99 Diablo SV throwing some codes.......help!

Assuming the car is OBD II:

OBD II Fault Code

OBD II P0112

Fault Code Definition
The Intake Air Temperature Sensor converts the air temperature into a voltage that is high when the Intake Air is cold and low as the engine warms up. P0112 indicates a low voltage input from the Intake Air Temperature to the Powertrain Control Module.

Symptoms

Check Engine Light will illuminate
In many cases, no abnormal symptoms may be noticed
In some cases, the engine may be hard starting and/or get poor fuel economy

Common Problems That Trigger the P0112 Code

Defective Intake Air Temperature Sensor
Dirty air filter
Defective Mass Air Flow Sensor
Faulty or corroded Intake Air Temperature wiring or connections

OBD II Fault Code

OBD II P0111

Fault Code Definition
The Intake Air Temperature Sensor converts the air temperature into a voltage that is high when the Intake Air is cold and low as the engine warms up. Code P0111 is triggered when there is problem in the signal range from the Intake Air Temperature Sensor to the Powertrain Control Module.

Symptoms

Check Engine Light will illuminate
In many cases, no abnormal symptoms may be noticed
In some cases, the engine may be hard starting and/or get poor fuel economy

Common Problems That Trigger the P0111 Code

Defective Intake Air Temperature Sensor
Dirty air filter
Defective Mass Air Flow Sensor
Faulty or corroded Intake Air Temperature wiring or connections

I'm not a Lambo tech though...I'd get a second opinion from a certified tech unless some else on here know the Diablo engine systems.

 

In most cases the air temp sensor is incorporated into the mass air flow senser housing, generally the sensor is low voltage with a normal range of 1 to 4 volt reading. Check the MAF plug terminals, it only takes a little corrosion or a loose terminal to cause the voltage to go out of range. If you have access to a wiring diagram you can jump the termials at the connector and check the response with the scan tool live data feed. This would confirm that the wiring and ECM functions for that circuit are ok. If the circuit test is good and the connection is good, then the MAF is most likely the culprit. Regards, Rick

 

Lambo Stuff and AMH exoticparts are a couple of vendors. There's more. If you going to DIY, which is good, your going to have to narrow it down, then buy the part. There's a certain amount of guess work involved.

 

I had the same issue on my 97.5, as the shop was doing the engine out, replaced both intake temp sensors. Those sensors are very hard to obtain.

Also if I remember correctly left sensor is for the right bank, right is for the left.

 

IAT Sensor from Lamborghini nearly $300.00 EACH.

Ford Cosworth Air Temp Sensor ACT - WTS186 / ATS04 | eBay

eXACT SAME PART $30.00

 

It's been almost a year mine were replaced, if you're getting a R CEL it's your left sensor triggering it, at least that's what I was told.

 

Check all grounds. There might be a loose wire somewhere.

 

P0111 = Air Temperature sensor fault
P0112 = Air Temperature sensor low signal (less than -20 C)
P1111 = Air Temperature sensor fault (cyl bank 1/6)
P1112 = Air Temperature sensor fault (cyl bank 7/12)

Standing at rear of car looking forward, bank 1/6 is the left bank. Seems to me you have more than enough info to know what the issue is. The codes are your test. Buy the right part - not one that just "fits".

-mick

 

Not sure if this will work, but did you unplug the battery after you put in the new sensors? I'm sure you cleared the codes with the OBD detector, but there may be a re-learing process once you start up the car after you connect the battery back on.

 

That is correct - P0111 and P0112 are generic codes and are reported by both LIEs. The more interesting codes are P1111 or P1112.

There is no difference between and 98 and 99 in this area. However, I will bet $1 that a non lambo business advertising a sensor like this as being compatible with a Diablo is bogus.

Seems pretty clear to me and worth a shot at $30 to at least compare the parts. You should know that ferraribooks is lambo knowledgeable.

Obviously an issue that you need to clear up.

-mick

 

No OBDII reader will clear the codes nor do any reset to the LIEs - simply ain't going to happen.

-mick

 

So did you try to disconnect the battery for a few hours?

 

I have made a jumper for clearing codes at the connection.

Info here: Lamborghini Engine Fault Code Removal

 

Each bank is controlled by one LIE thus you have two LIEs that talk to each other via a CAN bus. The LIEs generate and record the OBDII fault codes along with a bunch of other info. Also attached to the CAN bus is the GFA which is the module that supports the OBDII connector, protocol and reporting of the LIE OBDII fault codes. The reader can issue the reset command to the GFA but there is no mechanism for the GFA to "pass on" the reset the LIEs.

And thats what you need. Further, if you are having trouble with the readiness indicators when you are running OBDII fault free, you maybe missing the LIE recall/reflash. Call a lambo dealer with your VIN to confirm.

-mick

 

hey, YOU are the wizard here ...