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idel control system

Renegade

Well-Known Member
Ford wont replace just it, they replace the whole throttle body assembly. so idk if they just sell the motor
 

wickedstangs

Chula Vista, CA
Staff member
Administrator
P0171 - System Too Lean (Bank 1)
Description: The adaptive fuel stratedgy continuously monitors the fuel delivery hardware. The test fails when the adaptive fuel tables reah a rich calibrated limit.

Possible Causes:
Fuel System
  • Damaged or leaking fuel pulse damper
  • Fuel filter plugged or dirty
  • Damaged or worn fuel pump
  • leaking fuel pump check valve
  • leaking/contaminated fuel injectors
  • low fuel pressure or running out of fuel
  • Evaporative emission (EVAP) canister purge valve is leaking when the canister is clean
  • Fuel supply line restricted
  • Fuel rail pressure sensor bias
Exhaust System:

  • Exhaust leaks in the exhaust manifold gasket or mating gaskets before or near the heated oxygen sensor (HO2S)
EGR System:
  • Vacuum hose disconnected on exhaust gas recirculation (EGR) system module (ESM) applications
  • EGR valve tube/gasket leak
  • EGR vacuum regulator solenoid leak
Intake Air System:
  • Air leaks after the mass air flow (MAF) sensor
  • Vacuum leaks
  • Positive crankcase ventilation (PCV) system is leaking or the valve is stuck open
  • Damaged or contaminated MAF sensor
Secondary Air injection:
  • Damaged secondary air injection system or a mechanically stuck valve
Use your Predator to datalog your LONGFT1 and LONGFT2 PID's

Using the LONGFT1 and LONGFT2 (Dual Bank Engines) PIDs
The LONGFT1/2 PIDs are useful for diagnosing fuel trim concerns. A negative PID value indicates that fuel is being reduced to compensate for a rich condition. A positive PID value indicates that fuel is being increased to compensate for a lean condition. It is important to know that there is a separate LONGFT value that is used for each RPM/load point of engine operation. When viewing the LONGFT1/2 PIDs, the values may change a great deal as the engine is operating at different RPM and load points. This is because the fuel system may have learned corrections for fuel delivery concerns that can change as a function of engine RPM and load. The LONGFT1/2 PIDs display the fuel trim currently being used at that RPM and load point.

Observing the changes in LONGFT1/2 can help when diagnosing fuel system concerns. For example:
  • A contaminated mass air flow (MAF) sensor results in matching LONGFT1/2 correction values that are negative at idle (reducing fuel), but positive (adding fuel) at higher RPM and loads.
  • LONGFT1 values that differ greatly from LONGFT2 values rule out concerns that are common for both banks (for example, fuel pressure concerns, MAF sensor, etc. can be ruled out).
  • Vacuum leaks result in large rich corrections (positive LONGFT1/2 value) at idle, but little or no correction at higher RPM and loads.
  • A plugged fuel filter results in no correction at idle, but large rich corrections (positive LONGFT1/2 value) at high RPM and load.
 

wickedstangs

Chula Vista, CA
Staff member
Administrator
P1000 - On-Board Diagnostic (OBD) Systems Readiness Test Not Complete

Description: The OBD monitors are carried out during the OBD drive cycle. DTC P1000 is stored in continuous memory if any of the OBD monitors do not carry out their full diagnostic check.

Possible Causes:
  • The vehicle is new from the factory
  • Battery or powertrain control module (PCM) had recently been disconnected
  • An OBD monitor concern occurred before completion of an OBD drive cycle
  • PCM DTCs have recently been cleared with a scan tool
  • Power take off (PTO) circuit concern or PTO is on during testing.
DTC P1000 does not need to be cleared from the PCM except to pan inpection/maintenance test. The malfunction indicator lamp (MIL) flashes after a period of time with the key in the RUN position (engine not running)
 
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