EVAP Line - MIL Illuminated/Trouble Code P0455
Article No.98-23-25
11/23/98
^ MALFUNCTION INDICATOR LAMP (MIL) - MIL LAMP
ILLUMINATED WITH DIAGNOSTIC TROUBLE CODE
(DTC) P0455 STORED IN MEMORY - VEHICLES
BUILT THROUGH 11/30/97 EQUIPPED WITH E4OD
TRANSMISSION AND 5.4L ENGINE
^ LAMP - MALFUNCTION INDICATOR LAMP (MIL) -
MIL LAMP ILLUMINATED WITH DIAGNOSTIC
TROUBLE CODE (DTC) P0455 STORED IN
MEMORY - VEHICLES BUILT THROUGH 11/30/97
EQUIPPED WITH E4OD TRANSMISSION AND 5.4L
ENGINE
LIGHT TRUCK:
1997-98 EXPEDITION, F-150
1998 F-250 LD, NAVIGATOR
This TSB article is being republished in its entirety to include 1998 model year vehicles as well as Navigator and F-250 LD vehicles.
ISSUE
The Malfunction Indicator Lamp (MIL) may illuminate and Diagnostic Trouble Code (DTC) P0455 may be stored in memory. This may be caused the Vapor Management Valve (VMV) vacuum supply line coming in contact with the Exhaust Gas Recirculation (EGR) valve body.
ACTION
Replace the engine vacuum harness assembly. The revised vacuum harness has a different routing to reduce the possibility of contact with the EGR valve body (Figures 1 and 2). Refer to the following Service Procedure for details.
SERVICE PROCEDURE
1. Use Service Bay Diagnostic System (SBDS) or New Generation Star (NGS) Tester to verify DTC P0455 is present.
2. Remove the snowshield to access the VMV vacuum supply line and examine it to determine if it has been damaged.
3. If the harness has been damaged, replace the engine vacuum harness with a new Harness (F75Z-9E498-CE). Refer to Figure 2 for correct harness routing.
4. Reinstall the snowshield. Clear DTCs and retest. If the condition persists, refer to the 1997 Powertrain Control/Emissions Diagnosis (PC/ED) Service Manual for additional diagnostics.
PART NUMBER PART NAME
F75Z-9E49S-CE Vacuum Harness
OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 97-10-9
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage And Emissions Warranty Coverage
OPERATION DESCRIPTION TIME
982325A Replace Vacuum Harness 0.3 Hr.
DEALER CODING
CONDITION
BASIC PART NO. CODE
9E498 43
OASIS CODES: 206000, 698298