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12.17 - Fuel Fail 17 : throttle position sensor out of range low by Brett Gazdzinsky
Conditions for flagging : signal to ecu under 250 millivolts for 64 milliseconds.
The throttle position sensor is used by the ecu for :
- Idle speed control,
- Ignition idle strategy selection,
- Overrun fuel cutoff,
- Idle fuel trim (1990 to 1992)
- Main fuel metering strategy,
- Main ignition strategy,
- Acceleration strategy,
- Deceleration leaning,
- Full load enrichment.
Default settings while FF17 is flagged is 1.5 volts, and all throttle position sensor functions do not operate.
Possible faults :
- High resistance at throttle position sensor or ECM,
- Short or open circuit in wire harness between tps and ecu,
- Loose or incorrectly adjusted throttle position sensor,
- Defective throttle position sensor (worn).
