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Discussion Starter · #1 · (Edited)
Some of this has been loosely posted before, but I'm not sure that it was in a practical sense. .

Here is a way to get to some useful information using the Instrument Cluster in Diagnostic mode.

1. Hold the button down for trip odometer while turning on the truck, and hold it for 8 seconds, this will put you in diagnostic mode. You will see in the instrument cluster LED read out that things have changed. The display will show "tESt"

Now cycle through the various options - by hitting the "Trip/Reset" button,
it goes though all sorts of crazy cluster tests, like showing you all the LEDs, lights, and other boring static stuff, but keep going you are looking until you see "ot1", now slow down
next comes "ot0"

after "ot0"
you will have 00000 This is your Digital MPH

DIGITAL MPH! ----------------------------------------------------
It reads in hundreths of MPH, so if you are going 58mph it will show 5800

On mine There is a mismatch between the Digital and the Analog,
at 28.5 mph DIgital it shows 30 on the analog, and at 65 mph digital it shows 68 on the analog. I'm not sure which one is more correct.


DIGITAL KPH! --------------------------------------------------
Driving in Canada? Mexico? Use this, One more press from Digital MPH, will show KPH again in hundreths, but totally useable i.e. 70 kph will show 7000


DIGITAL TACH ! ----------------------------------------------
One more press from KPH will show t and then your tachomter speed

FUEL GAUGE ! :frogtongu ---------------------------------------------
Press the key one more time to cycle through F1, and get to F2 your Fuel Gauge.
This is the most interesting one. It shows your Fuel level based on 10 to 254, So 210 = 3/4 tank
140 = roughly half a tank
70 = 1/4 tank

It will flucuate about 7 points due to gas sloshing around, and incline. But on a flat smooth surface it will settle out.

I think this will be a much better way to keep track of low fuel, considering the analog gauge comes on way to early and is sooo vague. Well hopefully, anyways, I'm going to try it out


BATTERY VOLTAGE --------------------------------------
Press once more and you get F5, go past that and the next one will be
batt, which will show your voltage for example 133 = 13.3 volts

To get back to the beginning, you will have to hit the button quite a few more times as it goes through about 20 vague readouts, just keep cycling until you get back to ot0, ot1


The next time you remove your key, the diagnostic mode will disappear.
Also Be sure to pay attention to the ROAD!! Don't get your eyes glued to the display!!!! :thedevil:

ADDED NOTE!! You can exit out DiagnoStic Mode, by holding down the "Trip/Button" for 7-8 seconds, and it will revert to normal. You can't however get back into diagnostic, without turning the truck off and back on.
 

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Interesting if you're a gadget geek, but...why? What info is given that isn't given when in analog mode? I mean..it does seem cool but other than maybe checking to see if an idiot bulb is burned out, what good is it to the layman?
 

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Interesting indeed, I can see playing with this just to see if it is functional and check the accuracy, but not much practical use except setting the display to the fuel mode as I leave for a long trip, since it resets when you shut her down. I think the warning about keeping your eyes on the road is a good one, probably not too smart to be in motion and playing with the display...thanks for the post Elbo
 

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Discussion Starter · #4 ·
HudsonValleyTitan said:
Interesting if you're a gadget geek, but...why? What info is given that isn't given when in analog mode? I mean..it does seem cool but other than maybe checking to see if an idiot bulb is burned out, what good is it to the layman?
Well mostly just a gadget thing.

But the Digital Fuel Gauge should provide a lot more accuracy! Over the Analog!
The Empty Light comes on way to early on most Titans. THE ANALOG IS UBER VAGUE!

The Digital Speedo May be more accurate than the Analog

KPH, If you happen to be driving across the border.
 

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Oh man! Gadgets!! I will try this tonight!
 

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Discussion Starter · #7 ·
For all you tech geeks, here is a break down of all the different entries in diagnostic mode. There is a oil pressure, entry, but unfortunately the output is in Hex, so that's not very natural too look at..


COMBINATION METER SELF-DIAGNOSIS MODE FUNCTIONS
Self-Diagnosis Mode functions Table

-------------------------------
DISPLAY: nrXXXX
Displays hex ROM rev as
stored in NVM.


-------------------------------
DISPLAY: GAGE
Performs sweep of all
gauges, then displays
present gauge values.
Performs checksum tests
on ROM and EE.
Gauges sweep within 10 seconds


-------------------------------
DISPLAY:(All segments illuminated)
Lights all odometer/trip
meter, fuel, and engine
temperature display segments.
Initiating self-diagnosis mode
complete


-------------------------------
DISPLAY: bulb
Illuminates all micro-controlled
lamps/LEDs
regardless of SW configuration.


-------------------------------
DISPLAY:EE XX, FAIL



-------------------------------
DISPLAY:Sc1XX
Displays 8-bit software
configuration value in Hex
format.
Bit Coding
7-3 = reserved for future use
2 = TCS/VDC 0 = not present
1 = present
1 = Shift type 0 = Column shift
1 = Floor shift
0 = ICC 0 = not present
1 = present

-------------------------------
DISPLAY:Sc2XX
Displays 8-bit software
configuration value in Hex
format.
Bit coding
7-0 = Reserved for future use

-------------------------------
DISPLAY:EprXX
Displays 8-bit software
configuration value in Hex
format.
Bit Coding
7-2 = reserved for future use
1 = A/T Oil Temp (gauge)
0 = not present
1 = present
1 = Odo Units 0 = kilometers
1 = miles

-------------------------------
DISPLAY:1nFXX
Displays 8-bit market info
value in Hex format.
$31 = USA
$2A = Canada

-------------------------------
DISPLAY:cYLXX
Displays 8-bit engine configuration
value in Hex
format.
$08 = 8 cylinder
$06 = 6 cylinder

-------------------------------
DISPLAY:FFXXXX
Displays 16-bit fuel flow
constant "Q" in tenths of
cc/min in Hex format.
$0000 - $FFFF

-------------------------------
DISPLAY:tF
Displays 16-bit tire factor
"A" in hundredths in Hex
format.
$0000 - $FFFF

-------------------------------
DISPLAY:eek:t1XX
Displays oil pressure telltale
"on" threshold in A/D
counts in Hex format.
$00 - $FF

-------------------------------
DISPLAY:eek:t0XX
Displays oil pressure telltale
"off" threshold in A/D
counts in Hex format.
$00 - $FF

-------------------------------
DISPLAY: XXXXX
Raw uncompensated
english speed value in
hundredths of MPH.
Speedometer indicates
present speed.
Will display "-----" if message is
not received. Will display
"99999" if data received is
invalid

-------------------------------
DISPLAY: XXXXX
Raw uncompensated
metric speed value in
hundredths of KPH.
Speedometer indicates
present speed.
Will display "-----" if message is
not received. Will display
"99999" if data received is
invalid

-------------------------------
DISPLAY: tXXXX
Tachometer value in
RPM. Tachometer indicates
present RPM.
Will display "-----" if message is
not received.

-------------------------------
DISPLAY: F1 XXXX
Present ratioed fuel level
A/D input 1 in decimal format.
Fuel gauge indicates
present filtered level.
000-009 = Short circuit
010-254 = Normal range
255 = Open circuit
--- = Missing 5 seconds

-------------------------------
DISPLAY: XXXC
Last temperature gauge
input value in degrees C.
Temperature gauge indicates
present filtered temperature.
Will display "---"C if message is
not received.
Will display "999" if data
received is invalid.



-------------------------------
DISPLAY: BAtXX.X
Estimated present battery
voltage.

-------------------------------
DISPLAY: rES -X
Seat belt buckle switch
LH status.
1= Buckled
0 = Unbuckled

-------------------------------
DISPLAY: PA -XX
Hex value port A.

-------------------------------
DISPLAY: Pb -XX
Hex value port B.

-------------------------------
DISPLAY: PE -XX
Hex value port E.

-------------------------------
DISPLAY: PL -XX
Hex value port L.

-------------------------------
DISPLAY: P6 -XX
Hex value port K.

-------------------------------
DISPLAY: Pn -XX
Hex value port M.

-------------------------------
DISPLAY: PP -XX
Hex value port P.

-------------------------------
DISPLAY: PS -XX
Hex value port S.

-------------------------------
DISPLAY: Pt -XX
Hex value port T.

-------------------------------
DISPLAY: Pu -XX
Hex value port U.

-------------------------------
DISPLAY: P4 -XX
Hex value port V.

-------------------------------
DISPLAY: Puu -XX
Hex value port W.

-------------------------------
DISPLAY: A01XXX
A/D port A/D value (nonratioed).
0-255

-------------------------------
DISPLAY: A02XXX
A/D port A/D value (nonratioed).
0-255

-------------------------------
DISPLAY: A03XXX
A/D port A/D value (nonratioed).
0-255

-------------------------------
DISPLAY: A04XXX
A/D port A/D value (nonratioed).
0-255

-------------------------------
DISPLAY: A05XXX
A/D port A/D value (nonratioed).
0-255

-------------------------------
DISPLAY: A06XXX
A/D port A/D value (nonratioed).
0-255

-------------------------------
DISPLAY: A07XXX
A/D port A/D value (nonratioed).
0-255

-------------------------------
DISPLAY: A08XXX
A/D port A/D value (nonratioed).
0-255

-------------------------------
DISPLAY: A09XXX
A/D port A/D value (nonratioed).
0-255

-------------------------------
DISPLAY: A10XXX
A/D port A/D value (nonratioed).
0-255

-------------------------------
DISPLAY: A11XXX
A/D port A/D value (nonratioed).
0-255

-------------------------------
DISPLAY: A12XXX
A/D port A/D value (nonratioed).
0-255

-------------------------------
DISPLAY: A13XXX
A/D port A/D value (nonratioed).
0-255

-------------------------------
DISPLAY: A14XXX
A/D port A/D value (nonratioed).
0-255

-------------------------------
DISPLAY: A15XXX
A/D port A/D value (nonratioed).
0-255

-------------------------------
DISPLAY: PA0-XX
Hex value representing
state of A/D ports 0-7.

-------------------------------
DISPLAY: PA1-XX
Hex value representing
state of A/D ports 0-7.
Event Odometer Display Description of Test/Data Notes:

-------------------------------
DISPLAY: Thr-XXX
Decimal value of thermistor
A/D reading.
0-255


-------------------------------
DISPLAY: D-HI Meter/LCD Illumination.
Full daytime brightness all
LCD segments active

-------------------------------
DISPLAY: N-HI Meter/LCD Illumination.
Full nighttime brightness all
LCD segments active

-------------------------------
DISPLAY: N-LO Meter/LCD Illumination.
Min. nighttime brightness all
LCD segments active
-------------------------------
DISPLAY: GAGE
Return to beginning of selfdiagnosis.
Hex EE level. If EE
checksum fault exists,
display alternates
between "EE XX" and
"FAIL".

-------------------------------
DISPLAY: dtXXXX
Hex coding of final manufacturing
test date.
 

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I am a big nerd! Thanks for this cool trick to get into the diag mode. Now the hex makes sense with this guide.

Admin should sticky this!!!!!
 

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That rocks!! I can see my wife now when we get inthe truck.

:honey, what are you doing?"

"nothing dear just setting up my digital speedo" LOL

Great info. I'm going to try it out!!
 

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Oh sure rub it in for us poor boys that dont have the readout! :crying:
 

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Very Cool

but have you thought og buying a Scan Gauge II. It reads and displays all these functions and more. The fuel gauge, once it learns your truck, is very accurate and can be displayed in miles, hours, or gallons used/remaining.

It covers all the engine sensors too.

It displays metric or imperial units and you can set your speed excactly by running a measured mile. Helpful for non-OEM tire sizes.

It is plug n play into your ODwhateverII jack under the dash. It uses Cat5 cable now so the wire can be cut and routed anywhere and crimping on a new connector. Crimpers are around for $10.00.
 

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TitanRider said:
Do those numbers represent weight, gallons or...?
Thats what I mean, not the number for amount of fuel.
Most fuel guage sending units are basically a series of resistors. I'd bet that the 10 and 254 are ohms being read by the computer from the sending unit.

Mitch
 

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When u hit the button a couple times, theres some stuff on the left of the display that ive NEVER seen before, it looks like a digital speedo on the top left and a rear sonar display on the bottem left im thinking theres a way to program that in to that it will show that stuff... that would be sick!
 

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This is what im talking about


 

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I'm going to check this out just to see what the computer says reegarding my fuel level It's pretty much a given that when the gas guage reads 1/2 you really have about 1/3 left.

I get about 200 miles on the first half a tank and about 100 on the second half.
 
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