Terminals Of ECM

Fig 1: Identifying ECM Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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.

1. WAVEFORM 1 
   Fig 2: Waveform 1 Graph - Camshaft Timing Oil Control Valve

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   Camshaft timing oil control valve (OCV) 

   OSCILLOSCOPE WAVEFORM REFERENCE 1
   
   

   ECM Terminal Names	Between OC1+ and OC1- or OC2+ and OC2-
   Tester Ranges	5 V/DIV, 1 msec/DIV
   Conditions	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

2. WAVEFORM 2 
   Fig 3: Waveform 2 Graph - Heated Oxygen Sensor

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   Heated oxygen sensor 

   OSCILLOSCOPE WAVEFORM REFERENCE 2
   
   

   ECM Terminal Names	Between OX1B and E2 or OX2B and E2
   Tester Ranges	0.2 V/DIV, 200 msec/DIV
   Conditions	Engine speed maintained 2,500 rpm for 2 minutes after warming up sensor

   HINT:

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

3. WAVEFORM 3 
   Fig 4: Waveform 3 Graph - Fuel Injector

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   Fuel injector 

   OSCILLOSCOPE WAVEFORM REFERENCE 3
   
   

   ECM Terminal Names	Between #10 (to 60) and E01
   Tester Ranges	30 V/DIV, 20 msec./DIV
   Conditions	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

4. WAVEFORM 4 
   Fig 5: Waveform 4 Graph - Knock Sensor

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   Knock sensor 

   OSCILLOSCOPE WAVEFORM REFERENCE 4
   
   

   ECM Terminal Names	Between KNK1 and EKNK or KNK2 and EKN2
   Tester Ranges	0.01 to 10 V/DIV, 0.01 to 10 msec./DIV
   Conditions	Maintain engine speed 4,000 rpm after warming up engine

   HINT:

   • The wavelength becomes shorter as the engine rpm increases.
   • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
5. WAVEFORM 5 
   1. VVT sensor
   2. Crankshaft position sensor
      Fig 6: Waveform 5 Graph

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      OSCILLOSCOPE WAVEFORM REFERENCE 5
      
      

      ECM Terminal Names	Between NE+ and NE- Between VV1+ and VV1- or VV2+ and VV2-
      Tester Ranges	2 V/DIV, 20 msec/DIV
      Conditions	Idling

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

6. WAVEFORM 6 
   1. Igniter IGT signal (from ECM to igniter)
   2. Igniter IGF signal (from igniter to ECM)
      Fig 7: Waveform 6 Graph

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      OSCILLOSCOPE WAVEFORM REFERENCE 6
      
      

      ECM Terminal Names	Between IGT (1 to 6) and E1 Between IGF1 and E1
      Tester Ranges	2 V/DIV, 20 msec/DIV
      Conditions	Idling

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

7. WAVEFORM 7 

   EVAP VSV 

   Fig 8: Waveform 7 Graph - EVAP VSV

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   OSCILLOSCOPE WAVEFORM REFERENCE 7
   
   

   ECM Terminal Names	Between PRG and E01
   Tester Ranges	5 V/DIV, 50 msec/DIV
   Conditions	Idling

   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 

   Fig 9: Waveform 8 Graph - Vehicle Speed Signal

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   OSCILLOSCOPE WAVEFORM REFERENCE 8
   
   

   ECM Terminal Names	Between SPD and E1
   Tester Ranges	5 V/DIV, 20 msec/DIV
   Conditions	Driving at 12 mph (20 km/h)

   HINT:

   The wavelength becomes shorter as the vehicle speed increases.

9. WAVEFORM 9 
   Fig 10: Waveform 9 Graph - Throttle Actuator Positive Terminal

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   Throttle actuator positive terminal 

   OSCILLOSCOPE WAVEFORM REFERENCE 9
   
   

   ECM Terminal Names	Between M+ and ME01
   Tester Ranges	5 V/DIV, 1 msec/DIV
   Conditions	Idling with warm engine

   HINT:

   The duty ratio varies depending on the throttle actuator operation.

10. WAVEFORM 10 
    Fig 11: Waveform 10 Graph - Throttle Actuator Negative Terminal

    Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    Throttle actuator negative terminal 

    OSCILLOSCOPE WAVEFORM REFERENCE 10
    
    

    ECM Terminal Names	Between M- and ME01
    Tester Ranges	5 V/DIV, 1 msec/DIV
    Conditions	Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

11. WAVEFORM 11 
    Fig 12: Waveform 11 Graph - Engine Speed Signal

    Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    Engine speed signal 

    OSCILLOSCOPE WAVEFORM REFERENCE 11
    
    

    ECM Terminal Names	Between TACH and E1
    Tester Ranges	5 V/DIV, 10 msec/DIV
    Conditions	Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

12. WAVEFORM 12 
    Fig 13: Waveform 12 Graph - Airbag Sensor Assembly

    Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    Airbag sensor assembly 

    OSCILLOSCOPE WAVEFORM REFERENCE 12
    
    

    ECM Terminal Names	Between F/PS and E1
    Tester Ranges	5 V/DIV, 500 msec/DIV
    Conditions	Idling with warm engine