(e) Check that the values indicated on the tester and on the combination meter are the same.
TPWS
OK:
Engine speed indicated on the tester and on the combination meter are the same.
NG -- INSPECT TIRE PRESSURE WARNING ECU (TACH SIGNAL)
OK -- USE SIMULATION METHOD TO CHECK See: Accessories and Optional Equipment/Antitheft and Alarm
Systems/Diagrams/Diagnostic Aids/How To Troubleshoot ECU Controlled Systems/How To Proceed With Troubleshooting
2. INSPECT TIRE PRESSURE WARNING ECU (TACH SIGNAL)
(a) Disconnect the F53 ECU connector.
(b) Start the engine.
(c) Check the waveform of the ECU connector using an oscilloscope while idling the engine.
OK:
Text in Illustration
Tool Setting
HINT
The wavelength becomes shorter as the engine speed increases.
NG -- CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU - ECM)
OK -- REPLACE TIRE PRESSURE WARNING ECU
