Solved - Speedo Reset, Overheat Reset And Servicing Reset

[Guest saxomike]

Saxo 1124 petrol 2000. May be the same for other models.

 

These are problems that I've had and worked out how to fix ...

 

1 Analogue instrument reset - if all analogue instruments (speedo, tach, fuel gauge)

"lock" in position they can be reset as follows:

 

Find the radio code which will be needed later (!)

Switch off radio and other sundries.

Ignition on but engine not started, disconnect battery.

Switch Ignition Off, reconnect battery. Everything should now work OK.

Reset radio - press radio "on", at code prompt enter code xxxx, wait, radio will come on.

 

2) To reset maintenance to "0":

 

Use the button located bottom left of the instrument binnacle.

Switch off ignition.

Press and hold down this button, switch on ignition.

Hold down the button until =0 is reached then release the

button. Note - it counts down the thousands and =0 is one

further than 0. Switch off ignition.

 

3) If the engine overheats the red temperature light will stay on but

there is no ECU (engine) light on. Whenever the engine is

running the cooling fan will run, it stays on for about 5 minutes.

Even if the ignition is switched on and off, without engine

start, this sequence is run. This cannot be reset by a

sequence of buttons but needs an OBD-II reset. Once the fault is cleared

everything will work OK.

 

The system works as follows: Sensor is NTC (negative temperature coefficient)

thermistor on thermostat housing, approx values of 20 deg C = 2500 ohm,

60 deg C = 500 ohm, 100 deg C = 180 ohm.

 

If sensor is disconnected the ECU will assume that it's faulty,

apparently all manufacturers design this way. The ECU drives

the fan through a relay so if the fan stays on it may be a

stuck relay.

 

Hope this is helpful. Mine is the saxo with a single cooling fan.

 

Mike