The car failed to start a month ago. And it was started again by
spraying some starting fluid. However, it failed the emission
inspection. Reason: Oxygen sensor not ready, EGR not ready, Catalyst
not ready. The ECM does not have any error code. When I check the
ignition timing with OBDII scan tool, it reads 63 BDTC from ECU when
idle. Using timing light ignition timing is unstable during idle.
However, it become 0-9 BTDC when rev engin to over 1000 rpm. The
specified ignition timing should be 8 BTDC. I checked the engine
coolant temp sensor, throttle position sensor, camshaft position
sensor, changed the oxygen sensor. Nothing corrected. I then checked
the crankshaft position sensor. It turns out that the crankshaft
position sensor does not receive any voltage (Should be 5 volt
according to the Haynes repair manual). So, I assumed the ECM has a
problem. But the problem still exists after I replace the ECM. Any
suggesionts? thanks
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Did you rotate the engine to see if the 5v comes up? If it was faulty I
wouldn’t have thought you would get a spark at all.
"XuMei" <UseLinkToEm…@AutoForumz.com> wrote in message
news:1_513805_18355bb887dc501e23941c1cba6fe0a5@autoforumz.com…
- Hide quoted text — Show quoted text -
> The car failed to start a month ago. And it was started again by
> spraying some starting fluid. However, it failed the emission
> inspection. Reason: Oxygen sensor not ready, EGR not ready, Catalyst
> not ready. The ECM does not have any error code. When I check the
> ignition timing with OBDII scan tool, it reads 63 BDTC from ECU when
> idle. Using timing light ignition timing is unstable during idle.
> However, it become 0-9 BTDC when rev engin to over 1000 rpm. The
> specified ignition timing should be 8 BTDC. I checked the engine
> coolant temp sensor, throttle position sensor, camshaft position
> sensor, changed the oxygen sensor. Nothing corrected. I then checked
> the crankshaft position sensor. It turns out that the crankshaft
> position sensor does not receive any voltage (Should be 5 volt
> according to the Haynes repair manual). So, I assumed the ECM has a
> problem. But the problem still exists after I replace the ECM. Any
> suggesionts? thanks
> —
> Posted using the http://www.autoforumz.com interface, at author’s request
> Articles individually checked for conformance to usenet standards
> Topic URL:
> http://www.autoforumz.com/Nissan-97-Sentra-fails-emission-test-pls-he...
> Visit Topic URL to contact author (reg. req’d). Report abuse:
> http://www.autoforumz.com/eform.php?p=513805