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Skyline V35 2002 Gt300 Fault Code P1401

geoskyline
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geoskyline Rookie

geoskyline

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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 Grand Master

scotty nm35

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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.

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geoskyline Rookie

geoskyline

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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?

scotty nm35 Grand Master

scotty nm35

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Posted

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 Rookie

geoskyline

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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 by geoskyline
geoskyline Rookie

geoskyline

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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.

geoskyline Rookie

geoskyline

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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.

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