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TSB 14-10-96 Rev. A

MIL Light Illumination DTC $71 - Evap. Purge Flow Monitor Failure

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Date: Dec. 13,1996

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 M.Y. vehicles, the "MIL light will be illuminated due to Diagnostic Trouble Code (HEX) $71 - "Evap Purge Flow Monitor Failure". For all vehicles (I 994 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:

 
l 994 - 1995 Vehicles
    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:
    04669475AB Duty Cycle Purge Solenoid
  1 52127666 Rollover Valve
  1 53030635 Vapor Harness
  1 53030926 Canister, Vapor Carbon (with a build date code of 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:
    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.

Repair Procedure: 

This bulletin involves the replacement of the rollover valve, the purge solenoid, the vapor harness, and the vapor carbon canister.

1.    Disconnect the negative battery cable.

2.    Disconnect the evaporative system vapor purge line from the engine throttle body.

3.    Disconnect the electrical connection and all lines to the purge solenoid. Remove and discard the purge solenoid.

4.    Disconnect all lines to the vapor canister and remove the vapor canister.

5.    Disconnect the vapor line from the vehicle fuel tank rollover valve.

6.    With compressed air, thoroughly clean all evaporative system lines including, the throttle body-to-purge solenoid line, the purge solenoid-to-vapor carbon canister line, the vapor carbon canister-to-rollover valve line, and the canister-to- atmosphere line.

NOTE- THE EVAPORATIVE SYSTEM MUST BE FREE OF ALL LOOSE CARBON PARTICLES, OTHERWISE THE PURGE SOLENOID MAY AGAIN BECOME STUCK IN THE OPEN POSITION. MAKE SURE NO DIRT ENTERS THE LINES.

7.    Inspect the throttle body port. Insert a thin wire into the throttle body evaporative purge port to make sure that there are no restrictions (carbon particles) present.

8.    Connect the evaporative system purge line to the throttle body.

9.    Replace the vapor harness. Be careful not to introduce dirt into the evaporative system.

10.  Install the new purge solenoid including both lines and electrical connection.

NOTE: THE 1996 -1997 DUTY CYCLE PURGE SOLENOID HAS MARKINGS ON ITS HOUSING WHICH DENOTE CORRECT ORIENTATION. MAKE SURE IT IS POSITIONED RIGHT SIDE UP.

11.  Install the vapor carbon canister to its bracket. Rotate the canister until the line fittings are in a horizontal position. Tighten the vapor carbon canister bracket bolt to 10 Nm (95 in. lbs.).

NOTE: THE BUILD DATE CODE ON THE BOTTOM OF THE VAPOR CARBON CANISTER MUST BE 1876 OR LATER. THE "187" = 187th JULIAN DAY OF AND THE "6" = 1996.

12.  Replace the vehicle rollover valve on vehicles built prior to 12101/95 (MDH 12-01- XX). The 52127666 rollover valve housing will be black in color with a small white cap on the top.

13.  Connect the evaporative system vapor line to the rollover valve.

14.  If the "Check Engine" lamp is on due to DTC $71, record Freeze Frame Data and erase the fault code.

Notes: 

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 12101/95 & 8115196
           25-01-55-97 ............................................... 0.8 Hrs.

Failure Code:    P8 - New Part

 


Thanks to Bob Bergevin and Barry Drodge for supplying this TSB information

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This page was edited on: May 3, 2004