Tech Tip: MAP / Air Pressure Sensor Fault (C13) and Replacement

[gsxbarmy]

The Intake Air Pressure (IAP) sensor detects the intake air pressure, which is then converted into voltage signal and sent to the ECM. The basic fuel injection time (volume) is determined according to the voltage signal (output voltage) which increases when the intake air pressure is high. Problems with the IAP Sensor are communicated by code C13 being displayed on the dashboard. Whilst the IAP Sensor can be tested, should it be faulty, it cannot be repaired and a replacement part should be fitted.

The attached document describes removal, testing and sourcing a replacement.

[Hooli]

It's worth nothing this is only used at low throttle/low revs, above certain points (not quoted in the manual) the ECU just uses the TPS/revs to calculate the volume of intake air. So running problems won't be apparent except when ridden slowly or at idle.

Also it's the same part as the ambient air pressure sensor on the side of the airbox so they can be swapped to confirm a faulty sensor.

[Eric GSX1400K3]

So does this mean that a faulty IAP sensor could also cause jerky throttle control at low rpm?

[Hooli]

I guess so, I'd suspect similar effects to split vacuum pipes at a guess.

The bike will run with the MAP sensor unplugged & just use the TPS/revs to calculate the fuelling, so that's an easy test for you. Of course if the vacuum pipes are damaged you'd probably get poor running still.