97 A6 2.8 v6 Quattro - No injector pulse
#1
03-18-2011, 12:26 PM
97 A6 2.8 v6 Quattro - No injector pulse
I have a 97 a6 2.8 quattro (AT, 229k miles) AA printed on the cyl head) that I am no longer getting an injector pulse on (not even batch firing the injectors at startup...nothing)
I have good fuel pressure and voltage at every injector. I plugged in my actron scanner and it had no codes after 10 or so failed starts. I ran the live info utility on the scanner and it told me that my engine speed (without the engine running) was fluctuating between 31 and 60 rpm.
This lead me to believe that it was the crankshaft position sensor, so I replaced it with a new one. Since replacing it, I now have a po322 code in the ecu. ( ignition / engine speed input circuit no signal). I have checked and reseated the connectors and reseated the sensor as well, but the code keeps coming back. I get about 200 Ohms resistance between two of the pins and no continuity between one pin and the two others. From what I could research, that sounds like what I should have?
I obtained a known working ECU and received the same code, so I know its down to wiring or the sensor.
Should I be getting some voltage to the connector that is on the bank next to the the firewall when the key is in the 'on' position? And if so, what Pin on the connector? Or is voltage only going to that connector during 'starting' and once the engine is actually running?
The other thing is: which connector on the ECU does the Crankshaft Position sensor wiring go to? I see alot of connectors on there with the same color wires that connect to my sensor's plug.
The funny thing is that the old sensor didn't cause the ECU to throw a code, I just had an inaccurate reading on the engine speed (it was reading RPM when the engine was not running)
I posted this thread on Vortex as well
I have good fuel pressure and voltage at every injector. I plugged in my actron scanner and it had no codes after 10 or so failed starts. I ran the live info utility on the scanner and it told me that my engine speed (without the engine running) was fluctuating between 31 and 60 rpm.
This lead me to believe that it was the crankshaft position sensor, so I replaced it with a new one. Since replacing it, I now have a po322 code in the ecu. ( ignition / engine speed input circuit no signal). I have checked and reseated the connectors and reseated the sensor as well, but the code keeps coming back. I get about 200 Ohms resistance between two of the pins and no continuity between one pin and the two others. From what I could research, that sounds like what I should have?
I obtained a known working ECU and received the same code, so I know its down to wiring or the sensor.
Should I be getting some voltage to the connector that is on the bank next to the the firewall when the key is in the 'on' position? And if so, what Pin on the connector? Or is voltage only going to that connector during 'starting' and once the engine is actually running?
The other thing is: which connector on the ECU does the Crankshaft Position sensor wiring go to? I see alot of connectors on there with the same color wires that connect to my sensor's plug.
The funny thing is that the old sensor didn't cause the ECU to throw a code, I just had an inaccurate reading on the engine speed (it was reading RPM when the engine was not running)
I posted this thread on Vortex as well
Last edited by Bstjohn; 03-18-2011 at 12:33 PM.
#2
03-18-2011, 02:49 PM
New update: there are two different style Crank Position Sensors for a 2.8 V6 in '97. The car parts place stated they ordered me the wrong one. Something about if you have an original with the gray cabling (which I do), that there is a different sensor for the car. I picked up the 'correct' one and will try that.
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