Terminals of ECM

1. SFI SYSTEM

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 check results should be compared with the standard normal voltage for that pair of terminals, listed in the "Specified Condition" column.

The illustration above can be used as a reference to identify the ECM terminal locations.

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

1. 1
   WAVEFORM 1
2. 2
   Camshaft Timing Oil Control Valve (OCV) operation signal

   

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

1. 1
   WAVEFORM 2
2. 2
   Heated oxygen sensor signal

   

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

1. 1
   WAVEFORM 3
2. 2
   Fuel injector operation signal

   

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

1. 1
   WAVEFORM 4
2. 2
   Knock sensor signal

   

HINT:

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

1. 1
   WAVEFORM 5
2. 2
   Variable Valve Timing (VVT) sensor signal (1)
3. 3
   Crankshaft position sensor signal (2)

   

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

1. 1
   WAVEFORM 6
2. 2
   Igniter IGT signal (from ECM to igniter) (1)
3. 3
   Igniter IGF signal (from igniter to ECM) (2)

   

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

1. 1
   WAVEFORM 7
2. 2
   Purge VSV for EVAP system operation signal

   

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

1. 1
   WAVEFORM 8
2. 2
   Vehicle speed signal

   

HINT:

• The wavelength becomes shorter as the vehicle speed increases.
• Depending on the vehicle, the output waveform voltage may rise to 12 V if influenced by optionally installed systems.

1. 1
   WAVEFORM 9
2. 2
   Throttle drive motor operation signal (positive terminal)

   

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

1. 1
   WAVEFORM 10
2. 2
   Throttle drive motor operation signal (negative terminal)

   

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

1. 1
   WAVEFORM 11
2. 2
   Engine speed signal

   

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