its a 96 B18c obd1 in a 99 em1 but im using a obd2b si ecu the jdm b18c is in the mail with harness. the check engine light is on for code p0113 which is Intake Air Temperature (IAT) Sensor Circuit High Voltage. I've check the sensor and theres power to it and I've already tried replacing the iat but its still there, and i do not have a volt meter but i have one of the light up pens i forgot wat u call it but it does light up lol. any suggestions guys?


Modified by ondenoantra at 11:26 AM 11/10/2007

 

anyone?

 

come on guys I've searched for weeks and still didnt find anything

 

bump

 

I had this same problem when swapping a type r in my EK, i had to change the IAT from the intake tube to the intake manifold, because thats where it is on a type r.

 

Did you remember to reset set the ecu, pull the hazard fuse? Just a thought?

 

yea the iat is already on the im and the did reset the ecu many times lol. could it be a vaccum problem causing this?

 

did u extend the plug on the intake arm to reach the manifold IAT.. because that plug with all the injectors is for the purge solenoid.

 

Anyone fix this??? Sorry old thread lol, I have a b18c gsr in a ek coupe and it’s throwing code 10. I checked both wires running to the ecu, they have the correct power. I just now replaced the iat sensor and the code still occurs, my ecu right now is a p28 with a p72 basemap on it. Trying to solve this code so I can get it properly tuned! Anyways i cleared the code after replacing the sensor on my s300 still occurs. Any suggestions? I’ve extended it to my intake manifold cause originally it was in the arm. Went from obd2b > obd1

 

Make sure where you lengthened the wire isn't damaged. I am not sure what you meant by "I checked both wires running to the ecu, they have the correct power.", but only the red/yellow wire goes back directly to the ECU. The green/black wire is a ground wire and it goes to the junction plug under the intake manifold, so what you actually need to do is check continuity on the red/yellow wire between the IAT sensor plug and the proper position at the ECU, and then continuity on the green/black wire between the IAT sensor plug and the junction plug. You will need to remove the junction cap to find the correct wire (assuming it is not broken). If there is no continuity, re-install the junction cap and check continuity between the IAT sensor plug and the control ground pin location at the ECU plugs. IF there is still no continuity, chances are good that the problem is somewhere between the IAT sensor plug and the junction plug, so you will need to check the wire in between for any breaks.

 

Sorry I worded that like an idiot. I tested the red/yellow to the ecu. What did you mean by the junction plug? Little confused on what that is, I know you said under the manifold. What does it look like? I’m starting to think it’s a bad ground.

 

There are two large plugs on the main harness bundle under the intake manifold... one is Grey and the other is Blue. These have wires coming into each plug but are CAPPED... no wires come out of the other side. The cap has metal male jumper pins to connect/distribute one input wire to multiple outputs. Each plug will have two different colored wire types... essentially creating two wiring distribution points on each plug. You will be looking for the plug that has the green/black wires in it. Remove the jumper cap exposing the female pins. You can then test continuity between these pins and where they terminate at various sensors. Remember that you will find the same color wire going to the ECT sensor, TPS sensor, the ECU, O2 sensor and IAT sensor. If the wire is broken between this junction plug and the IAT sensor, you will have to eliminate all other wires in the plug so you KNOW which one to definitively test for the IAT sensor.

 

When you use your light up thing, connect it to the GND of the battery and start inserting into MAF connector pins in the harness. And check on the scanner at the same time the MAF parameters. If the wires are okay, then you'd be able to identify the +12 side and the signal side. Therefore, make sure your writing is not damaged