TSB : DRIVEABILITY - Bi-Fuel - COMPUVALVE Pre-Replacement Check List - Service Tips (01-10-6)

Details

Publication date: 2001-05-28 Reference number: 01-10-6 DRIVEABILITY - BI-FUEL - COMPUVALVE PRE-REPLACEMENT CHECK LIST - SERVICE TIPS DRIVEABILITY - BI-FUEL - COMPUVALVE PRE-REPLACEMENT CHECK LIST - SERVICE TIPS TECHNICAL SERVICE BULLETIN Reference Number(s): 01-10-6, Date of Issue:  May 28, 2001 DRIVEABILITY - BI-FUEL - COMPUVALVE - PRE-REPLACEMENT CHECK LIST - SERVICE TIPS Model(s): FORD: 1996-2000 Contour 1994-2001 F-150, F-250 LD 1995-2001 E-250, E-350 1999-2001 Super Duty F Series Bulletin No.: 01-10-6 Date: May 28, 2001 ISSUE This article will be used as an aid in diagnosis to avoid unnecessary replacement of the compuvalve on bi-fuel vehicles after normal diagnosis has determined the compuvalve may be faulty. ACTION Complete the normal diagnostic methods and pinpoint tests. Should the conclusion be after normal diagnosis to replace the compuvalve, then follow the compuvalve Pre-Replacement Checklist (below) before replacing the compuvalve. SERVICE INFORMATION ALT - Alternate Fuel Mode FAP - Fuel Absolute Pressure HPS - High Pressure Solenoid VCL - Vehicle Communications Link AFCM - Alternate Fuel Control Module WDS - Worldwide Diagnostic System DTC - Diagnostic Trouble Code MAP - Manifold Absolute Pressure LPG - Liquid Propane Gas EEC - Electronic Engine Control NOTE: THE FOLLOWING IS A LIST OF KNOWN MIS-DIAGNOSIS OF THE COMPUVALVE REPLACEMENT ON BI-FUEL VEHICLES. MAP line loose. High FAP from vaporizer breakdown. Incorrect interpretation of DTCs. VCL replacement due to harness faults. Misfire due to leaking O-rings. Compuvalve replaced without checking HPS circuit for correct resistance. Low FAP due to lockoff fault. LPG fuel filter in backward. COMPUVALVE PRE-REPLACEMENT CHECKLIST Check communication ability with EEC, AFCM/compuvalve and VCL and compuvalve. Follow the Powertrain Control/Emissions Diagnosis (PC/ED) Workshop Manual procedures for the appropriate vehicle. Check MAP line. Follow normal diagnostic methods and visual checks. Check harness and connection integrity. Follow normal diagnostic methods, basic circuit checks and harness connections. Check current bi-fuel EEC calibration code. Refer to WDS. Check fuel gauge with fuel selector switch in ALT position for fuel level. Check power to compuvalve. Power to the compuvalve is indicated by the following fuel selector switch light status: On steady = OK, On then Off or Flashing (regular and irregular) indicated fault. Check that the arrow on the LPG fuel filter is pointing in the direction of fuel flow. Check base vehicle. Run vehicle in gas mode (e.g., borderline secondary ignition). Follow normal diagnostic methods. Check other applicable TSBs and special service messages. Verify ALT fuel switch status. Refer to Section 1 of the appropriate PC/ED Workshop Manual. WARRANTY INFORMATION WARRANTY STATUS: Information Only. OASIS CODES: 490000, 602300, 603300, 608000, 609000, 611000, 623000, 690000, 698298