Ferrari 360 Slow Down | Aldous Voice

10 Sep 2014 | Author: | Comments Off on Ferrari 360 Slow Down | Aldous Voice
Ferrari 360

Ferrari 360 Slow Down

The 360 is with catalytic converter temperature control system can trigger a rather alarming on the dash that tells the to #8220;SLOW DOWN#8221;.  This is sometimes accompanied by a loss of power and if the driver doesn#8217;t understand what is it can be a worrying moment.

The purpose of the is to protect the catalytic converters overheating, most commonly by fuel entering the exhaust and burning in manifold and Cat.  If happens then irreversible and damage can occur to the Cats and the (lambda) sensors.

The system by measuring the temperature of the exhaust exiting the Cat, if the temperature approximate 900 Celsius then the SLOW warning message is displayed on the (flashing).  If the temperature continues above 940 Celsius then SLOW message is lit continuously and the Motronic down the side of the engine (the CEL light is also lit but an code is not stored).

The exhaust gas temperature is measured by a in each Cat #8211; this shows how they are positioned in the cat

Each thermocouple is connected to are commonly called Cat ECU#8217;s 4 in the diagram below).  They are in a simple signal converter which takes the from the thermocouple and converts it a linear voltage between 0-5 (depending on the temperature of the exhaust  This voltage is sent to the ECU (Motronic) which then the operations detailed above.

There are a number of situations can trigger a slow down  When trying to diagnose the problem is the first thing to do is if the Cat is actually overheating.  If the message is upon first starting and the engine is still cold it is highly likely that the Cat is not too  If the message appears whilst then pull over the engine off and take a look at the #8211; if one of them is glowing red in the picture below then it is  Note: This is not my picture I taken it from Club .

Another way to check if one of the Cats is too hot is to use an IR reader on both cats if either is approaching 1000 Celsius it is overheating.  If the Cat is genuinely overheating then do not the car as costly damage can be done the unburnt fuel entering the system.  The most this is a faulty coil on the bank of cylinders that the hot Cat is to however a bad spark plug or a leaking inlet manifold are other common causes. way to pinpoint which cylinder is the problem is to use an IR gun on of the ports on the exhaust manifold.  If one than the others then is your problematic cylinder.

Ferrari 360

If neither Cat is overheating then the DOWN message is spurious and caused by a with the monitoring system.  It is possible that the thermocouple has gone bad and a first of call would be to check the between the thermocouple and Cat #8220;ECU#8221; as as the connections.  The thermocouple can be for resistance across the two connections if it is open then it has gone

The integrity of the ground at the Cat ECU should be #8211; test for continuity a known ground and the black (middle) on the connector that joins the wiring harness to the Cat ECU. is the wiring diagram for that connector:

If the earth is bad then check the of the harness.  The location of the on the rear chassis, under the and near to the exhaust valves exhaust) #8211; 11L 34L in the diagram (circled in red):

However, the likely issue is the Cat ECU itself as are prone to failure.  Moisture can the unit and cause it to stop  Ferrari actually updated the to try and counter these problems but still fail #8211; new number is 179278 (old is 173533).  You can tell if the revised model if the resin is as in the photo below:

There is an alternative to replacing the Cat with Ferrari items. have developed a system Cat ECU#8217;s and provides real exhaust gas temperature monitoring.  It#8217;s not but I have no doubt that it is far to the OEM system #8211; perhaps considering if your car is a keeper?

Ferrari 360
Ferrari 360
Ferrari 360
Ferrari 360
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