What is a fault code p1734 - 2001 Jeep Grand Cherokee

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P1764 OBD Trouble Code P1764 the main thing to check is to verify the operation of the VCT solenoid. You're looking for a sticking or stuck VCt solenoid valve caused by contamination. Refer to vehicle specific repair manual to perform component tests for the VCT unit.
P1764 OBD Trouble Code Repair : The sensors receive a 5 volt reference signal from the PCM. As pressure readings change, the sensor varies the voltage and the computer reads that to determine input. In the case of a broken wire, the sensor never sees the voltage and the computer assumes a major fault. So if you get this P1764 code, first check to make sure you're getting a good 5 volt reference signal at the sensor.

P0731: Gear Ratio Error In First Gear
http://www.autocodes.com/p0731_dodge.html

P1734: Gear Control Malfunction
http://www.autocodes.com/p1734.html

P1784: Transmission System First or Reverse Gear Fault Conditions
http://www.autocodes.com/p1784.html

P1790: Lock-Up Clutch Not Engaging
http://www.autocodes.com/p1790.html

code p 1734 refers to AT-gear shift malfunction===causes --transmission fluid ---mechanical fault ---wiring---shift solenoid---B/C---ECM programming---ECM

It's an electrical fault in the transmission's gear switching. A transmission shop will have to diagnose it, following a guideline called a troubleshooting flow chart. It may be a simple fix, even an electrical connection, but they would know where to start and how to get to it. Get an estimate of the repairs and decide what is best.

Problem po420 O2 sensor and catalytic con.,po306 coil #6 problem.

shift sylenoid

P0780 Automatic Transaxle Malfunction (With Automatic ...


























P0780 Automatic Transaxle Malfunction - With Automatic Transmission





Possible Causes


Setting Conditions

• Mechanical problems present in the automatic transmission can cause this code to set. See the note below.



• Refer to the repair instructions in a transmission repair manual or the information in other electronic media to repair this code.

Engine running; vehicle driven at Cruise speed, and the PCM detected a problem in the mechanical operation of the automatic transmission. Note: This trouble code (P0780) sets with along with several TCM related trouble codes.he





Malfunction Indicator Lamp

The Malfunction Indicator Lamp (MIL) alerts the driver that the Powertrain Control Module (PCM) has detected an OBD II emission-related component or system fault. When this type of malfunction occurs, an OBD II Diagnostic Trouble Code (DTC) will be set by the PCM. The MIL is located on the instrument cluster and is labeled CHECK ENGINE, SERVICE ENGINE SOON, or is identified with an ISO standard engine symbol (i.e., a picture of an engine).

Bulb Test

Each time the ignition switch is turned to the "on" position, the MIL indicator is illuminated for about 3 seconds (which is a function of the PCM).

Readiness Codes

To check if the Readiness Codes are set to complete, turn the ignition switch "on", but do not start the engine. The MIL will come "on" for 15-20 seconds. If it then goes "off", the Readiness Codes are set to complete, If it flashes five times, one or more of the Readiness Codes are not set to complete. To set Readiness Codes from incomplete to complete, perform the drive cycle procedure for the appropriate code.

MIL Lamp-On Message

Each time the PCM detects an Emissions related fault, the MIL is illuminated to inform the driver that the vehicle needs to be taken in for service.




COMPONENT MONITOR DRIVE CYCLE INSTRUCTIONS

• Do not turn off the ignition switch during the test procedure.



• All Onboard Diagnostic Monitors are cleared when the battery is disconnected or when the Powertrain Control Module (PCM) is cleared with the Scan Tool.



• This drive cycle can be used to determine if the Readiness code for this Monitor will run and complete, and if the MIL will remain off after the vehicle is driven.



• Operating Ranges: When a range of values is provided, try to operate the vehicle in the middle of the range. For example, if the vehicle speed range calls for 45-55 mph, drive the vehicle as close as possible to 50 mph. If the engine speed should be 1,000-2,000 rpm, try to operate the engine at 1,500 rpm.



• Scan Tool Data: There are certain Parameter Identification (PID) values that must be within range before this Monitor will "run". It can be helpful to pull up those PID items on the Scan Tool so an assistant can view them during testing.



• The Readiness code for this Monitor defaults to "continuous" or "monitoring" because this Monitor runs continuously when the engine is cranking or running.

COMPONENT MONITOR PRETEST CONDITIONS

• MIL is off.



• No Emission related DTC's are present.

TEST PROCEDURE

1. Connect the Scan Tool to the data link connector (DLC). Use the Scan Tool to clear any stored DTC's and to reset the OBD Monitors.



2. Start the engine and allow it to run at idle speed for 15 seconds.



3. Accelerate at part-throttle to 40 mph and maintain that speed for several minutes. Bring the vehicle to a stop, and then allow the engine to idle with the transmission in Drive (in Neutral for M/T) for 15 seconds.



4. Then accelerate at moderate throttle to 50 mph and maintain that speed for 15 seconds. Bring the vehicle to a stop, and then accelerate to 40 mph and maintain that speed for 15 seconds. Bring the vehicle to a stop and allow the engine to idle for 15 seconds. Repeat this step at least 5 times.



5. Check for any Pending codes in the Generic OBD II section of the Scan Tool. If no Pending codes are set, the Component Monitor test is complete. If any Pending codes are set, refer to the appropriate trouble code repair information to make the repair.

They all point to your Transmission Governor and Gears. You will need to take your vechile to a Transmission Shop to diagnose the problem

P0731 Gear I Incorrect ratio

P0734 Gear 4 Incorrect ratio

P1730 Front Speed Sensor - Low Input
P1732 Rear Speed Sensor - Low Input
P1734 Speed Sensor Reference - Low
These are all references to Electronic Stability Control or ABS systems. If there's no problem with wiring, then you could safely assume the speed sensors are bad.