Engine Control System - SFI System

2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: TERMINALS OF ECM

TERMINALS OF ECM

1. CHECK ECM





(a) Measure the voltage of the ECM connector.
HINT: The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard normal voltage for that pair of terminals, displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.





















HINT: *: The ECM terminal voltage is constant regardless of the output voltage from the sensor.





(b) WAVEFORM 1










(c) WAVEFORM 2





HINT: In Data List, item O2S B1 S2 shows the ECM input values from the heated oxygen sensor.





(d) WAVEFORM 3





HINT: The wavelength becomes shorter as the engine rpm increases.





(e) WAVEFORM 4





- The wavelength becomes shorter as the engine rpm increases.
- The waveforms and amplitudes displayed differ slightly depending on the vehicle.





(f) WAVEFORM 5





HINT: The wavelength becomes shorter as the engine rpm increases.





(g) WAVEFORM 6





HINT: The wavelength becomes shorter as the engine rpm increases.





(h) WAVEFORM 7





HINT: If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.





(i) WAVEFORM 8





HINT: The wavelength becomes shorter as the vehicle speed increases.





(j) WAVEFORM 9





HINT: The duty ratio varies depending on the throttle actuator operation.





(k) WAVEFORM 10





HINT: The duty ratio varies depending on the throttle actuator operation.





(l) WAVEFORM 11





HINT: The wavelength becomes shorter as the engine rpm increases.





(m) WAVEFORM 12





HINT: The waveform varies depending on the CAN communication signal.





(n) WAVEFORM 13





HINT: The waveform varies depending on the CAN communication signal.





(o) WAVEFORM 14





HINT: A constant value is not output, as the duty ratio varies depending on the electrical load and battery condition.





(p) WAVEFORM 15





HINT: A constant value is not output, as the duty ratio varies depending on the electrical load and battery condition.





(q) WAVEFORM 16





HINT: A constant value is not output, as the duty ratio varies depending on the electrical load and battery condition.