Pinout Values and Diagnostic Parameters

TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: TERMINALS OF ECU

1. CHECK TIRE PRESSURE WARNING ECU

HINT
Inspect the connectors from the back side while the connectors are connected.





(a) Disconnect the L10 tire pressure warning antenna and receiver connector.

(b) Measure the voltage according to the value(s) in the table below.





(c) Connect the L10 tire pressure warning antenna and receiver connector.

(d) Measure the voltage and resistance according to the value(s) in the table below. If the result is not as specified, the ECU may have a malfunction.





(e) Using an oscilloscope, check waveform 1.





Waveform 1





HINT
The wavelength becomes shorter as the vehicle speed increases.

(f) Using an oscilloscope, check waveform 2.





Waveform 2





HINT
The wavelength becomes shorter as the engine speed increases.