Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

996 - IACV Frequency

shalco
 Share

Recommended Posts

  • Admin
Loren Member

Loren

Posted
  • Admin
Posted

The manual does not say - only that the two coils control the pulse duration. The troubleshooting is verifying that the two coils are working.

"Idle speed control is realized via the idle air control (lAC) valve. Two coils, the opening coil and closing coil, are integrated in the lAC valve for this purpose.

The basic or emergency position is that adopted when neither of the coils is triggered. To increase the rpm, the opening coil is triggered with a certain pulse duty ratio; to reduce the rpm, the closing coil is triggered."

  • Admin
Loren Member

Loren

Posted
  • Admin
Posted

Check coil resistance of lAC valve.

1. Remove connector of lAC valve.

2. Connect ohmmeter to pins 2 and 1 of lAC valve.

Display: 14 - 17 ohms at 20°C.

Check wiring from DMIE control module to lAC valve for continuity.

1. Remove connector of lAC valve.

2. Connect special tool 9616 to wiring harness (DME control module connector).

3. Connect ohmmeter to special tool 9616, pin 2, and to lAC valve connector, pin 1.

Display: 0 - 5 ohms

If infinite ohms is displayed, check wiring harness for chafing and pinching damage.

Check wiring from DME control module to lAC valve for short circuit to ground.

1. Remove connector of lAC valve.

2. Connect special tool 9616 to wiring harness (DME control module connector).

3. Connect ohmmeter to special tool 9616, pin 2, and ground.

Display: infinite ohms

If 0 - 5 ohms is displayed, check wiring harness for chafing and pinching damage.

Check wiring from DME control module to lAC valve for short circuit to B+.

1. Remove connector of lAC valve.

2. Connect special tool 9616 to wiring harness (DME control module connector).

3. Connect voltmeter to special tool 9616, pin 2, and ground.

Display: 0 V

If battery voltage is displayed, check wiring harness for chafing and pinching damage.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.