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Maximum Isc Extension (deville & Fleetwood) Buick Estate Wagon

Adjustments ~145 words
  1. Prior to adjusting maximum ISC extension, check minimum idle and TPS adjustment. See «MINIMUM IDLE (DEVILLE & FLEETWOOD)»(ref-10116-S06948393932000110900000) and «THROTTLE POSITION SENSOR (TPS)»(ref-10116-S28985434242000110900000) in this article. With igniton on and engine off, select ECM "ISC MOTOR" override E.5.3. Fully extend the ISC motor by pressing "WARMER" button on the Electronic Control Center (ECC) on dash. Fuel data center should display E.5.3 and 99 alternately, indicating override function has started.
  2. ISC should extend to maximum extend position. With the ISC at maximum extended position, the TPS voltage should be between 1.15-1.20 volts. If TPS is not within this range, adjust ISC plunger. Adjust ISC plunger, clockwise or counterclockwise, until TPS parameter reads 1.18 volts.
  3. Recheck maximum extend setting. Press "COOLER" button to retract ISC plunger. Wait 5 seconds. Press "WARMER" button and check TPS voltage. Readjust ISC plunger is necessary.

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