Has anyone seen the Youtube vid on digital odmeters ? It says if you hold in your trip reset button befor inserting your key and turning it to start you can pull up all kinds of info. A tach reading and digital speed are avaliable along with a lot of other codes. You scroll through the tests using the reset button. It returns to normal after you shut it off and restart.

 

that works on the older digital odometers (93 era).. dunno on the new ones though.

 

It works on the new ones too. There is all kinds of information in there. It will do a gauge sweep (move all pointers full range of motion), bulb prove out (illuminate all the bulbs so you can see if there's a burnt out bulb), and then you get into a bunch of numbers. You can get raw data for the signals that are driving your fuel gauge, speedometer, tachometer, etc. It has the software and hardware part numbers and I think cluster build dates. It also list out any DTC's if there are any.

 

Yep!

It's called the engineering test mode.

Ignition in "OFF" position.
• Message Center Clusters: depress the reset button in the vehicle while turning the ignition switch to the "ON" position.

• Continue to hold down the reset stem/button for 5 seconds until the cluster message center displays "engineering test mode".

• Press/cycle reset stem/button until the message center displays "manufacture" and the date of manufacture (MM-DD-YYYY).

• Keep cycling through to get to mpg/KM, coolant temp, etc.

 

I went through that too. I didnt understand 90% of the numbers and letters given... I understand oil temp, volts, colant temp. But most were weird numbers and letters. Where can i find a break down or a list of what does code mean???

 

Instrument Cluster Self Diagnostic Mode:

1. To enter the instrument cluster self diagnostic mode with the engine off, depress and hold the trip/odometer reset button.
2. Turn the ignition switch to the RUN position and hold until test appears in the display area (within five to eight seconds).
3. Once the test appears release the trip/odometer reset button within three seconds.
4. Depress the trip/odometer reset button once to advance to each stage of the self-test.
5. Turn the ignition to the OFF position to exit the instrument cluster Self-Diagnostic Mode. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics.

Seq...Display.....Description
=======================================
1.....GAGE........Full deflection sweep
2.....all.........Odometer segment check
3.....bulb........Warning light check
4.....r...........ROM level
5.....NR..........ROM level and type
6.....EE..........EE level
7.....DT..........Manufacture date
8.....CF1.........1st byte configuration setting
9.....CF2.........2nd byte configuration setting
10....CF3.........Not used
11....CF4.........Not used
12....CF5.........NVM configuration
13....DTC ####....Cluster diagnostic trouble codes
14....E ####......Speed MPH
15....####........Speed KPH
16....t ####......Tach RPM
17....F ###.......Fuel level ratio
18....FP ###......Fuel level
19....### C.......Coolant temperature degrees Celsius
20....odo ###.....Odometer input
21....tr..........Trip odometer miles
22....Ebd.........ABS EBD status
23....ABS.........ABS TT status
24....bAt ##.#....Charging system voltage
25....HSd.........High voltage shutdown status
26....tnS.........TNS switch input
27....d ###.......Dimming switch input
28....rhS ##......Dimming value
29....iin.........Ignition key-in status
30....HLP.........Headlight switch status
31....door........Door ajar switch status
32....Stbt........Seat belt status
33....FF0G........Front foglight status
34....rF0G........Rear foglight status
35....F0GF........Foglight relay status
36....Prnd........Gear selector display value
37....PaR.........Park interlock solenoid status
38....Cr..........Run/Start sense circuit check
39....AC..........Run/Acc sense circuit check
40....ArbC........Airbag chime status
41....Ch..........Last/current chime source
42....CHE ##......MIL input
43....LCL -X......Low coolant level switch
44....CS XX.......Charging system status
45....thFt........Theft indicator light
46....od..........Overdrive-off status
47....CC..........Not used
48....PA-PD.......Port A-D readings
49....PE0-PE7.....Port E0-E7 readings
50....PF-PH.......Port F-H readings

Some of these may not be available on your truck.

 

Awesome list! Thanks shotgunz!

 

While we are on the subject you can also run a self test on the stock head unit by holding down the 2 and 6 button and using the 2 button to scan through the dtc folders and get all the info. The digital climate control also has a self test feature.

 

Moderators would it be possible to add shotgunz post to the Articles/Specs section?