Engine - Fast Idle Speed/MIL ON/DTC P1506 Set

Article No.
98-21-21

10/26/98

^ IDLE - FAST IDLE SPEED AND/OR DIAGNOSTIC
TROUBLE CODE (DTC) P1506 STORED IN
MEMORY - VEHICLES BUILT WITH 4.6L, 5.4L, OR
6.8L ENGINE

^ MALFUNCTION INDICATOR LAMP (MIL) - MIL
ILLUMINATED AND/OR FAST IDLE SPEED WITH
31GDIAGNOSTIC TROUBLE CODE (DTC) P1506
STORED IN MEMORY - VEHICLES BUILT WITH
4.6L, 5.4L, OR 6.8L ENGINE

^ LAMP - MALFUNCTION INDICATOR LAMP (MIL)
ILLUMINATED AND/OR FAST IDLE SPEED WITH
DIAGNOSTIC TROUBLE CODE (DTC) P1506
STORED IN MEMORY-VEHICLES BUILT WITH
4.6L, 5.4L, OR 6.8L ENGINE

LIGHT TRUCK:
1997-98 ECONOLINE, EXPEDITION, F-150, F-250 LD
1998 NAVIGATOR





This TSB article is being republished in its entirety to add service parts, include a Part Application Chart, and to revise Figure 1.

ISSUE
The Malfunction Indicator Lamp (MIL) may illuminate and Diagnostic Trouble Code (DTC) P1506 may be stored in continuous memory and/or the engine idle speed may be higher than expected. This may be caused by black plastic flash from idle air bypass hose becoming lodged in the Idle Air Control (IAC) bypass valve.

ACTION
Refer to the Diagnostic Flow Chart (Figure 1) for diagnostic and servicing procedure.








Parts Block

OTHER APPLICABLE ARTICLES: NONE

SUPERSEDES: 98-13-17

WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage And Emissions Warranty Coverage

OPERATION DESCRIPTION TIME

982121A Perform TSB Diagnostics 0.8 Hr.
(Includes Replace Idle Air
Control Resonator And
Inspect Or Replace Idle Air
Control Valve) - Vehicles
Built Before 4/15/98

982121B Perform TSB Diagnostics 0.5 Hr.
(Includes Replace Idle Air
Control Valve) - Vehicles
Built After 4/15/98

DEALER CODING
CONDITION
BASIC PART NO. CODE
9H308 42

OASIS CODES: 206000, 608000, 608400, 619400, 698298