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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Pinpoint Test KE: Idle Air Control (IAC) Valve Through Pinpoint Test Z: Intermittent - (Except Diesel & Hybrid) >> Pinpoint Test NB: Malfunction Indicator Lamp >> Test Procedure

Test Procedure

  1. NB1 OBSERVE THE MIL 

    Is the MIL never on? 

    Yes No
    GO to  NB4. GO to  NB2.
  2. NB2 MIL ALWAYS ON (NO DTCS PRESENT) 

    Does the vehicle start? 

    Yes No
    GO to  NB3. The concern is elsewhere. RETURN to SYMPTOM CHARTS for further direction.
  3. NB3 CHECK THE MIL CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Key in OFF position.
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      MIL Negative terminal

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  NB7. REPAIR the circuit.
    CLEAR the DTCs. REPEAT the self-test.
  4. NB4 MIL NEVER ON 

    Does the vehicle start? 

    Yes No
    GO to  NB5. The concern is elsewhere. RETURN to SYMPTOM CHARTS for further direction.
  5. NB5 MIL HARNESS CHECK 
    • Key in OFF position.
    • PCM connector disconnected.
    • Key ON, engine OFF.
    • Connect a 5 amp fused jumper wire between the following:
      Point A PCM Connector, Harness Side Point B
      MIL Ground
    • Remove the jumper wire(s).

    Does the MIL Illuminate when grounded? 

    Yes No
    GO to  NB7. GO to  NB6.
  6. NB6 CHECK FOR AN OPEN MIL CIRCUIT BETWEEN THE PCM AND INSTRUMENT CLUSTER 
    • Key in OFF position.
    • Disconnect the instrument cluster.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) Instrument Cluster Connector, Harness Side
      MIL MIL

    Is the resistance less than 5 ohms? 

    Yes No
    REFER to the appropriate INSTRUMENT CLUSTER article to diagnose the MIL and its circuitry. REPAIR the circuit.
    VERIFY the repair by turning the key ON, engine OFF.
    CLEAR the DTCs. REPEAT the self-test.
  7. NB7 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect all the PCM connectors and make sure they seat correctly.
    • Carry out the PCM self-test and verify the concern is still present.

    Is the concern still present? 

    Yes No
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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