6G Celicas Forums

O.K...After getting over the intial shock of finding out that I only need a paper clip to check the code on the check engine light I immediatly got on here to find out what this means. I got a code 71 and looked it up to find out that it means something is wrong with my EGR System. What could be wrong with the system? Is it costly? Should I be worried?

Still can't believe that the paper clip trick worked. lol saved me $80 at the mechanic.

This post has been edited by 95GTCelica: Oct 30, 2007 - 8:55 PM

Here's another shocker- all you need is a $.99 radio shack resistor to make it go away!!! Seriously, I'd check the EGR tube/ valve for blocked passages. Also could be the EGT sensor. The sensor is what you bypass with the resistor. Basically the gas flows thru the head from the exhaust, if the tube or passages are blocked the sensor doesn't warm up and it will show 71 in the ecu. It takes two drive cycles to trip the CEL so when you clean the stuff drive it, let it sit then drive it again to see if the CEL comes on. Keep us posted what you find.

thanks for the reply... Well i started it up this morning and the CEL didnt come on till about five min later but it stayed on for the whole trip. Then after sitting there for about seven hours I started it back up and the CEL never came on. I got home and decided to break out the manual and check it out. When I popped the top to the EGR vacume modulator I noticed the filter was pretty dirty and almost disintegrated in my hand when I tried to pull it out. It looked like this...



Looks like it needs to be replaced...Should I? Or just leave it alone because it looks like some people would rather just not have this system because "they believe EGR reduces power output".

I mean i dont really like the idea of something under the hood not working properly.

if you have acess to it, blow air through it..it might unclog it. If not then unbolt the 2 bolts on the back of your intake manifold where the EGR valve is and spray carb cleaner down it. It might brake up some of the carbon deposit. Also, double check all of your vacuum lines coming off that modual. I replaced my modual, EGR valve and cleaned my entire intake manifold thinkin thouse were the problems *some where*, but then found i had a vacuum line unpluged and broken.

will do thanks for the advice...ill have to wait till tommorrow when its light out.

12 ............... No "G", "G1", "G2" or "NE" Ignition Signal To ECM
Within 2 Seconds After Engine Is Cranked,
No "G" Ignition Signal To ECM For 3 Seconds
With Engine Speed Of 600-4000 RPM
Open In "G-" Circuit
13 ............................. No "NE" Ignition Signal To ECM When
Engine Speed Is Greater Than Approximately 1000 RPM,
No "G" Ignition Signal To ECM When "NE" Signal
Is Input 4 Times With Engine Speed Of 600-4000 RPM
14 .................... No "IG" Or "IGF" Ignition Signal To ECM From
Ignitor Several Times In Succession
16 ...................... Fault In Transmission/Transaxle ECU Or ECM
21 .............................. Defective O2 Sensor, Open Or Short
Circuit In O2 Sensor Signal
22 ......................... Open Or Short Circuit In Engine Coolant
Temperature Sensor Signal
24 ......... Open Or Short Circuit In Intake Air Temp. Sensor Signal
25 ............... Lean Signal Sent By O2 Sensor For Several Seconds
26 ............... Rich Signal Sent By O2 Sensor For Several Seconds
27 ................... Open Or Short Circuit In Sub-O2 Sensor Signal
28 ............................................ Defective O2 Sensor,
Open Or Short Circuit In O2 Sensor Signal
31 ................................ Open Or Short Circuit In Airflow
Meter Or MAP Sensor Signal
32 ........... Open Or Short Circuit Between Airflow Meter Terminals
34 ............................... Turbocharger Pressure Is Abnormal
35 ................. Open Or Short Circuit In Turbocharging Pressure
Sensor, MAP Sensor Or BARO Sensor
41 ........ Open Or Short Circuit In Throttle Position Sensor Signal
42 ............................. No Signal From Vehicle Speed Sensor
For Several Seconds
43 ..................... No "STA" Signal To ECM Until Engine Reaches
800 RPM With Engine Cranking
47 .... Open Or Short Circuit In Sub-Throttle Position Sensor Signal
51 ............... (2) Problem In One Of 3 Circuits Monitored By ECM
52 .................... Open Or Short Circuit In Knock Sensor Signal
53 .................................. Knock Control In ECM Is Faulty
55 .................... Open Or Short Circuit In Knock Sensor Signal
71 ................................... EGR Gas Temperature Less Than
Predetermined Level During EGR Control
78 ...................... Open Or Short Circuit In Fuel Pump Control
Circuit Or Fuel Pump Electronic Control Unit (ECU)
81 ................. Open In ECT1 Circuit Between ECM & Transmission
Control Module (TCM) For At Least 2 Seconds
83 ................. Open In ESA1 Circuit Between ECM & Transmission
Control Module (TCM) For 1/2 Second After
Engine Idles At Least 1/2 Second
84 ................. Open In ESA2 Circuit Between ECM & Transmission
Control Module (TCM) For 1/2 Second After
Engine Idles At Least 1/2 Second
85 ................. Open In ESA3 Circuit Between ECM & Transmission
Control Module (TCM) For 1/2 Second After
Engine Idles At Least 1/2 Second
(1) - Listed are possible areas causing trouble codes. Not all
trouble codes are used on all models.
(2) - Throttle position sensor, Park/Neutral switch and A/C Signal
circuits are monitored.

here hope this helps

just replace that part, better to have it all working. what if a more serious code comes up but you ignore it thinking its just the egr?

I just had the same code pop on me today, and come to find out they offer two different part numbers for the EGR. One for automatic transmission and the other for manual, even though they look like the very same part.

First question:
Is there a difference in the internals?

Secondly, since my Celi was originally an automatic that was converted to a manual which one do I buy, or does it even matter?

hmm tell the parts counter or service dept your dilema, some places are nice and will help out. i mean goto a dealer and ask....and then be nice and buy the dealer part.