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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics - EEC-V (Bi-Fuel) >> System Tests (Bi-Fuel) >> Test UA: SCP Single Ended Circuit Failure >> Diagnostic Aids

Diagnostic Aids

Enter this test only when all steps under QUICK TEST have been successfully completed and engine still does not start or if directed here from another test or chart. This test is only intended to diagnose:

NOTE: During bi-fuel diagnostics, intermittent failures are possible. Perform wiggle test and tap lightly on relays during testing. Ensure LPG fuel level is correct before continuing with diagnostics. F-Series models use a compuvalve and Contour models use an Alternate Fuel Control Module (AFCM).

  1. 1) Check SCP Link To DLC For Open Or Short To Ground

    Ensure ignition switch is turned to OFF position. Disconnect compuvalve harness connector C4025 (on F-Series) or AFCM harness connector C4001 (on Contour), and PCM harness connector. Perform the following resistance tests:

    1. Contour (2.0L) Short To Ground Check

      Measure resistance between chassis ground and AFCM harness connector C4001 terminals No. 5 (Pink/Light Blue wire) and 6 (Tan/Orange wire). See Figure. If resistance is more than 10 k/ohms, go to  CONTOUR (2.0L) OPEN CIRCUIT CHECK. If resistance is 10 k/ohms or less, repair short to ground in affected circuit. See WIRING DIAGRAMS article.

    2. Contour (2.0L) Open Circuit Check

      Measure resistance between AFCM harness connector C4001 terminal No. 5 (Pink/Light Blue wire) and DLC terminal No. 10 (Blue wire). Also, measure resistance between AFCM harness connector C4001 terminal No. 6 (Tan/Orange wire) and DLC terminal No. 2 (Gray wire). See Figure and Figure . If both resistance measurements are less than 5 ohms, go to next step. If either resistance measurement is 5 ohms or more, repair open in affected circuit. See WIRING DIAGRAMS article.

    3. F-Series (5.4L & 6.8L) Short To Ground Check

      Measure resistance between chassis ground and compuvalve harness connector C4025 terminals No. 14 (White wire) and 16 (White wire). See Figure. If resistance is more than 10 k/ohms, go to  F-SERIES (5.4L & 6.8L) OPEN CIRCUIT CHECK. If resistance is 10 k/ohms or less, repair short to ground in affected circuit. See WIRING DIAGRAMS article.

    4. F-Series (5.4L & 6.8L) Open Circuit Check

      Measure resistance between compuvalve harness connector C4025 terminal No. 16 (White wire) and DLC terminal No. 10 (Pink/Light Blue wire). Also, measure resistance between compuvalve harness connector C4025 terminal No. 14 (White wire) and DLC terminal No. 2 (Tan/Orange wire). See Figure and Figure . If both resistance measurements are less than 5 ohms, go to next step. If either resistance measurement is 5 ohms or more, repair open in affected circuit. See WIRING DIAGRAMS article.

  2. 2) Check SCP Link To PCM For Open Or Short To Ground

    Ensure ignition switch is turned to OFF position. Ensure compuvalve harness connector C4025 (on F-Series) or AFCM harness connector C4001 (on Contour), and PCM are disconnected. Perform the following resistance tests:

    1. Contour (2.0L) Short To Ground Check

      Measure resistance between chassis ground and AFCM harness connector C4001 terminals No. 5 (Pink/Light Blue wire) and No. 6 (Tan/Orange wire). See Figure. If resistance is more than 10 k/ohms, go to  CONTOUR (2.0L) OPEN CIRCUIT CHECK. If resistance is 10 k/ohms or less, repair short to ground in affected circuit. See WIRING DIAGRAMS article.

    2. Contour (2.0L) Open Circuit Check

      Measure resistance between AFCM harness connector C4001 terminal No. 5 (Pink/Light Blue wire) and PCM harness connector terminal No. 15 (Blue wire). Also, measure resistance between AFCM harness connector C4001 terminal No. 6 (Tan/Orange wire) and PCM harness connector terminal No. 16 (Gray wire). See Figure and Figure . If both resistance measurements are less than 5 ohms, go to next step. If either resistance measurement is 5 ohms or more, repair open in affected circuit. See WIRING DIAGRAMS article.

    3. F-Series (5.4L & 6.8L) Short To Ground Check

      Measure resistance between chassis ground and compuvalve harness connector C4025 terminals No. 14 (White wire) and 16 (White wire). See Figure. If resistance is more than 10 k/ohms, go to  F-SERIES (5.4L & 6.8L) OPEN CIRCUIT CHECK. If resistance is 10 k/ohms or less, repair short to ground in affected circuit. See WIRING DIAGRAMS article.

    4. F-Series (5.4L & 6.8L) Open Circuit Check

      Measure resistance between compuvalve harness connector C4025 terminal No. 16 (White wire) and PCM harness connector terminal No. 15 (Pink/Light Blue wire). Also, measure resistance between compuvalve harness connector C4025 terminal No. 14 (White wire) and PCM harness connector terminal No. 16 (Tan/Orange wire). See Figure and Figure . If both resistance measurements are less than 5 ohms, go to next step. If either resistance measurement is 5 ohms or more, repair open in affected circuit. See WIRING DIAGRAMS article.

  3. 3) Check PCM Configuration

    Check PCM configuration. See POWERTRAIN CONTROL MODULE (PCM) . If PCM is configured correctly, replace AFCM (on Contour) or compuvalve (on F-Series). If PCM is not configured correctly, perform FLASH VEHICLE IDENTIFICATION (VID) BLOCK PROCEDURE  under POWERTRAIN CONTROL MODULE (PCM) under PROGRAMMING.
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