Skyline V35 2002 Gt300 Fault Code P1401

[geoskyline]

Hi guys

I'm new on this forum, hope starting this topic in right place

I recently cleaned throttle body and intake collector. doing this I accidentaly made puncture on EGR temp sensor's coolant hose. I found it out later, drove for one day I fixed the puncture, but check engine came out . I scanned my car at local dealer's shop, p1401 faulty code "EGR Temp sen/circ" came out. I tried to reset ECU, but did not solved my problem, after 3-4 km driving check engine is coming again.

Is there any chance to fix it?

[scotty nm35]

You damaged the temp sensor. No big deal, you ca either replace the sensor or trick the ecu into thinking it is still in the circuit with a similar resistance soldered over it's wires.

Before you go further, can you make sure the temp sensor is plugged in properly? It's behind the plenum and throttle, thin white wire.

[geoskyline]

You damaged the temp sensor. No big deal, you ca either replace the sensor or trick the ecu into thinking it is still in the circuit with a similar resistance soldered over it's wires.

Before you go further, can you make sure the temp sensor is plugged in properly? It's behind the plenum and throttle, thin white wire.

maybe is's overheated because of coolant leakage I know it is not big deal, I hate this sensor, it makes intake collector dirty

I checked it and connection is ok. How can I trick the ECU? which exact tips to solder?

[geoskyline]

one more question - by default this sensor's valve is open or closed?

[scotty nm35]

It's only a temp sensor, not the solenoid.

[geoskyline]

It's only a temp sensor, not the solenoid.

is there any chance to bypass this engine check?

[scotty nm35]

Did you block the egr? If so you will need to put a resistor over the temp probe to get rid of the MIL.

Otherwise something is wrong with the temp sensor or the wires that connect it to the ecu. Did you forget to plug the temp sensor back in?

[geoskyline]

I disconnected EGR itself and it's coolant hoses. Then pluged them back. I do not know where the EGR temp sensor is located could you upload photo of sensor itself?

Thanks guys for helping me.

[geoskyline]

Guys i fixed it. One of the plufs was not plugged completely.

Thank you guys anyway for your response.

[geoskyline]

If I may, i have one more question:

My friend's 2005 250gt has problems with RPM, they are unstable. We resetted ecu several times and made idle air flow learning. Sometimes when he drives and turns gear to N rpms goes up to 1200-1500 and after switching to D gearbox is kicking hard

we checked on scanner and there are no ongoing faulty codes.

What can be the cause of this jumping rpms?

Edited April 2, 2014 by geoskyline

[scotty nm35]

Did someone clean the throttle? Check all the vac lines are connected and not leaking.

You will probably need to do a throttle re-learn.

[geoskyline]

Did someone clean the throttle? Check all the vac lines are connected and not leaking.

You will probably need to do a throttle re-learn.

Did someone clean the throttle? Check all the vac lines are connected and not leaking.

You will probably need to do a throttle re-learn.

nope, nobody has done throttle body clean. I know what you mean, but this RPM jumping occurs occasionally, not always.

[scotty nm35]

Something is letting excess air into the plenum occasionally, perhaps the egr valve is sticking open due to crud?

[geoskyline]

Something is letting excess air into the plenum occasionally, perhaps the egr valve is sticking open due to crud?

obviously the problem is mechanical not electrical. If problem would be electrical it should cam up on scanner

when my friend bought the car he fixed the loosen chain. is it possible mechanic did not fixed it properly, as i know chain has a mark points to sync it to engine.

[scotty nm35]

If the chain wasn't aligned, it wouldn't drive well. (If at all.)