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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 831 (Engine Controls - Symptom Charts (Except Diesel & Hybrid)) >> Step 3: No Diagnostic Trouble Codes (DTCs) Present Symptom Charts >> Chart 5

Chart 5

WARNING: This page does not describe the selected car, but rather 29 other vehicles, including the 2007 Mercury Mountaineer, 2007 Mercury Monterey, 2007 Mercury Montego, 2007 Mercury Milan, and 2007 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If the vehicle runs normally with the key in the OFF position, check for a damaged ignition switch, an IGN RUN circuit short to voltage, or a VPWR circuit short to voltage. Refer to the applicable SYSTEM WIRING DIAGRAMS article or service information article.
SYSTEM/COMPONENT REFERENCE (Pinpoint Test unless noted)
  1. Base Engine
  2. Check for air leaks, including proper sealing of intake manifold and components/vacuum lines attached to intake air (such as the PCV, EGR or IAC valve/vacuum lines).
  1. Visual. REFER to the appropriate ENGINE article.
  1. Verify the engine operates at normal temperature.
  1. Visual. REFER to the appropriate ENGINE COOLING article or Step 2: No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index , to diagnose any cooling system concerns that are present.
  1. Fast idle concerns (for vehicles equipped with an IAC valve)
  2. With the key ON, engine OFF monitor the TP MODE PID while wiggling the TP sensor circuits. The TP MODE PID can also be monitored during vehicle drive. With the throttle closed, the TP MODE PID must be C/T (closed throttle).
  1. TP MODE PID is not C/T with the throttle closed:
  2. At vehicle start, the TPREL begins at about 1.25 volts and counts down to the lowest TP voltage value seen since engine start. If the TP voltage value goes below the normal range, then increases again, TPREL sets to the lower voltage. If the TP voltage is about 0.04 volt greater than the TPREL value at closed throttle, the PCM goes into part throttle mode.
  3. MONITOR the TP voltage and TPREL PIDs for sudden changes while checking for intermittent TP circuit/connector concerns. CHECK for loose or worn throttle plates. If no concern is found, refer to PINPOINT TEST Z - Intermittent .
  1. Intake Air System Leaks (for vehicles equipped with an IAC valve)
  1. refer to PINPOINT TEST HU - Intake Air Systems .
  1. Additional Testing
  1. refer to PINPOINT TEST Z - Intermittent .
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