MIL ON - DTC $71 (Hex Code) Stored: Overview
NO: 14-1O-96 Rev.AGROUP: Fuel
DATE: Dec. 13, 1996
SUBJECT:
MIL Light Illumination DTC $71 - Evap. Purge
Flow Monitor Failure
NOTE:
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 14-10-96, DATED OCT. 4, 1996, WHICH SHOULD BE REMOVED FROM YOUR FILES. THE DIAGNOSIS AND PARTS REQUIRED SECTIONS HAVE BEEN REVISED AND ARE HIGHLIGHTED WITH **ASTERISKS**.
MODELS:
1994 - 1997 (BR) Ram Truck
NOTE:
THIS BULLETIN APPLIES TO VEHICLES WITH GASOLINE ENGINES BUILT PRIOR TO AUGUST 15, 1996 (MDH 08-15-XX).
SYMPTOM/CONDITION:
A MIL" light is illuminated, the vehicle operator may detect a fuel odor, or a rough engine idle may be experienced. For 1996 - 97 MY. vehicles, the "MIL light will be illuminated due to Diagnostic Trouble Code (HEX) $71 - Evap Purge Flow Monitor Failure". For all vehicles (1994 thru 97), the technician will find that the purge solenoid is stuck in the open position (constantly purging evaporative system vapors at idle and all other engine speeds).
DIAGNOSIS:
Using a DRB III, verify the presence of DTC $71 on 1996 and 1997 vehicles. **For all vehicles, disconnect the electrical connection and both vacuum lines to the purge solenoid. Determine if the purge solenoid is stuck in the open position by applying vacuum to the engine port of the solenoid. Perform the following Repair Procedures if the solenoid is stuck open and vacuum cannot be held.**
PARTS REQUIRED:
**1994 - 1995 Vehicles
1 04723550 Canister, Vapor Carbon (with a build date code of 1876, or later, heat stamped in to the bottom of the canister housing)
1 05227635 Bi-level Purge Solenoid
1 52127666 Rollover Valve
1 53032011 Harness Assembly**
**1996 Vehicles** Built Prior to 12/01/95:
1 04669475AB Duty Cycle Purge Solenoid
1 52127666 Rollover Valve
1 53030635 Vapor Harness
1 53030926 Canister, Vapor Carbon (with a build date code or 1876, or later, heat stamped in to the bottom of the canister housing)
**1996 - 1997 Vehicles** Built From 12/01/95 To 08/15/96:
1 04669475AB Duty Cycle Purge Solenoid
1 53030635 Vapor Harness
1 53030926 Canister, Vapor Carbon (with a build date code of 1876, or higher, heat stamped in to the bottom of the canister housing)
**NOTE:
1996 - 1997 VEHICLES INCORPORATE A DUTY CYCLE PURGE SYSTEM WHEREAS 1994 - 1995 VEHICLES UTILIZE A BI-LEVEL PURGE SYSTEM. PARTS CANNOT BE INTERCHANGED BETWEEN THE TWO SYSTEMS.**
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No:
1994 - 1996 Vehicles Built Prior to 12/01/95 (Includes Roll over valve)
25-01-55-96 1.8 Hrs.
1996 - 1997 Vehicles Built Between 12/01/95 & 8/15/96
25-01-55-97 0.8 Hrs.
FAILURE CODE: P8 - New Part