Question about 2001 Chrysler PT Cruiser

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01 chrysler pt cruiser with codes p1781 p0734 p0340 p0172 p0700 timing belt broke but was repalced know runs rough wants to die at stops

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  • slang91504 May 12, 2010

    yes it helped



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P1781 Engine Torque Signal Circuit
Code P1781 is OD pressure switch sense circuit and P1782 is 2-4 pressure switch sense circuit.

I recommend performing a visual inspection of all wiring leading to the trans someoind pack located on the side the trans. The solenoid pack looks like a metal box with a connector on top of it close to the radiator side of the trans.

If the wiring appears okay then I recommend dropping the trans pan and make sure no debris is found. If debris is found than the trans will need to be removed and overhauled or replaced depending on the miles. If no debris is found than I recommend replacing the trans solenoid pack and then have a quick learn performed.

P0734 Incorrect 4th Gear Ratio
The DTC's are all transaxle related. There's nothing you can DIY, see your dealer.

P0732-Gear Ratio Error in 2nd
P0733-Gear Ratio Error in 3rd
P0734-Gear Ratio Error in 4th
P1790-Fault Immediately After Shift

Possible causes for P0732, P0733 and P0734 include:
Related DTC's Present
Transmission Solenoid/Pressure Switch Assembly
Internal Transmission
Intermittent Gear Ratio Errors

Possible causes for P1790 include "Fault After Shift".

P0340 Camshaft Position (CMP) Sensor Circuit
A rationality error has been detected for loss of camshaft position sensor.

Possible causes include:
Intermittent Crankshaft Position Sensor Signal
Intermittent Camshaft Position Sensor Signal
CMP Signal Circuit Shorted Ground
CMP Signal Circuit Open
CMP Signal Circuit Shorted To Voltage
CMP Signal Shorted To (K7) 5 Volt Supply Circuit
Sensor Ground Circuit Open
PCM - CMP Signal
Camshaft Position Sensor

Your recent servicing probably has little to do with the issue. Your dealer will be able to narrow down the issue to a specific cause with the aid of a DRB scan tool and diagnostic manual.

P0172 Fuel Trim System Rich Bank 1
Basically this means that an oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC is very similar to P0175, and in fact your vehicle may show both codes at the same time.

You will more than likely not notice any drivability problems, although there may be symptoms such as a misfire.

A code P0172 may mean that one or more of the following has happened:
* The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
* There could be a vacuum leak.
* There could be a fuel pressure or delivery problem

Possible solutions include:
* Inspect all vacuum and PCV hoses, replace if necessary
* Cleanthe MAF sensor. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
* Inspect fuel lines for cracks, leaks, or pinches
* Check the fuel pressure at the fuel rail
* Check the fuel injectors, they may be dirty. Use fuel injector cleaner or get them professionally cleaned/replaced.
* Check for an exhaust leak before the first oxygen sensor (this is unlikely to cause the problem, but it is possible)

P0700 Transmission Control System Malfunction
The code P0700 is described Transmission Control System Malfunction. Basically what that means is that a malfunction has been detected in the transmission and associated components. There is good news and bad news. The good news is it might be covered under warranty. You didn't say if your vehicle is still under warranty, be aware that you may still have warranty coverage on this since your car is just 3 years old. The bad news is that the P0700 code really means that there are transmission-specific codes that you can't access with a regular code reader. There is a part called a TCM - transmission control module that works in a similar way to your PCM. The TCM handles the transmission electrical "stuff" and it stores further transmission codes. If you want to pursue the issue yourself, you'll need to get your hands on a higher end code reader, or take it to the dealer or a transmission shop to get the actual transmission trouble codes read. Personally we recommend you get a shop to read those codes for you. The other codes are communication codes, we recommend you clear those codes after you fix the P0700 code and see if they come back, they could be related to the "main" transmission issue. The other good news is the fix for this may just be a software update that the dealer can do.

Hope this helped.

Posted on May 12, 2010


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