Engine Control System - SFI System

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

TERMINALS OF ECM




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













HINT:
*1: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
*2: Automatic transaxle only
*3: PZEV only






1. WAVEFORM 1

Camshaft timing oil control valve (OCV):










2. WAVEFORM 2

Heated oxygen sensor:





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





3. WAVEFORM 3

Injector No. 1 (to No. 4) injection signal:





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





4. WAVEFORM 4

Knock sensor:





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





5. WAVEFORM 5

Crankshaft position sensor and Camshaft position sensor:





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





6. WAVEFORM 6

Igniter IGT signal (from ECM to igniter) and Igniter IGF signal (from
igniter to ECM):





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





7. WAVEFORM 7

Purge VSV:





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





8. WAVEFORM 8

Vehicle speed signal:





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





9. WAVEFORM 9

Throttle actuator positive terminal:





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





10. WAVEFORM 10

Throttle actuator negative terminal:





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





11. WAVEFORM 11

Engine speed signal:





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





12. WAVEFORM 12

CAN communication signal:





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





13. WAVEFORM 13

CAN communication signal:





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