Engh Motors - GMTDScan Tech

Frequently Asked Questions

Here is a collection of the most frequently asked questions about GMTDScan Tech. Click a question to view our answer.

- What is the current version of GMTDScan Tech?

The latest version of GTMDScan Tech is v1.2.0.0
It was released November 3, 2008.

The answer is, you don't. After purchase you will get the GMTDScan Tech setup files e-mailed to you in a compressed zip file package, along with a software license. Downloads of application upgrades are handled from within the GTMDScan Tech software itself.

- What steps do I need to take to set TDCO?

Start GMTDScan Tech.
Connect to your truck.
Go into the dashboard view and verify that the engine coolant temp is at, or above, 180 °F. If not, wait before proceeding.
Go into the DTC view and verify that no trouble codes are present.
Go into the TDC view.
Take note of the current DES/ACT/TDCO values. OEM is +3.5°/+3.5°/-0.5°.
Click the TDC Time Set ON button. DES should now read 0° and ACT should read +3.5° on average.
Click the TDC Time Set OFF button to go back to normal operating mode.
Click the TDC Learn ON button. The TDCO value will now fluctuate for about 20-30 seconds before setting itself. You can end the sequense prematurely by clicking the TDC Learn OFF button. The current TDCO value will then be set in the PCM.
If you are not happy with the TDCO you get you must turn the injection pump. Towards the drivers side is "+" and towards the passenger side is "-". A 2mm move equals 5° so take it very easy and do not attempt to turn the injection pump while the engine is running!
Repeat the TDC Learn procedure until the TDCO you want is attained.

Note:
You need to know what you are doing when attempting this procedure. If your mechanical skills are limited, leave it up to a skilled friend or professional to do it for you. You are on your own if something breaks. Engh Motors cannot be held responsible for damages, injuries or costs of any kind.

- I keep getting "INVALID LICENSE FILE!". What is wrong?

You have not entered your licensing information correctly. All info needs to be entered exactly as it appears in the delivery e-mail, not just the license key. Get a single character wrong and validation will fail. It is even case sensitive. Copy and paste all information to avoid typing mistakes.

- What about GMTDScan Tech updates, do they cost extra?

No, updates does not cost extra. Minor version upgrades (1.x) are included in the price. If a major version (2.x) is released you will be given the option to purchase a license upgrade at a heavily discounted price. Downloading of upgrades are handled from within the GTMDScan Tech software itself.