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 > Sfi System: Startability Malfunction (P1604)
DESCRIPTION This DTC is stored when the engine does not start even though the STA signal is input or when the engine takes a long time to start, and when the engine speed is low or the engine stalls just after the engine starts. Using the Techstream, the conditions present when the DTC was stored ca ...