WJdiag Pro - Diagnostics for J

JeepsWJ

About this app

WJdiag Pro is made for diagnosing issues of Jeep Grand Cherokee 2002-2004 year, WJ/WG models with 2.7 CRD engine.
WJdiag is working with Bluetooth ELM327 device through OBD2.

Supported functions of WJdiag Pro are listed on our website tutorial page at https://jeepswj.com/wjdiag-tutorial

We highly recommend to use good ELM327 and avoid fake Chinese devices.
Most of 10 EUR Chinese ELM327 devices do not support ISO 9141-2 and J1850 data protocols that are needed for Jeep WJ diagnostic and will display connection error even if some other generic diagnostic app can connect to some module.
WJdiag is customized app for Jeep WJ/WG, it can not connect with your car if your ELM327 can not handle data that Jeep needs. There are no problems with good ELM327 devices and they can connect to car correctly. Your ELM327 compatibility can be checked with WJdiag Free.

WJdiag has all options of professional car diagnostic - Fault Codes, Sensor Live Data, Tests and Coding. All electronic modules that 2.7 CRD Jeep has are supported. All electronic modules except Engine, Transmission and Shifter are supported on gasoline and 3.1 diesel model.
In addition WJdiag Pro can access to many Chrysler Group cars made between 1998 and 2005.
Electronic modules that WJdiag can access:
Engine (2.7 CRD only),
Transmission (2.7 CRD only),
ABS,
Airbag,
Shifter Lever (2.7 CRD only),
SKIM,
Body Computer,
Automatic Temp control,
Driver Door,
Passenger Door,
Electro Mech Cluster,
Overhead Console,
Navigation System,
Radio,
CD Changer,
Park Assist,
Rain Sensor,
Adjustable Pedal Module,
Satellite Audio Receiver,
Hands Free.

Engine support for 2.7 CRD models:
Fault codes reading with ID code and code explanation, Freeze Frame.
Fault codes clearing
Live Data (51 values, it is every value that 2.7 CRD engine has). Logging with options
Input / Output (26 values - switches, EGR, relays, Steering Wheel etc.)
Injector Test and Coding

Transmission support for 2.7 CRD models:
Fault codes reading with ID code and code explanation, Freeze Frame
Fault codes clearing
Live Data (22 values), Logging with options.
Input / Output (23 values - solenoids, gears, Shifter signals, Transfer Case switch etc.)

ABS support, all WJ/WG models:
Fault codes reading and clearing
Live Data, Logging with options
Input/Output values
Pinion Factor coding (Speedometer correction)

Other control units randomly have Fault Codes, Live Data, Input/Output and tests.
Before you buy our WJdiag Pro application, please try our WJdiag Free to confirm that your ELM327 diagnostic device can read data from your car.

Ratings and reviews

Worth it! I have a US 2002 4.7L WJ, it cannot communicate with the engine or transmission computers, but DOES work for everything else, such as abs and airbags. it can even calibrate your speedometer for tire size! the cost of the app is a lot less than the money I was going to spend on parts I didn't need. There are lots of other options for engine and transmission apps, this one handles everything else. JScan doesn't support WJ so this is the best option!

If you have a WJ 2.7 you NEED this app. Only runs on android which is a bit of a pain being an Apple user, but you can get cheap android devices/phones to run it. After five years of pulling my hair out at not being able to diagnose issues, beyond doing the "old three key dash routine" (which tells you very little). And very few workshops (in Australia at least) have software to diagnose 2.7's. Get it! You won't regret it. Faults, live data across every key function you are likely to need. And great support.

I was able to recalibrate my speedometer on a 2003 Jeep Grand Cherokee Overland WJ. That's worth the cost of the app right there!