Power supply to intake temp sensor

Bernie Benz b.benz at charter.net
Tue Aug 5 11:18:01 EDT 2003

What are you saving your Bentley for, resale?


> From: "Derek Pulvino" <dbpulvino at hotmail.com>
> Date: Tue, 05 Aug 2003 09:50:29 -0700
> To: matt_20v at yahoo.com, 200q20v at audifans.com
> Subject: Re: Power supply to intake temp sensor
> Yes, I've been getting the error code since, well for a long time.  I've
> checked at the connections on the temp sensor and have not seen any frayed
> wires.  I had the connector off the ECU a coupe of weeks ago, and then
> realized that only one connection is listed for the temp sensor at this
> interface.  I assume this is the output from the resistor.  Not knowing
> which wire provided the input power to the sensor, I could't think where to
> attach the other connection on the ohm meter.  You're saying that power is
> supplied to the temp sensor from the ECU, but from which connection?  Is
> there one catch all power supply wire?
> Also, anybody know what the input voltage to the sensor is supposed to be?
> Derek P
>> Are you getting an error code for the sensor?
>> I recently traced an error code to a broken solder/
>> weld where the wire leads attach to the sensor.
>> Exactly as described by SJM.  The contact was
>> intermittent so the first time I checked with a meter
>> it ohmed good.  Need to wiggle the sensor wire tail
>> a bit to insure it has good integrity.  The sensor
>> is just  2-wire, it is powered and sensed by the ECU
>> itself.
>> You can and should ohm out the sensor connections
>> at the ECU connector.  SJM has a good writeup on
>> this, and Bentley also describes the procedure, just
>> find the section for troubleshooting the sensor error
>> code.
>> Matt Rooke
>> '91cq//20vt
>> '00S4//30vtt
>> --- Derek Pulvino <dbpulvino at hotmail.com> wrote:
>>> Before I spend an hour digging through some
>>> schematics, can anybody direct
>>> me to the above listed location?
>>> Was going to measure continuity at the ECU
>>> connector, and then realized that
>>> there's only one temp sensor connection at the
>>> ecu...so power's got to come
>>> from somewhere else and not to easy to measure
>>> continuity on an uncompleted
>>> circuit.  Thinking this is a bad connection
>>> somewhere as resistance at the
>>> resistor, and at the connection side of the sensor
>>> is always spot on.
>>> Derek P

More information about the 200q20v mailing list