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12.18 - Fuel Fail 18 : TPSensor and MAF Sensor ( Brett Gadzinsky,  )

High throttle position signal, low air flow signal : the ECU looks for a combination of high throttle signal and low air flow signal that can not occur in a normally operating system.

Conditions for flagging :

- Throttle position sensor 2.25 volts or greater,
- Engine load site 3 or lower (low maf sensor output)

Response time : 5 engine revolutions.

Default settings: ignore throttle position sensor.

Possible faults:

- High resistance connection to ECU or throttle position sensor,
- Restricted air intake,
- Restricted exhaust,
- Low fuel pressure (low engine power)
- Ignition fault (low engine power)
- Engine mechanical fault,
- Short or open circuit between ECU and maf sensor,
- Incorrectly adjusted throttle position sensor,
- Bad throttle position sensor,
- bad maf sensor.

Check tps output signal, maf sensor output signal, engine vacuum readings.


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