Terminals Of ECM

Fig 1: ECM B31 & A50 ECM Connector Terminal Identification

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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.

HINT: 

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

*2: TMC Made

*3: except TMC Made

1. WAVEFORM 1 
   Fig 2: Identifying Waveform 1

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   IGNITER IGT SIGNAL (FROM ECM TO IGNITER)
   
   

   ECM Terminal Name	Between IGT (1 to 4) and E1 Between IGF1 and E1
   Tester Range	2 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
   
   

   ECM Terminal Name	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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   CAMSHAFT POSITION SENSOR
   
   

   ECM Terminal Name	Between G2+ and G2- Between EV1+ and EV1-
   Tester Range	5 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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   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.

5. WAVEFORM 5 
   Fig 6: Identifying Waveform 5

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   AIR FUEL RATIO SENSOR (SENSOR 1) HEATER
   
   

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

   HINT: 

   The wavelength varies in accordance with the engine operating condition.

6. WAVEFORM 6 
   Fig 7: Identifying Waveform 6

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   HEATED OXYGEN SENSOR (SENSOR 2)
   
   

   ECM Terminal Name	Between OX1B and O1B-
   Tester Range	0.2 V/DIV. 200 ms/DIV
   Condition	Engine speed maintained at 2500 RPM for 2 minutes after warming up engine

   HINT: 

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

7. WAVEFORM 7 
   Fig 8: Identifying Waveform 7

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   KNOCK SENSOR
   
   

   ECM Terminal Name	Between KNK1 and EKNK
   Tester Range	1V/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 condition.
8. WAVEFORM 8 
   Fig 9: Identifying Waveform 8

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   VEHICLE SPEED SIGNAL
   
   

   ECM Terminal Name	Between SPD and E1
   Tester Range	5 V/DIV, 20 ms/DIV
   Condition	Rotate driving wheel slowly

   HINT: 

   The wavelength becomes shorter as the vehicle speed increases.

9. WAVEFORM 9 
   Fig 10: Identifying Waveform 9

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   THROTTLE ACTUATOR POSITIVE TERMINAL
   
   

   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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    THROTTLE ACTUATOR NEGATIVE TERMINAL
    
    

    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.

11. WAVEFORM 11 
    Fig 12: Identifying Waveform 11

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    PURGE VSV
    
    

    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.

12. WAVEFORM 12 
    Fig 13: Identifying Waveform 12

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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.

13. WAVEFORM 13 
    Fig 14: Identifying Waveform 13

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    CAMSHAFT TIMING OIL CONTROL VALVE (FOR INTAKE CAMSHAFT)
    
    

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

14. WAVEFORM 14 
    Fig 15: Identifying Waveform 14

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    CAN COMMUNICATION SIGNAL (REFERENCE)
    
    

    ECM Terminal Name	Between CANH and E1
    Tester Range	1 V/DIV, 10 μs/DIV
    Condition	Engine stopped and ignition switch to ON

    HINT: 

    The waveform varies depending on the CAN communication signal.

15. WAVEFORM 15 
    Fig 16: Identifying Waveform 15

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    CAN COMMUNICATION SIGNAL (REFERENCE)
    
    

    ECM Terminal Name	Between CANL and E1
    Tester Range	1 V/DIV, 10 μs/DIV
    Condition	Engine stopped and ignition switch to ON

    HINT: 

    The waveform varies depending on the CAN communication signal.

16. WAVEFORM 16 
    Fig 17: Identifying Waveform 16

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    CAMSHAFT TIMING OIL CONTROL VALVE (FOR EXHAUST CAMSHAFT)
    
    

    ECM Terminal Name	Between OE1+ and OE1-
    Tester Range	5 V/DIV, 1 ms/DIV
    Condition	Idling

17. WAVEFORM 17 
    Fig 18: Identifying Waveform 17

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    COOLING FAN CONTROL SIGNAL
    
    

    ECM Terminal Name	Between RFC and E1
    Tester Range	1 V/DIV, 2 ms/DIV
    Condition	Ignition switch to ON, A/C switch ON (Max Cool)

    HINT: 

    The wavelength becomes shorter as the engine coolant temperature.