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Test H: Fuel Control: Testing

WARNING: This page is about a different car, the 2002 Ford Pickup and 2002 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

  1. 1) Access PCM DTCs

    Place ALT fuel switch in GAS mode. Start engine and allow it to reach normal operating temperature. Connect scan tool to Data Link Connector (DLC). Using scan tool, access PCM and record KOEO, KOER and Continuous Memory PCM DTCs. If any PCM DTCs are present, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article and service DTCs as necessary. If no KOEO, KOER or Continuous Memory PCM DTCs are present, go to next step.
    2. NOTE: HO2S may be displayed as O2S on scan tool.

  2. 2) Access PCM PIDs
    Ensure engine is at normal operating temperature. Ensure scan tool is connected to DLC. Turn ignition on. Using scan tool, access PCM and select HO2S-11 or HO2S-21 PID from PID/DATA MONITOR & RECORD menu. Start engine and observe HO2S PIDs. HO2S PIDs should switch between zero and one volt at idle. If HO2S PIDs are within specification, go to next step. If HO2S PIDs are not within specification, go to HEATED OXYGEN SENSOR MONITOR under DIAGNOSTIC MONITORS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article and diagnose appropriate HO2S.
    3. NOTE: HO2S may be displayed as O2S on scan tool.

  3. 3) Access AFCM PIDs In GAS Mode
    Ensure engine is at normal operating temperature. Ensure ALT fuel switch is in GAS position. Using scan tool, access AFCM and select HO2S-11 or HO2S-21 PID from PID/DATA MONITOR & RECORD menu. Start engine in GAS mode and observe HO2S PID. HO2S PIDs should switch between zero and one volt at idle. If HO2S PIDs are not within specification, go to step  5). If HO2S PIDs are within specification, go to next step.

  4. 4) Access AFCM PIDs In ALT Fuel Mode

    Ensure engine is at normal operating temperature. Ensure ALT fuel switch is in ALT position. Using scan tool, access AFCM and select HO2S-11 or HO2S-21 PID from PID/DATA MONITOR & RECORD menu. Start engine in ALT mode and observe HO2S PID. HO2S PIDs should switch between zero and one volt at idle. If HO2S PIDs are not within specification, check for leaks around ALT fuel supply system and repair as necessary. Check for kinked or bent fuel lines or blockage in injector sleeves or rails. Repair as necessary. If HO2S PIDs are within specification, perform COMPUVALVE RESET  procedure under PROGRAMMING. If concern is still present, clear DTCs and retest system. If DTCs reset, perform COMPUVALVE CHECK  under QUICK TEST. If fault still exists, replace compuvalve.

  5. 5) Check HO2S Voltage Activity

    Turn ignition off. Disconnect in-line 10-pin harness connector C422. Place ALT fuel switch in GAS position. Start engine and allow to idle. Ensure engine is at normal operating temperature. Using DVOM, measure voltage between in-line harness connector C422F terminal "C" (Gray/Red wire), and terminals "A" (Gray/Light Blue wire) and "B" (Red/Black wire). See Figure. Compare voltage measurements to specification in HO2S SENSOR OPERATING VOLTAGE SPECIFICATIONS  table. If both voltages are within specification, go to next step. If either voltage is not within specification, go to step  7).
    6. CAUTION: Always disconnect bi-fuel relay module power supply 3-pin harness connector C495 before disconnecting or reconnecting compuvalve main harness connector C1294 to avoid damaging compuvalve or connectors. See Figure.

  6. 6) Check HO2S Circuits To Compuvalve
    Turn ignition off. Disconnect bi-fuel relay module power supply harness connector C495. Disconnect compuvalve harness connector C1294. Perform the following:
    • Using DVOM, measure resistance between chassis ground and in-line harness connector C422M terminals "A", "B" and "C". See Figure.
    • Using DVOM, measure resistance between in-line harness connector C422M terminal "A" and compuvalve harness connector C1294 terminal No. 30. See Figure and Figure .
    • Using DVOM, measure resistance between in-line harness connector C422M terminal "B" and compuvalve harness connector C1294 terminal No. 10. See Figure and Figure .
    • Using DVOM, measure resistance between in-line harness connector C422M terminal "C" and compuvalve harness connector C1294 terminal No. 21 and 32. See Figure and Figure .

    If all resistances are more than 10 k/ohms between in-line harness connector C422M and chassis ground, and are less than 5 ohms between connectors C422M and C1294, go to next step. If any resistance measurement is 10 k/ohms or less between connector C422M and chassis ground, or 5 ohms or more between connectors C422M and C1294, repair open or short to ground in affected circuit. See WIRING DIAGRAMS article.

    7. CAUTION: Always disconnect bi-fuel relay module power supply 3-pin harness connector C495 before disconnecting or reconnecting compuvalve main harness connector C1294 to avoid damaging compuvalve or connectors. See Figure.

  7. 7) Check HO2S Circuits To Sensors
    Ensure in-line harness connector C422 is disconnected. Disconnect in-line harness connectors C133, C139, C431 and C432. For connector location, see CONNECTOR LOCATIONS  under CONNECTOR IDENTIFICATION & LOCATION. Perform the following:
    • Using DVOM, measure resistance between chassis ground and in-line harness connector C422F terminals "A", "B" and "C". See Figure.
    • Using DVOM, measure resistance of Gray/Light Blue wire between in-line harness connector C422F terminal "A" and in-line harness connector C139M terminal No. 13. See Figure and Figure .
    • Using DVOM, measure resistance of Red/Black wire between in-line harness connector C422F terminal "B" and in-line harness connector C139M terminal No. 14. See Figure and Figure .
    • Using DVOM, measure resistance of Gray/Red wire between in-line harness connector C422F terminal "C" and in-line harness connector C133M terminal No. 18. See Figure and Figure .

    If all resistances are more than 10 k/ohms between connector C422F and chassis ground, and less than 5 ohms between connectors C133M, C139M and C422F, replace appropriate HO2S. If any resistance measurement is 10 k/ohms or less between connector C422F and chassis ground, or 5 ohms or more between connectors C133M, C139M and C422F, repair open or short to ground in affected circuit. See WIRING DIAGRAMS article.

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