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1999 Volkswagen Cabriolet P1450

Tiny
CABRIOQUESTIONER1
  • MEMBER
  • 1999 VOLKSWAGEN CABRIOLET
  • 90,000 MILES
Hi, I have a code p1450. I grounded the control wire from the air pump relay and the air pump turned on and at the same time 2 vacuum air solenoids next to the ignition coil did not come on. What could this problem be? How do I test the wiring coming to these solenoids, are these solenoids using the same control source wire? I don't have a scanner to check these wires.

I also checked the air pump control relay wire coming from ECM to the relay and there is continuity.

I checked the solenoids hanging near the ignition coil with 12 volts and it clicks and I can blow air through it once I applied power and can't when voltage removed.

I like to know what to check first before replacing the ECM. If I replace the ECM, what equipment do I need to make the unit work and will the old key still start the engine if ECM replaced?
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Friday, September 20th, 2013 AT 4:07 PM

10 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
I posted the trouble tree for the code its for the air injection solenoid shorted to voltage.I know it says to plug in that special tool that's a breakout box for pin out testing of the ecm connector. You will need a multi meter to do some testing.
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Friday, September 20th, 2013 AT 4:46 PM
Tiny
CABRIOQUESTIONER1
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  • 7 POSTS
So how do I obtain this book or article, because I only see part of it? Please advise. Thanks
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Friday, September 20th, 2013 AT 5:07 PM
Tiny
SATURNTECH9
  • MECHANIC
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Its paid online repair manual you pay for monthly that we use to help the users on this site. Its a login type deal so I cant just give you the login for it.I posted the rest of the article that didn't show up in the other info I posted.
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Friday, September 20th, 2013 AT 5:16 PM
Tiny
CABRIOQUESTIONER1
  • MEMBER
  • 7 POSTS
Oh! I see, thanks for sharing!
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Friday, September 20th, 2013 AT 5:24 PM
Tiny
CABRIOQUESTIONER1
  • MEMBER
  • 7 POSTS
I measured resistance between pin 49 to pin 6 and I got infinite, and pin 49 to positive terminal also I got infinite as indicated in the troubleshooting. So what these values suggests? What is the next step? Please keep posting. Thanks.
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Friday, September 20th, 2013 AT 6:27 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
The first trouble I posted says if those readings are what you have to replace the SAI relay and if the code comes back to replace the ecm.
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Friday, September 20th, 2013 AT 6:55 PM
Tiny
CABRIOQUESTIONER1
  • MEMBER
  • 7 POSTS
Ok, great! I see it now. I'll go grab a relay tomorrow and keep you posted. Thanks.
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Friday, September 20th, 2013 AT 6:58 PM
Tiny
CABRIOQUESTIONER1
  • MEMBER
  • 7 POSTS
But wait.I put a ground on pin4 of the SAI relay and it works, does this means the SAI relay is good?
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Friday, September 20th, 2013 AT 7:01 PM
Tiny
CABRIOQUESTIONER1
  • MEMBER
  • 7 POSTS
Also that the relay clicks and turned on the SAI pump.
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Friday, September 20th, 2013 AT 7:02 PM
Tiny
SATURNTECH9
  • MECHANIC
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Honestly just because it may work when you test it doesn't mean it may work when the code sets. Before I replaced the ecm I would try to replace the relay first. If it were my car that's what I would do.
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Friday, September 20th, 2013 AT 7:28 PM

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