the Bank 1 O2 sensor will tell in just a few minutes if the upstream O2 is working properly.
The attached link is worth the time to review the operation and diagnosis of your reported problem. With the knowledge of how these sensors and cat work graphically will provide you with the ability to chose the right shop to diagnose whats going on.
The link is a 30 minute tape and will provide the insight. The P0133 is the easiest to diagnose and it is the bank 1 upstream O2 sensor. The wave shape always looks like the attached photo below. The interval between peaks is about 1 second.
The problem with both banks having problems requires a review of the engine operation. Common to both problems is the engine fuel system.
Diagnosing catalyst efficiency code P0420 or P0430
Things to check are as follows:
Check and fix any exhaust leaks
Check for wiring problems (shorted, frayed wires)
Check the frequency and amplitude of the oxygen sensor (advanced)
Check for a deteriorating / contaminated oxygen sensor, replace if necessary
Check for inlet air leaks
Check the MAF sensor for proper operation
Posted on Nov 05, 2016
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Posted on Jan 02, 2017
Its not unusual for the crankshaft sensor to intermittanly fail. The crank sensors are not real expensive and are not extremely hard to change.
The Crankshaft Position Sensor (CKP) is mounted into the engine block above the starter motor. Engine speed and crankshaft position are provided through the crankshaft position sensor. The sensor generates pulses that are the input sent to the powertrain control module (PCM). The PCM interprets the sensor input to determine the crankshaft position. The PCM then uses this position, along with other inputs, to determine injector sequence and ignition timing. The sensor is a Hall effect device combined with an internal magnet. It is also sensitive to steel within a certain distance from it.
Below is a pic of the sensor location.
Posted on Jul 23, 2009
Hi, you have to remove the fuel rail and then remove the electrical connector and then there is a clip that holds the injector to the fuel rail remove that clip and then remove the injector
Posted on Nov 18, 2009
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