I am having a code 71 on my 94 LC, I have read about every thread I could find regarding this problem.
I checked:
1. Modulator & filter element, the modulator is the blue one so it has been replaced, it was total clean, no carbon what so ever, the filter was very clean, in fact it looked brand new.
2. All lines to the modulator, clean and free.
3. Tested EGR, passed
(First cut the problem domain in half by seeing if EGR is working when the valve is activated:
Disconnect the vacuum hose from the modulator to the EGR valve, this one will be pluged by your finger, then remove the second line of the tee fitting and put a long piece of hose on it(see picture), this is the one you will suck on. With the engine idling, suck on free end of the long hose. If the engine dies, then you know that the EGR valve is working and the passage is clear enough to flow exhaust gas)
I read on here if the you have a 93 or 94 and get a code 71 then it is your EGR temperature sensor. Where is the EGR temperature sensor and how do I clean it? I do not have the FSM from Toyota so if could please post a picture.
I checked:
1. Modulator & filter element, the modulator is the blue one so it has been replaced, it was total clean, no carbon what so ever, the filter was very clean, in fact it looked brand new.
2. All lines to the modulator, clean and free.
3. Tested EGR, passed
(First cut the problem domain in half by seeing if EGR is working when the valve is activated:
Disconnect the vacuum hose from the modulator to the EGR valve, this one will be pluged by your finger, then remove the second line of the tee fitting and put a long piece of hose on it(see picture), this is the one you will suck on. With the engine idling, suck on free end of the long hose. If the engine dies, then you know that the EGR valve is working and the passage is clear enough to flow exhaust gas)
I read on here if the you have a 93 or 94 and get a code 71 then it is your EGR temperature sensor. Where is the EGR temperature sensor and how do I clean it? I do not have the FSM from Toyota so if could please post a picture.
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