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08/03/2005

  Instrument Reset

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Instrument Reset and Diagnostics

Members of the Confidential List have discovered for themselves a very useful little trick using the instrument panel Odometer trip button. Using the List and sharing information about their own experimentation, a complete list of the diagnostic capabilities developed.

It all began one chilly evening late in December 2001. We were operating on a temporary list at the time because of a server problem, and a member, Robert, posted a problem with his instruments reading only half on cold damp days.   Rob agreed that he had the same thing occasionally, and I had also experienced the same phenomena. I posted the Instrument Panel Reset, which is to press the odometer reset button for about 5 seconds, while the engine is running. This puts the instrument panel into self-diagnostic mode during which all the bulbs in the displays light up and the needles rise and fall. 

On New Years Day Pete then posted one stage further. He had noticed when trying his that the instrument panel then goes through a list of inputs by repeatedly pressing the reset button. Some values were self explanatory - others still a mystery.

The List was quiet again on this subject until 30th January 2002, when Edward posted a problem with his 2.3 1998 Scorpio. With our better knowledge today we would have been quicker at coming to a solution, but at the time his experience of climate control computer resetting with low/high voltage errors were a bit more of a puzzle. Of course it turned out that his battery had failed and was easily fixed, but Bill posted the trick of the reset button so that Ed could check his system voltage. This remains a very useful use for the instrument reset. Why fiddle about with a voltage meter when you can check it from the instrument panel?

Fredrik then asked what the more obscure codes meant. He had figured out most of them but others, like rEL1, rEL2 and button remained a mystery for a while longer..

In February Biggles asked again what the more obscure values were, and by this time John B had obviously experimented, because he filled in the missing blank posed by the 'button' value, which gives the value of the button pressed on the trip computer.

Then Tim came up with another gem. He noticed that the engine temperature value was 255 at cold, and that the value fell as the engine temperature increased. Since the engine temperature sensor returned a voltage in inverse proportion to its temperature, he argues that 255 is the cold value, and that a 132 value of a hot engine was not actually a real temperature but a decimal value which is read by the PCM.

Alex Z  gave us the Type for his DOHC2000 16V - 02.

Then Nick mailed me to say he'd looked at his.  He gives us the code for the 2.3L - 03. He ran his cold and warm and checked the readings and noted that the rAE reading changed slightly after a short run - from 23.7 to 23.0.  Could this be average fuel consumption - yes, but for the Range to Empty calculation - see later.

In May Damian filled in the blank for the 12V - 19, while John gave us the code for his 1997 24V Scorpio - 11. Does this mean there was an instrument upgrade at some time?

In June Peter sent in the Type for his TDI, 07.

In March 2004, Alan S gave us the rAE , the calculated consumption figure for the Range to Empty. Thanks Alan.

In September 2004 Chris S contacted us with amended ideas for FLO and PULSES, and at last gave us the answer for LO S and LO C! The LO C is the resistance of the Low Coolant circuit, and LO S that of the Screenwash.  Both sensors have an integral resistor and the normal (closed) state reads approx 20. Further, he states that in January 1997 when Ford deleted the coolant level sensor they shorted the connection, so these models may show LO C S-C (short-circuited)

Finally in October 2004 the last pieces of the jigsaw were slotted in by Pete C. The following is the entire test sequence with the proper responses for the Scorpio Instrument Cluster. Starting with holding the reset button down for 5 seconds, each press of the button starts the next test. If the button is not pressed for 30 seconds then the test sequence is abandoned.

 

From start to finish this process of discovery has taken almost 3 years - but we got there in the end!


1. Type
- Type of Instrument Cluster:

0        4 cylinder petrol, low series, km

1        4 cylinder petrol, low series, mph

2        4 cylinder petrol, high series, km

3        4 cylinder petrol, high series, mph

4        4 cylinder diesel, low series, km

5        4 cylinder diesel, low series, mph

6        4 cylinder diesel, high series, km

7        4 cylinder diesel, high series, mph

8        6 cylinder 24V petrol, low series, km

9        6 cylinder 24V petrol, low series, mph

10      6 cylinder 24V petrol, high series, km

11      6 cylinder 24V petrol, high series, mph

12      6 cylinder diesel, low series, km  (not installed on Scorpio)

13      6 cylinder diesel, low series, mph  (not installed on Scorpio)

14      6 cylinder diesel, high series, km  (not installed on Scorpio)

15      6 cylinder diesel, high series, mph  (not installed on Scorpio)

16      6 cylinder 12V petrol, low series, km

17      6 cylinder 12V petrol, low series, mph

18      6 cylinder 12V petrol, high series, km

19      6 cylinder 12V petrol, high series, mph

 

Check that the instrument panel displays the correct instrument code. An incorrect Type code can mean that the instrument panel has been changed.

2. Speed Vehicle speed sensor. Shows the actual speed of the vehicle in KPH. This should be within +5% of the MPH.
3. Pulses

Shows the input frequency of the engine speed sensor, updated every second. This check allows the engine speed signal coming from the alternator, (12V V6, 2.5 TDi) or the EDIS (all others) to be measured and calibrated. Should show the following numbers at idle:

26 for 4 cylinder DOHC

40 for 6 cylinder 24V

52 for diesel types

200 for 6 cylinder 12V

4. Fuel

Fuel level in approximate litres.

Full should indicate 65 to 69 litres

O-C means open circuit - break in wiring connection with the fuel level sensor

S-C wiring connection short-circuited.

5. En9 t

This checks the engine coolant temperature sensor as a data signal between 20 to 255, disproportionate to temperature (i.e., high temp, low data number)

S-C means sensor is out of normal range.

When the temperature gauge needle is horizontal the display should read between 79 to 129

37              Maximum temperature

57              Bottom of red chaplet

79 to 159  Middle of Normal band

242            Middle of blue chaplet

255            Bottom  

6. rEL 1

Tests that the ROM software release of the microprocessor is in the range of 0-999. This validates the processor function and should be a steady display.

If the number displayed is flashing then all functions of the cluster could be incorrect and the entire cluster must be replaced.

7. rEL 2

Tests that the Non Volatile Memory (NVM) software release level is in the range of 0-255. This validates the NVM and should be a steady display.

If the number displayed is flashing then all functions of the cluster could be incorrect and the entire cluster must be replaced.

NOTE: If the vehicle being tested is a police vehicle, it is normal for rEL 2 to flash.

8. bAtt

This mode checks the IGN voltage to the instrument panel. It does not check the battery connection to the cluster.

If the number displayed is an acceptable voltage then proceed to next test..

9. Air t

Tests the external air temperature sensor and connections. It shows the air temperature directly in Fahrenheit.

O-C is open circuit or less than -40F

S-C is short circuit or greater than 150F.

NOTE: this reading will not be the same as that displayed by the trip computer, the latter being corrected for possible heating of the sensor by the engine.

10. FL0

This mode tests the EECV and connections for fuel flow. The number displayed increments by one for every 10 fuel pulses received by the instrument cluster from the EECV since entering the feature. At 6553 the display will return to zero.

With IGN on and engine off (KOEO) the FLO should read zero (0). Start the engine and the FLO number should increment from 0 to 6553. If it does not it indicates a signal or loom fault. NOTE: starting the engine will abort the test sequence - press the button for 5 seconds again and press the button repeatedly to return to the FL0 test.

11. rAE

Running Average Economy. This figure represents an internal value of the average economy in MPG, from which the Range to Empty is calculated. The figure will be low after periods of extended idle etc and high after part-throttle cruising.

If an acceptable MPG figure is displayed continue to the next check.

If an unacceptable number is displayed this indicates a cluster fault.

12. button This test checks the fuel computer button resistance inputs and loom connections. Each number represents a range value for each single button pressed.

255              No button pressed

208 to 241  MODE only pressed

38 to 56      S only pressed

158 to 185  R only pressed.

If the display shows 255 when any button is pressed a wiring fault is indicated, or the button contacts inside the fuel computer may be dirty and require cleaning.

if the display shows a number less than 38 when any button is pressed this indicates a wiring fault.

13. L0 C

Low coolant sensor. This shows the value of the input, or S-C for a short circuit.

Reading 5-33 are normal readings.

The low coolant warning lamp should turn off after 5 seconds after starting. If this lamp extinguishes after starting then the LO C should show between 5 to 33. If the lamp stays on the value of the LO C should be higher than 33. If otherwise check wiring and sensor operation.

Note - late models where the coolant level sensor was deleted will show S-C

14. L0 S

Low screen-wash fluid sensor. This shows the value of the input, or S-C for a short circuit.

Reading 5-33 are normal readings.

The low washer warning lamp should turn off after 5 seconds after starting. If this lamp extinguishes after starting then the LO C should show between 5 to 33. If the lamp stays on the value of the LO C should be higher than 33. If otherwise check wiring and sensor operation.

Note - late models where the washer level sensor was deleted will show S-C

 

   
   
 

 

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