B4000 SE Regular Cab 4WD V6-4.0L OHV (1999)
PROM - Programmable Read Only Memory: Customer Interest
PCM - Delayed Idle Return/MIL ON/DTC P0320 Set
Bulletin No.: 002/99
Issued: 02/16/99
Revised
Applicable Model/s
1998-99 B-Series
Subject
DELAYED RETURN TO IDLE AND/OR MIL "ON"
DTC P0320
APPLICABLE MODEL(S)/VINS
All 1998-99 B-2500 with manual transmission (3.73 axle ratio only).
DESCRIPTION
Some vehicles may exhibit a delay at 1300-2000 engine rpms before returning to normal idle. The condition occurs on closed throttle deceleration in
neutral or with the clutch depressed. There may also be illumination of the Malfunction Indicator Lamp (MIL) and Diagnostic Trouble Code (DTC)
P0320 may be stored in memory. These conditions may be caused by the Powertrain Control Module (PCM).
Customers having this concern should have their vehicle repaired using the following procedure.
Note
^
This modification will only correct this specific condition.
Warning
^
This modification is authorized only for the listed engine(s). Performing this modification on other engine calibrations is unauthorized and could
create liability under applicable federal or local laws.
REPAIR PROCEDURE
Note
^
This modification should only be performed if all other components related to idle control have been verified to be working properly. (See
diagnostic index in section 01 of Workshop Manual)
1.
Verify customer complaint.