DTC P1810 – Why it comes up and how to fix it?

Recently my friend took complete motor and transmission from an old car to his Chevrolet Impala as the harness and PCM on his Impala was damaged. Then he got 2 P1810 codes. He tried to clear the codes with GM Tech2 diagnostic scanner but the codes returned after 2-3 engine starts, or after sitting for while. Then he came to me for help.

DTC P1810 indicates to (Transmission Fluid Pressure) TFP Valve Switch Malfunction, which means there could be problems related to TFP valve switch. To find out the issue, let us have a look at the TFP valve switch circuit and PCM description:
The automatic transmission fluid pressure (TFP) manual valve position switch consists of five pressure switches (two normally-closed and three normally-open) and a transmission fluid temperature (TFT) sensor combined into one unit. The combined unit mounts on the valve body.
The powertrain control module (PCM) supplies ignition voltage for each range signal. By grounding one or more of the circuits through various combinations of the pressure switches, the PCM detects which manual valve position you select. The PCM compares the actual voltage combination of the switches to a TFP manual valve position switch combination table stored in memory.
The TFP manual valve position switch cannot distinguish between PARK and NEUTRAL because the monitored valve body pressures are identical. With the engine OFF and the ignition switch in the RUN position, the TFP manual valve position switch indicates PARK or NEUTRAL. Disconnecting the AT inline 20-way connector removes the ground potential for the three range signals to the PCM. In this case, with the engine OFF, and the ignition switch in the RUN position, D2 will be indicated.
When the PCM detects an invalid state of the TFP manual valve position switch circuit by deciphering the TFP manual valve position switch inputs, then DTC P1810 sets. DTC P1810 is a type B DTC.
The P1810 error code usually comes up in several situations:
No VSS assembly DTCs P0502 or P0503.
The system voltage is 8-18 volts.
The engine speed is greater than 450 RPM for 5 seconds.
The engine is not in fuel cutoff.
The engine torque is 50-450 lb ft.
The engine vacuum is 0-105 kPa.
Now let us go down to business and find out how to fix the P1810 problem.
First of all, per0form Powertrain Diagnostic System check.
Then go to a Powertrain On Board Diagnostic (OBD) System Check in Engine Controls.
Check transmission fluid level.
Take out GM Tech2 scanner.
Turn ON the car ignition, with the engine OFF.
Record the DTC Freeze Frame and Failure Records.
Clear the DTC. Before clearing the DTC, use the obd2 tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the PCM.
Start the engine and idle at normal operating temperature.
Apply the brake pedal.
Select each transmission range: P, R, N, D4, D3, D2 and D1.
Does each selected transmission range match the Scan Tool TFP Sw.
Go to Diagnostic Aids
Turn OFF the ignition.
Disconnect the AT inline 20-way connector (additional DTCs may set).
Turn ON the ignition, with the engine OFF.
Does the Scan Tool TFP Sw. A/B/C parameter indicates HI for all range signal states?
Turn OFF the ignition.
Install the J 44152 jumper harness (20 pins) on the engine side of the AT inline 20-way connector.
Turn ON the ignition, with the engine OFF.
Using the J 39200 digital multimeter (DMM) and the J 35616-A connector test adapter kit, measure the voltage from terminal N of the J 44152 to ground. Refer to Automatic Transmission Inline Harness Connector End View.
Measure the voltage from terminal R of the J 44152 to ground.
Measure the voltage from terminal P of the J 44152 to ground.
Connect a fused jumper wire from terminal N of the J 44152 (signal circuit A) to ground while monitoring the Scan Tool TFP Sw. A/B/C parameter. When signal circuit A (CKT 1224) is grounded, do any other signal circuits indicate LOW?
Connect a fused jumper wire from terminal R of the J 44152 (signal circuit B) to ground while monitoring the Scan Tool TFP Sw. A/B/C parameter. When signal circuit B (CKT 1225) is grounded, do any other signal circuits indicate LOW?
Connect a fused jumper wire from terminal P of the J 44152 (signal circuit C) to ground while monitoring the Scan Tool TFP Sw. A/B/C parameter. When signal circuit C (CKT 1226) is grounded, do any other signal circuits indicate LOW?
Test the signal circuits (CKTs 1224, 1225 and 1226) of the TFP manual valve position switch that did not indicate HI for a short to ground between the PCM connector C1 and C2 and the AT inline 20-way connector. Refer to Circuit Testing and Wiring Repairs in Wiring Repairs. Did you find and correct the condition?
Test the signal circuits (CKTs 1224, 1225 and 1226) of the TFP manual valve position switch that did not indicate ignition voltage for an open between the PCM connector C1 and C2 and the AT inline 20-way connector. Refer to Circuit Testing and Wiring Repairs in Wiring Repairs. Did you find and correct the condition?
Test the affected signal circuits of the TFP manual valve position switch for a shorted together condition between the PCM connector C1 and C2 and the AT inline 20-way connector. Refer to Circuit Testing and Wiring Repairs in Wiring Repairs. Did you find and correct the condition?
Test the signal circuits (CKTs 1224, 1225 and 1226) of the TFP manual valve position switch for an open or shorted condition between the TFP manual valve position switch and the AT inline 20-way connector. Refer to Circuit Testing and Wiring Repairs in Wiring Repairs. Did you find a condition? Replace the AT wiring harness assembly. Refer to Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness. Did you complete the replacement?
Replace the TFP manual valve position switch. Refer to Valve Body and Pressure Switch
Replace the PCM. Refer to PCM Replacement/Programming in Engine Controls. Did you complete the replacement?
Perform the following procedure in order to verify the repair:
Select DTC.
Select Clear Info.
Operate the vehicle under the following conditions:
A. Turn ON the ignition, with the engine OFF for at least 2 seconds.
B. Start the vehicle and idle for 5 seconds.
C. Drive in D4 until the TCC locks for 10 seconds.
D. Continue to run the engine for at least 60 seconds from startup.

Which FVDI ABRITES Commander to select? How?

Are you interested in FVDI ABRITES Commander? If you do, you should pay attention to this article. Here I am showing you which FVDI ABRITES Commander to select and how to select.
You might be confused with so many FVDI commanders or maybe called various versions. Why there are with so many versions? Why should pay attention to buy them? For they are all pricy and people want to buy should take an overall consideration.
You should know that this obd2 tool is totally with 18 diagnostic software. Of course, the simplest basis on choosing it is just according to its compatible vehicle modes. You could have options from the compatible vehicles to select one or two fitting for your demands.

Generally speaking, FVDI ABRITES Commander with 18 software (containing two will be released later) is a good choice for professional mechanics.
If you want to do Volkswagen, Audi, Skoda and Seat, you could select the ABRITES compatible with Freely Volkswagen, Audi, Skoda and Seat Get: Hyundai, Kia + Tag Software + VVDI Immo Plus V13.6 and for Volkswagen, Audi, Skoda, and Seat.
As to this version or software, you could enjoy the newest version v21.0 for VAG vehicle models, which is available with multiple languages, including English, Germany, and Spanish and so on. It is window based auto diagnostic tools and work with car models via OBDII port.
Actually, which FVDI ABRITES Commander to select? How? It just depends on your demands.
Software for Mercedes-Benz, SMART, Maybach; for BMW, MINI; for OPEL, VAUXHALL; for Peugeot, Citroen; for Fiat, Alfa, Lancia; for Renault; for Porsche; for Nissan, Infiniti; for Toyota / Lexus; for Tag without fvdi & avdi host; for Tag with fvdi & avdi host; for Volvo; for FORD, MAZDA, JAGUAR, LAND ROVER, MERCURY, LINCOLN: Ford, Mazda, Jaguar, Land Rover, Mercury, Lincoln; for Chrysler, Dodge and Jeep and for Mitsubishi, can be totally accessed to. It is just depending on your garages customers groups.
Vehicles technology is constantly developed and so does vehicle diagnostic tools. Before, this FVDI ABRITES Commander is totally with 16 software, and in near future, two more will be released and they are FVDI ABRITES Commander for DAF; for Bike, Snowmobiles and Water scooter

Suited car diagnostic tools for Asian motor vehicle products

No issue where you operate, as an automotive mechanic, you might get the job done with Asian automobile versions. Therefore, an experienced car diagnostic tool with wide-coverage of Asian vehicle styles is poorly desired in improving do the job efficiency and fixing accuracy. Today are introducing you several of them.

Because there are many highly effective and practical auto diagnostic tools, listed here I am just listing four of them to possess a comprehensive description. They can be respectively VDM UCANDAS, X431 collection this sort of as diagun3 or IV, DS708 and Autoboss v30. I rank them by their selling prices, from low to substantial. In this article you could potentially get a reference.
VDM UCANDAS
This is really an obd2 diagnostic resource with multi-language for over forty seven motor vehicle makes, like Asia car or truck styles, Audi, Benz, BMW, Citroen, Fiat, Ford EU, Jaguar, Lancia, LandRover, MINI, Opel, Peugeot, Porsche, Renault, Saab, Seat, Skoda, Wise, Vauxhall, Volvo, VW.
It supports speedy procedure with WIFI and USB connection, and is particularly suitable with new laptop units, these types of as Windows XP, 7 and 8. Besides, it supports full system and with several features, you may have much more particulars (four equipment described in this article) on chinasinoy.net.
X431 series this kind of as diagun3 or IV
Launch X431 diagnostic instrument is often a number of expert motor vehicle diagnostic resources, highlighted with portability, entire capabilities and adaptability to utilize. Generally, this series also showcased with supporting multiple languages and masking assortment of vehicle types including Asian car styles.
Here consider diagun3 one example is.diagun3 is characterised with useful diagnostic capabilities, diagnose via wifi functionality, well known and built-in design, far better battery program, effortless function compared and assessment and showing two data stream in on display screen.
DS708
A qualified software like DS708 cannot be skipped by technicians, for it don't just addresses European and American car or truck models, and also that of Asian. certainly, it can be with quite a few effective capabilities and options which enable it to be the favourite device among mechanics.
Autoboss v30
This is super scanner with English, Spanish and Russian offered. Autoboss v30 also a resource supports full car or truck modules, these as travel line, system etc. its functions contain details and graphing, coding, net update, screening etc, dealing with exceeding fifty seven tends to make.