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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4S >> Repair and Diagnosis >> External Pages >> Different car >> Section 1837 (Engine Controls Self-Diagnostics - EEC-V - CNG & Gasoline - System Tests A - FD) >> Test DQ: Barometric Pressure Sensor >> Diagnostic Aids

Diagnostic Aids

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NOTE: After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when directed by QUICK TEST. This system test is intended to diagnose:

NOTE: Proceed to DTC testing steps listed in FAULT CODE SETTING CONDITION  table of fault code setting condition.
FAULT CODE SETTING CONDITION

Fault Code KOEO KOER Continuous Memory
P0106  DQ1  DQ1  DQ1
P0107  DQ1  DQ1  DQ1
P0108  DQ1  DQ1  DQ1
P0109  DQ1  DQ1  DQ1

  1. 1) DTC P0106, P0107, P0108 Or P0109

    Obtain local barometric pressure measurement. Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to ON position. Using scan tool, select BARO PID from PID/DATA MONITOR & RECORD menu. Compare BARP PID readings with specifications in table. See BARO SENSOR SPECIFICATIONS  table. If BARO PID value is within specification, problem is not present at this time, go to TEST Z, step 1) . If BARO PID value is not within specification, go to next step.
    BARO SENSOR SPECIFICATIONS

    In. Hg (kPa) Frequency (Hz)
    17.1 (58) 122.4
    18.3 (62) 125.5
    19.5 (66) 128.7
    20.7 (70) 131.9
    21.8 (74) 135.1
    23.0 (78) 138.3
    24.2 (82) 141.8
    25.4 (86) 145.4
    26.6 (90) 148.9
    27.7 (94) 152.5
    28.9 (98) 156.1
    30.1 (102) 159.6
    31.0 (105) 162.4

  2. 2) Check BARO Signal & SIG RTN Circuits For Open

    Using a DVOM, measure resistance of BARO circuit between PCM harness connector terminal and BARO sensor harness connector terminal. See Fig 1. Using a DVOM, measure resistance of SIG RTN circuit between PCM harness connector terminal and BARO sensor harness connector terminal. If resistance in either measurement is 5 ohms or more, repair open circuit. If resistance in both measurements is less than 5 ohms, perform the following:
    • For DTC P0108, go to step  7).
    • All others, go to next step.
    Fig 1: Identifying BARO Sensor Circuits & Connector Terminals
    G99F02087Courtesy of FORD MOTOR CO.

  3. 3) Check VREF Voltage To BARO Sensor

    Disconnect BARO sensor connector. Using a DVOM, measure voltage between BARO sensor harness connector VREF and STG RTN terminals. See Fig 1. If voltage is 4-6 volts, go to step  5). If voltage is not 4-6 volts, go to next step.

  4. 4) Check VREF Circuit For Open

    Using a DVOM, measure resistance of VREF circuit between PCM harness connector terminal and BARO sensor harness connector terminal. See Fig 1. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open VREF circuit.

  5. 5) Check BARO Circuit For Short To Ground

    Ensure ignition switch is turned to OFF position. Disconnect PCM connector(s). Using a DVOM, measure resistance between PCM harness connector BARO and SIG RTN terminals. See Fig 1. Using a DVOM, measure resistance between PCM harness connector BARO terminal and negative battery terminal. If both resistance measurements are more than 10 k/ohms, go to next step. If either resistance measurement is 10 k/ohms or less, repair short in affected circuit.

  6. 6) Check VREF Circuit For Short To Ground

    Using a DVOM, measure resistance between PCM harness connector VREF and SIG RTN terminals. See Fig 1. Using a DVOM, measure resistance between PCM harness connector VREF terminal and negative battery terminal. If either resistance measurement is 10 k/ohms or less, repair short to ground in affected circuit. If both resistance measurements are more than 10 k/ohms, replace BARO sensor. If problem is still present, replace PCM.

  7. 7) DTC P0108: Induce Opposite Code

    Disconnect BARO sensor electrical connector. Turn ignition switch to ON position. Check for DTCs. If DTC P0107 is present, replace BARO sensor. If DTC P0107 is not present, go to next step.

  8. 8) Check BARO Signal Circuit For Short To Power

    Turn ignition switch to OFF position. Using a DVOM, measure resistance between PCM harness connector BARO and VPWR terminals. See Fig 1. If resistance measurement is more than 10 k/ohms, replace PCM. If resistance measurement is 10 k/ohms or less, repair short to VPWR in BARO circuit.
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