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IAT Sensor 2005 VW New Beetle 1.8L turbo

  • pigloverme
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15 Mar 2019 20:09 #27858 by pigloverme
IAT Sensor 2005 VW New Beetle 1.8L turbo was created by pigloverme
CEL IAT Sensor 2005 VW New Beetle 1.8L turbo 5 speed trans
a DTC , PO 113 and PO 098 New OEM IAT sensor from VW, ,newer OEM ECM from VW. New wiring from ECM to IAT sensor. Scan IAT temp is always -40 degrees, jump signal to ground wire at sensor connector temp changes to +280 degrees. Signal wire has 4.7 volts KOEO at sensor and at ECM . IAT sensor grounded direct to battery ground No drivability issues .No other DTCs I need help or suggestions, Please

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  • cheryl hartkorn
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15 Mar 2019 20:24 #27859 by cheryl hartkorn
Replied by cheryl hartkorn on topic IAT Sensor 2005 VW New Beetle 1.8L turbo
sure sounds like a defective iat sensor. youve already proved the wiring and pcm arent the issue by jumping the terminals. try putting a resistor inplace of the sensor?
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  • pigloverme
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15 Mar 2019 21:45 #27861 by pigloverme
Replied by pigloverme on topic IAT Sensor 2005 VW New Beetle 1.8L turbo
I tested the Sensor on bench the resistance moves up and down when you apply heat ?

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15 Mar 2019 23:00 #27863 by pigloverme
Replied by pigloverme on topic IAT Sensor 2005 VW New Beetle 1.8L turbo
What size resistor would you use?
walt

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16 Mar 2019 04:17 - 16 Mar 2019 04:20 #27865 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic IAT Sensor 2005 VW New Beetle 1.8L turbo
A two wires sensor --- the two wires are live(which is also the signal) and ground ---- the problem is either an open in in the ground side. or an open sensor itself

(1) Substitute a resistor of about 1000 ohm for the sensor then look at the temperature reading if the wiring and ecu are okay it should read somewhere in the normal range.
(2) If it is you have a defective sensor
(3) If it isn't ground the ground side wire from the resistor directly to the cylinder block --- this should give a temperature reading somewhere in the normal engine running range,
(4) If this works remove the resistor and reconnect to the sensor but leave the jumper to ground connected and it should work normally.

"There's always a catch ---- Catch OBD2 ."


Last edit: 16 Mar 2019 04:20 by Andy.MacFadyen.

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