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TSB
96-11-9
  • MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED - CODE P1411 STORED IN MEMORY - VEHICLES BUILT THROUGH 12/1/95 - CALIFORNIA EMISSION VEHICLES ONLY
  • LAMP - MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED - CODE P1411 STORED IN MEMORY - VEHICLES WITH 7.5L ENGINE AND BUILT THROUGH 12/1/95 - CALIFORNIA EMISSION VEHICLES ONLY
Publication Date: MAY 20, 1996

LIGHT TRUCK:
1996 ECONOLINE, F SUPER DUTY, F-250, F-350

This TSB article is being republished in its entirety to provide Powertrain Control Module (PCM) applications.

ISSUE:

The Malfunction Indicator Lamp (MIL) may illuminate and Code P1411 may be stored in memory on some vehicles. This may be caused by California OBD II diagnostics performing a functional test of downstream thermactor air each time the vehicle is driven. The downstream air test is conducted during an idle. During periods of idle operation and high underhood and inlet air temperatures, a slight decrease in thermactor pump efficiency coupled with very high efficiency of a low mileage catalytic converter can result in a MIL illumination and/or code P1411 in memory.

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