1997 Audi A4 no start

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1997 AUDI A4
4 CYL
AWD
AUTOMATIC
105,000 MILES

Well here we go no start check fuel ok, check spark no spark, check at the coiil and it have battery volt but no trigger signal this car have a power transistor check transistor it have battery volt but no control signal, replace speed sensor which sence tdc for this model also cam sensor is new check timing seems to be ok now for the help could it be the ecm? Does the ecm have a relay or fuse could it be the car alarm that was install about 2 month ago?I did change the battery about 3 weeks ago also there is no odb codes

4 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Check and test the crankshaft position sensor's resistance it should be 1K ohms

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Sunday, January 18th, 2009 AT 2:07 PM

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The engine speed sensor provides the ecm whit crankshaft position signal on this model which I replace

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Sunday, January 18th, 2009 AT 4:51 PM

RASMATAZ

MECHANIC
75,992 POSTS

Test the coil primary and secondary winding resistances and also retest the camshaft position sensor and engine speed sensor- and ignition coil power outage stage if okay you could be looking at the ECM

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Sunday, January 18th, 2009 AT 5:31 PM

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4 POSTS

Thanks but I all ready replace crank sensor and cam sensor, still no spark this car have a power transistor I check the 4 pin side and I have battery volt but on the 5 pin which 1 is ground there is no volts when cranking from none of the 4

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Sunday, January 18th, 2009 AT 11:05 PM