Terminals of ECM

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, and displayed in the "Specified Conditions" column. The illustration above can be used as a reference to identify the ECM terminal locations.

1. WAVEFORM 1

Fuel injector

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

2. WAVEFORM 2

(a) Igniter IGT signal (from ECM to igniter)

(b) Igniter IGF signal (from igniter to ECM)

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

3. WAVEFORM 3

(a) Camshaft position sensor

(b) Crankshaft position sensor

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

4. WAVEFORM 4

Throttle actuator positive terminal

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

5. WAVEFORM 5

Throttle actuator negative terminal

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

6. WAVEFORM 6

Throttle actuator negative terminal

HINT: In the Data List, item O2S B1S2 shows the ECM input values from the heated oxygen sensor.

7. WAVEFORM 7

Knock sensor

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