LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 759 (Engine Controls - Pinpoint Tests - Bi-Fuel CNG) >> Pinpoint Tests Ad: No Start - Alt Fuel Switch Indicator Is On Steady >> Test Procedure

Test Procedure

WARNING: This page is about a different car, the 2004 Ford Pickup Heritage. However, it is still accessible from the selected car via links, so may be relevant.
  1. AD1 MONITOR THE FUEL RAIL PRESSURE AND FUEL TANK PRESSURE PIDS 
    NOTE: Verify the ALT fuel tank is filled.
    • Key off.
    • Connect the scan tool.
    • Place the ALT fuel switch in the ALT position.
    • Key on, engine off.
    • Access the AFCM.
    • Select the FRPREAB and TANKPR PIDS.

    Is The FRPREAB PID Greater Than 517 KPA (75 PSI) And The TANKPR PID Greater Than 1034 KPA (150 PSI)? 

    Yes No
    GO to  AD2. GO to Pinpoint Test AC .
  2. AD2 CHECK THE ALT FUEL INJECTOR VPWR CIRCUIT 
    • Key off.
      NOTE: Check at least one fuel injector on each bank.
    • Disconnect two ALT fuel injectors.
    • Key on, engine off.
    • Measure the voltage between the right bank ALT fuel injector VPWR circuit, harness side and ground; and between the left bank ALT fuel injector VPWR circuit, harness side and ground.

    Are The Voltages Greater Than 10 Volts? 

    Yes No
    GO to  AD3. REPAIR the circuit in question.
  3. AD3 CHECK THE ALT FUEL INJECTOR DRIVER CIRCUIT 
    NOTE: Check at least one fuel injector on each bank.
    • Connect a test lamp between the right bank ALT fuel injector VPWR circuit, harness side and the right bank ALT fuel injector driver circuit, harness side; and between the left bank ALT fuel injector VPWR circuit, harness side and the left bank ALT fuel injector driver circuit, harness side.
    • Crank the engine.

    Does The Test Lamp Blink Consistently And Brightly (One Blink Per Engine Revolution) For Each Bank? 

    Yes No
    The ALT fuel control system is functioning correctly.
    REFER to SYMPTOM CHARTS - BI-FUEL CNG to continue diagnosis.    		 GO to  AD4.
  4. AD4 CHECK FOR CORRECT AFCM OPERATION 
    • Disconnect the AFCM.
    • Check for:
      • corrosion
      • pushed out pins
    • Connect the AFCM connector and make sure it is seated correctly.
    • Operate the system and verify the concern is still present.

    Is The Concern Still Present? 

    Yes No
    INSTALL a new AFCM. The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
scientia non olet · About LEMON Manuals