Terminals Of ECM

Fig 1: ECM Connector Terminal Identification - SFI System

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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.

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

1. WAVEFORM 1 
   Fig 2: Identifying Waveform 1

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   IGNITER SIGNAL (IGT AND IGF SIGNAL)
   
   

   ECM Terminal Name	CH1: Between IGT (1 to 4) and E1 CH2: Between IGF1 and E1
   Tester Range	5 V/DIV., 20 ms./DIV.
   Condition	Idling

   HINT: 

   The wavelength becomes shorter as the engine speed increases.

2. WAVEFORM 2 
   Fig 3: Identifying Waveform 2

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   CRANKSHAFT POSITION SENSOR SIGNAL AND CAMSHAFT POSITION SENSOR SIGNAL
   
   

   ECM Terminal Name	CH1: Between VV1+ and NE- CH2: Between NE+ and NE-
   Tester Range	5 V/DIV., 20 ms./DIV.
   Condition	Idling

   HINT: 

   The wavelength becomes shorter as the engine speed increases.

3. WAVEFORM 3 
   Fig 4: Identifying Waveform 3

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   NO. 1 (TO NO. 4) INJECTOR SIGNAL
   
   

   ECM Terminal Name	Between #10 (to #40) and E01
   Tester Range	20 V/DIV., 20 ms./DIV.
   Condition	Idling

   HINT: 

   The wavelength becomes shorter as the engine speed increases.

4. WAVEFORM 4 
   Fig 5: Identifying Waveform 4

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   AIR FUEL RATIO SENSOR HEATER SIGNAL
   
   

   ECM Terminal Name	Between HA1A and E04
   Tester Range	5 V/DIV., 10 ms./DIV.
   Condition	Idling with warm engine

   HINT: 

   The duty ratio varies depending on the engine driving condition.

5. WAVEFORM 5 
   Fig 6: Identifying Waveform 5

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   HEATED OXYGEN SENSOR SIGNAL
   
   

   ECM Terminal Name	Between OX1B and EX1B
   Tester Range	0.2 V/DIV., 200 ms./DIV.
   Condition	Engine speed maintained at 2500 RPM for 2 minutes after warming up sensor

   HINT: 

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

6. WAVEFORM 6 
   Fig 7: Identifying Waveform 6

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   KNOCK SENSOR SIGNAL
   
   

   ECM Terminal Name	Between KNK1 and EKNK
   Tester Range	1 V/DIV., 1 ms./DIV.
   Condition	Engine speed maintained at 4000 RPM after warming up engine

   HINT: 

   • The wavelength becomes shorter as the engine speed increases.
   • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
7. WAVEFORM 7 
   Fig 8: Identifying Waveform 7

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   VEHICLE SPEED SIGNAL
   
   

   ECM Terminal Name	Between SPD and E1
   Tester Range	5 V/DIV., 20 ms./DIV.
   Condition	Driving at 20 km/h (12 mph)

   HINT: 

   The wavelength becomes shorter as the vehicle speed increases.

8. WAVEFORM 8 
   Fig 9: Identifying Waveform 8

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   THROTTLE ACTUATOR POSITIVE TERMINAL SIGNAL
   
   

   ECM Terminal Name	Between M+ and ME01
   Tester Range	5 V/DIV., 1 ms./DIV.
   Condition	Idling with warm engine

   HINT: 

   The duty ratio varies depending on the throttle actuator operation.

9. WAVEFORM 9 
   Fig 10: Identifying Waveform 9

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   THROTTLE ACTUATOR NEGATIVE TERMINAL SIGNAL
   
   

   ECM Terminal Name	Between M- and ME01
   Tester Range	5 V/DIV., 1 ms./DIV.
   Condition	Idling with warm engine

   HINT: 

   The duty ratio varies depending on the throttle actuator operation.

10. WAVEFORM 10 
    Fig 11: Identifying Waveform 10

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    PURGE VSV SIGNAL
    
    

    ECM Terminal Name	Between PRG and E1
    Tester Range	10 V/DIV., 20 ms./DIV.
    Condition	Idling under purge control

    HINT: 

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

11. WAVEFORM 11 
    Fig 12: Identifying Waveform 11

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    CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY SIGNAL
    
    

    ECM Terminal Name	Between OC1+ and OC1-
    Tester Range	5 V/DIV., 1 ms./DIV.
    Condition	Idling

12. WAVEFORM 12 
    Fig 13: Identifying Waveform 12

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    CAN COMMUNICATION SIGNAL (REFERENCE)
    
    

    ECM Terminal Name	Between CANH and E1
    Tester Range	1 V/DIV., 10 μsec./DIV.
    Condition	Ignition switch ON

    HINT: 

    The waveform varies depending on the CAN communication signal.

13. WAVEFORM 13 
    Fig 14: Identifying Waveform 13

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    CAN COMMUNICATION SIGNAL (REFERENCE)
    
    

    ECM Terminal Name	Between CANL and E1
    Tester Range	1 V/DIV., 10 μsec./DIV.
    Condition	Ignition switch ON

    HINT: 

    The waveform varies depending on the CAN communication signal.

14. WAVEFORM 14 
    Fig 15: Identifying Waveform 14

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    ENGINE SPEED SIGNAL
    
    

    ECM Terminal Name	Between TACH and E1
    Tester Range	5 V/DIV., 10 ms./DIV.
    Condition	Idling

    HINT: 

    The wavelength becomes shorter as the engine speed increases.