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1995 Sc300 Diag Code 71


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I did the 100K service recently - new belts, water pump, spark plugs. The car runs like new, except that now I get a check engine light when rolling along in 5th gear. It reads as a Code 71 - One suggestion in the manual is a 1 - 4 second error in the EGR temperature, which I tend to believe. The question is, everything was fine before, so why am I geting this now?

I suspect it is vacuum related, since the throttle body was removed to do the spark plugs. Any suggstions on troubleshooting. EGR appears OK its diaphram holds vacuum, opens and closes properly.

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I did the 100K service recently - new belts, water pump, spark plugs. The car runs like new, except that now I get a check engine light when rolling along in 5th gear. It reads as a Code 71 - One suggestion in the manual is a 1 - 4 second error in the EGR temperature, which I tend to believe. The question is, everything was fine before, so why am I getting this now?

I suspect it is vacuum related, since the throttle body was removed to do the spark plugs. Any suggestions on troubleshooting. EGR appears OK its diaphragm holds vacuum, opens and closes properly.

Update:

If anyone is interested I found these in the Mitchel service. They suggest using hot oil immersion for testing the resistance.

EGR TEMPERATURE SENSOR RESISTANCE TABLE

øF (øC) Ohms

112 (50) ................................... 64,000- 97,000

212 (100) .................................. 11,000- 16,000

302 (150) ...................................... 2,000- 4,000

Also Code 71 is a "two trip code" so it will not show up on the first test drive. You will need to shut off the engine, restart, and test drive again in order for the code to set again after being cleared. (or maybe not if you fixed it :-))

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