TERMINALS OF ECU CHECK TIRE PRESSURE WARNING ECU AND RECEIVER (a) Disconnect the P21 tire pressure warning ECU and receiver connector and measure the voltage or resistance on the wire harness side. ![]()
(b) Connect the P21 tire pressure warning ECU and receiver connector. (c) Measure the voltage and resistance according to the value(s) in the table below. If the result is not as specified, the ECU may be malfunctioning. HINT: Measure the values on the wire harness side while the connector is connected. ![]()
(d) Using an oscilloscope, check waveform 1. ![]()
HINT: The waveform shown in the illustration is an example. If the tester displays a waveform that alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage, and where low is a voltage of between 0 and 1.2 V, the ECU can be judged normal. |
Toyota Tundra Service Manual > Vehicle Stability Control System: Precaution
PRECAUTION TROUBLESHOOTING PRECAUTION (a) When there is a malfunction with terminal contact points or part installation problems, removal and installation of the suspected parts may return the system to normal either completely or temporarily. (b) In order to determine the malfunctioning area, be su ...