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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 840 (Engine Controls - Pinpoint Tests - Diesel 6.0L (99P E-Series & 99P F450/550)) >> PINPOINT TEST AE: Unable to Activate Self-Test/Network Communication Error >> Test Procedure

Test Procedure

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  1. AE1 CARRY OUT A VEHICLE INSPECTION AND VERIFY THE SELF-TEST PROCEDURE 
    NOTE: The scan tool resets if battery voltage is less than 9.5 volts. If carrying out repeated self-tests, disable the glow plug control module (GPCM) and disregard the glow plug codes while the GPCM is disabled. If equipped with a power take-off (PTO) system, it must be disabled while carrying out the PCM self-tests.
    • Check the battery voltage. Refer to appropriate CHARGING SYSTEM article.
    • Verify that the correct procedure was used to activate the self-test for the scan tool. Refer to the DIAGNOSTIC METHODS article Diagnostic Methods.
    • Was the correct self-test procedure used? 
    Yes No
    GO to  AE2. REFER to the DIAGNOSTIC METHODS article Diagnostic Methods for the correct operating procedures.
  2. AE2 CARRY OUT THE NETWORK TEST 
    • Key ON, engine OFF.
    • Carry out the network test.
    • Do all modules indicate pass? 
    Yes No
    REFER toPINPOINT TEST QT . For only PCM indicates fail, GO to  AE3.
    For network test or all other modules indicates fail, REFER to appropriate MODULE COMMUNICATIONS NETWORK article to continue no response from the scan tool diagnosis.
  3. AE3 CHECK THE PCM VPWR CIRCUITS FOR VOLTAGE 
    • Key in OFF position.
    • PCM connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - )
      VPWR - Pin B34, B46 Ground
    • Are the voltages greater than 10.5 V? 
    Yes No
    GO to  AE4. refer to PINPOINT TEST A .
  4. AE4 CHECK THE PWRGND CIRCUITS FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - )
      PWRGND - Pin B10, B11, B23 Ground
    • Are the resistances less than 5 ohms? 
    Yes No
    GO to  AE5. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  5. AE5 CHECK THE VREF CIRCUITS FOR A SHORT TO GROUND 
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - )
      VREF - Pin B29, B45, E36 Ground
    • Are the resistances greater than 10K ohms? 
    Yes No
    REFER to appropriate MODULE COMMUNICATIONS NETWORK article to continue no communication with the PCM diagnosis. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
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