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Audi 100, S4: 1992-1994, A6, S6: 1995-1997 (C4) 1997 audi a6 no spark


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Last Post: Jan 17, 2015 10:39 PM Last Post By: a6hcw
Audissues

Posts: 7
Registered: 05/24/12
1997 audi a6 no spark
Posted: May 24, 2012 6:23 PM
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I was testing differnt thing i have no spark and all fuse are ok. I check for power on ignition Control module and have nothing on pin 2 and 4 so what should i check next? i already replaced the ignition switch with a new one. i am thinking power issue somewhere. where does the ignition control get its power from the ecu?
FKH161

Posts: 7,658
Registered: 12/29/05
Re: 1997 audi a6 no spark
Posted: May 25, 2012 12:34 AM   in response to: Audissues in response to: Audissues
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2.8L? See attached image... fuse s103 feeds the coils.
Audissues

Posts: 7
Registered: 05/24/12
Re: 1997 audi a6 no spark
Posted: May 25, 2012 4:26 PM   in response to: FKH161 in response to: FKH161
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yes 2.8 v6 thanks for the response! uh so where do i find that fuse to verify that there is power their? the diagram posted is hard to understand some time i wonder about the person who wrote these schematics any other ideas would be appreciated
Audissues

Posts: 7
Registered: 05/24/12
Re: 1997 audi a6 no spark
Posted: May 25, 2012 4:44 PM   in response to: FKH161 in response to: FKH161
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yes 2.8 v6 thanks for the response! uh so where do i find that fuse to verify that there is power their? the diagram posted is hard to understand some time i wonder about the person who wrote these schematics any other ideas would be appreciated
FKH161

Posts: 7,658
Registered: 12/29/05
Re: 1997 audi a6 no spark
Posted: May 25, 2012 4:44 PM   in response to: Audissues in response to: Audissues
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Supposedly that fuse is under the carpet with the ECM.

It's easier to check for power at one of the wires on the coil packs... the blk/green wires should have power when the ignition is ON.
Audissues

Posts: 7
Registered: 05/24/12
Re: 1997 audi a6 no spark
Posted: May 26, 2012 3:29 AM   in response to: FKH161 in response to: FKH161
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sorry that don't make any sense. thanks for trying to help!
the ignition coils receive voltage from the ignition module while the motor is cranking if motor not cranking no voltage at ignition coil. the ignition module is really a amplifier it takes the voltage from the ecu and amplifies it to at least 1k volts then the coils amplify the voltage more. the ecu receives signal from the crank position sensor and the cam sensor to alter the timing of the spark and send a low voltage of around five volts to the control module. the control module should have at least 10 volts on one wire while key on and 5 volts pulsed on the other connections coming from the ecu. i am lacking voltage at the control module. i suppose i should test if i am getting pulse from the ecu. i suppose it would be easy to check and see if i got pulse from the ecu too. i think my problem lies with where the control module gets its power. problem is I not sure how many different things can break the power getting to the control module. I know fuse and ignition switch can cause it but i checked those. i am sure their is few other things in between like maybe security system or some other safety system. next track back to where that wire goes see if that part has failed or if i need to track further back. I know how Ignition system should work just not sure how audi put them altogether. thanks again for your input and if you think of something let me know and thank you.
Audissues

Posts: 7
Registered: 05/24/12
Re: 1997 audi a6 no spark
Posted: May 26, 2012 3:51 AM   in response to: Audissues in response to: Audissues
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just checked to see if i am getting pulse from the ecu to the control module and i am so the brown white wire that powers the control module is the problem if i can locate the bad link prior to that i would have this thing solved. thinking anti theft maybe or airbag system maybe if i knew where that other end of that wire went things would be great!
FKH161

Posts: 7,658
Registered: 12/29/05
Re: 1997 audi a6 no spark
Posted: May 26, 2012 11:28 AM   in response to: Audissues in response to: Audissues
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Attachment IgnPower.jpg (319.1 KB)
Thanks for the Ignition 101 refresher... a couple of questions:

  • does check engine light come ON when the key is ON
  • if yes, then the ECM is getting power
  • if no, then that might be your problem.

I edited the wiring diagram to explain my "checking for power at the coil"

  • the red mark at the top left indicates "ignition power when the key is ON"
  • the power flows through the fuse S103
  • and then goes to the coil packs N, N128 & N158
  • the + side of the coil ALWAYS has power when the key is ON
  • the ECM controls the "Power Output Stage" (next page to the right of this wiring diagram)
  • the Power Output Stage controls the coils via the #1 terminals in the diagram

If the check engine light is ON (ECM has power) & you have power at the Ignition Coil #15 terminals, but you have no spark... then either you have a bad Crankshaft Speed Sensor or a bad Camshaft Position Sensor.

If a camshaft position sensor fails while the engine is running... the engine will continue to run, but will not start after the engine has been turned OFF.

A bad crankshaft position sensor will stall a running engine and prevent the engine from starting again.

I'll post some more wiring diagrams & info once I find it.
FKH161

Posts: 7,658
Registered: 12/29/05
Re: 1997 audi a6 no spark
Posted: May 26, 2012 12:02 PM   in response to: FKH161 in response to: FKH161
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Attachment A6_Wiring.jpg (874.6 KB)
I spliced all ECM wiring diagrams together and used some colors to join connections... so it is easier to follow the flow of power.

  • red is battery power
  • yellow is the Check engine light
  • blue is the throttle ground
  • brown is the MAF ground & shunt
  • green is the connection from Power Output Stage to Coil Pack

Using this diagram, you should be able to trace all the wires to check them for power & ground... to help you find your problem.

I'll post more once I find what I'm looking for..
FKH161

Posts: 7,658
Registered: 12/29/05
Re: 1997 audi a6 no spark
Posted: May 26, 2012 12:27 PM   in response to: FKH161 in response to: FKH161
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Attachment aah003.pdf (68.5 KB)
Attachment aah002.pdf (58.9 KB)
Attachment aah001.pdf (39.3 KB)
Attachment aah.pdf (228.1 KB)
A few PDFs for you...
Audissues

Posts: 7
Registered: 05/24/12
Re: 1997 audi a6 no spark
Posted: May 26, 2012 2:13 PM   in response to: FKH161 in response to: FKH161
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hey thanks man those images helped a lot!!
no power going to coils!!!! checked connector b no voltage.
i was wrong on previous assumption that the brown white wire was power in fact after looking at schematic it was ground and retested for ground connection and shows good ground.
i was unsuccessful at locating the fuse for connection b the diagram says right hand side foot well yellow connector so that is under the dash on passenger side correct? i did not see any fuse their but a bunch of connections i will dig deeper when i get home from work darn car has lots of wire LOL oh yeah you where correct from the beginning of checking power wire at coil so no power their and nothing at connection b on firewall white connector with black green wires.
FKH161

Posts: 7,658
Registered: 12/29/05
Re: 1997 audi a6 no spark
Posted: May 26, 2012 2:35 PM   in response to: Audissues in response to: Audissues
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I you can't find the 15amp fuse for Ignition Coil Power, you can:

  • Only do this if you agree, at your own risk, I am not responsible if you fry something

Attach a "15amp fused" jumper wire to battery + and then attach the other end to the coil power wire blk/green.

If there is more than one blk/green wire, that's OK... you only need to power-up one, as the others will get power from the same blk/green wire (at a junction point).

If the engine can now be started... it confirms that the stock fuse S103 is most likely blown.
a6hcw

Posts: 2
Registered: 01/01/06
Re: 1997 audi a6 no spark
Posted: Jan 11, 2015 6:40 PM   in response to: Audissues in response to: Audissues
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I am having a similar problem with my 1996 Audi A6 Quattro Avant with a 2.8L AFC engine, which is getting no spark, The car engine died while being driven. A 1997 Audi A6 should in North America also have the AFC engine and not the AAN engine. The1996 AFC engine has the crankshaft position sensor CKP, the RPM sensor and the camshaft position sensor. The RPM sensor is located at the left rear of the engine at the flywheel teeth. The 1996 AFC has an 8D0906266A or 8D0906266B ECM, different wiring diagrams than the AAN and is OBDII. I have checked the continuity between the CKP and RPM sensors and the ECM. I have checked the camshaft sensor terminals for the correct voltage and ground. I have tried different CKP and RPM sensors and three different used ECMs. I have been unable to get an LED to flash at the terminal for input to the ignition module. The car does not have an immbobilizer, so why is there no spark and no error codes? All three used ECMs and the existing ECM are coded 01242 per VCDS by Ross-Tech. Is there some way to use the VCDS to monitor the CKP and RPM sensors with an engine being cranked instead of running? My Avant only has 104,442 miles.
a6hcw

Posts: 2
Registered: 01/01/06
Re: 1997 audi a6 no spark
Posted: Jan 17, 2015 10:39 PM   in response to: a6hcw in response to: a6hcw
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Apparently, my 1996 Audi A6 Quattro Avant with the 2.8L AFC engine may have had a defective timing belt, which caused the timing between the camshafts and the crankshaft to be so far off that there was no spark. The timing belt tensioner bolt was still tight. The timing belt was loose and had not broken. I have ordered a new timing belt to install next week, since I don't want to risk a broken timing belt. So, if you get no spark and get no error codes, then it could be bad timing between the camshafts and the crankshaft. That is why it is important to use the correct tools and instructions when doing the timing belt.

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