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Re: Computers (16V) CIS-E Procedure



It is important to have the proper tightening torque on the knock sensor, otherwise it won't work right.  Scirocco 16v is 7-9 ft.lbs. of torque.

Knock sensor diagnosis (Scirocco 16v only)- To display faults stored in memory:
1. Connect an LED test light between the test connector (up by throttle body on top) and + battery terminal.
2. Switch the ignition on, - the test light should go on.
3. Start the engine - the test light should go out (a slight glow is ok)
4. Briefly raise the engine speed to at least 3000 rpm.  If the test light comes on again, proceed with the next step.  If not, there are no faults stored in memory.
5. With the engine idling and the test light connected, use a jumper wire to ground the test connector for at least 3 sec.

Note - Do not switch the ignition off during this step.  Doing so will permanently erase the fault memory.

Series of 2 flashes indicate a fault in the wiring harness, the knock sensor, or the knock sensor control unit.  Loosen and retighten the knock sensor using the proper tightening torque.
Series of 3 flashes indicate a problem with the vacuum connection to the knock sensor control unit.  Check vacuum hose for kinks or damage, replace if necessary.  If the vacuum hose and hose connections are OK, the knock sensor control unit is faulty and should be replaced.

Hope this helps... Let me know if you need more info.

Sal Guzzo wrote:

I wasa thinkin', how do I check to see if the knock sensor box and the O2
sensor box are working?  I attempted to start the 81 rocco 16V with a
battery starter and she spin nicely.  Unfortunately, it didn't even wanna
backfire.  Disappointment crossed my path but I'm sure that it'll eventually
start.  I'll try adjusting the air flow path and if nada results, it's off
to Motronix!!!!
--
DanK
'87 16V Black
My Scirocco Page
http://www.uwm.edu/~kroenke
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