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WJdiag Pro - Diagnostics for Jeep Grand Cherokee Screenshot 0
WJdiag Pro - Diagnostics for Jeep Grand Cherokee Screenshot 1
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About WJdiag Pro - Diagnostics for Jeep Grand Cherokee

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.

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Frequently Asked Questions(FAQ)

What is WJdiag Pro?

WJdiag Pro is a diagnostic tool specifically made for diagnosing issues of Jeep Grand Cherokee 2002-2004 year, WJ/WG models with 2.7 CRD engine.

How does WJdiag Pro work?

WJdiag Pro works with a Bluetooth ELM327 device through OBD2.

Where can I find the supported functions of WJdiag Pro?

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

Can I use any ELM327 device with WJdiag Pro?

We highly recommend using a good ELM327 device and avoiding fake Chinese devices. Most of the 10 EUR Chinese ELM327 devices do not support the required data protocols for Jeep WJ diagnostic and may display a connection error. Your ELM327 compatibility can be checked with WJdiag Free.

Which electronic modules are supported by WJdiag Pro?

WJdiag Pro supports all electronic modules that 2.7 CRD Jeep has, except for Engine, Transmission, and Shifter on gasoline and 3.1 diesel models. It can also access many Chrysler Group cars made between 1998 and 2005. The supported electronic modules include Engine, Transmission, ABS, Airbag, Shifter Lever, 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, and Hands Free.

What engine support does WJdiag Pro have for 2.7 CRD models?

For 2.7 CRD models, WJdiag Pro supports fault codes reading with ID code and code explanation, freeze frame, fault codes clearing, live data (51 values), logging with options, input/output (26 values), injector test, and coding.

What transmission support does WJdiag Pro have for 2.7 CRD models?

For 2.7 CRD models, WJdiag Pro supports fault codes reading with ID code and code explanation, freeze frame, fault codes clearing, live data (22 values), logging with options, and input/output (23 values).

What ABS support does WJdiag Pro have for WJ/WG models?

WJdiag Pro supports fault codes reading and clearing, live data, logging with options, input/output values, and pinion factor coding (speedometer correction) for ABS in all WJ/WG models.

What other control units are supported by WJdiag Pro?

Other control units randomly have fault codes, live data, input/output, and tests.
author
Great app, helped me a lot.
Mateusz Dębski
author
Very good app, works excellent. Do make sure to buy a real ELM device, it saves a lot of headache (and money, on the long run).
Márton Szabó
author
Wery usefull for diesel wj jeep owners
adammoga80
author
Fantastic App! Thank you so much for creating it 👍🏼
Luke Iveson
author
Nice app, please make it work for xj 2.5td please!
Cristian John
author
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 n...
nudibanches