Terminals Of ECM [12/2019 - 10/2022]

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HINT: 

The standard voltage, resistance and waveform between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals is also indicated. The result of checks should be compared with the standard voltage, resistance and waveform for each pair of the terminals as displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.

*1: w/ Stop and Start System

*2: w/o Stop and Start System

*3: w/ Voltage Inverter

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

1. WAVEFORM 1 

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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, ignition switch ON

   HINT: 

   The waveform varies depending on the CAN communication signal.

2. WAVEFORM 2 

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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, ignition switch ON

   HINT: 

   The waveform varies depending on the CAN communication signal.

3. WAVEFORM 3 

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   ENGINE SPEED SIGNAL
   
   

   ECM Terminal Name	Between NEO and E1
   Tester Range	1 V/DIV., 2 ms./DIV.
   Condition	Idling with warm engine

   HINT: 

   The wavelength becomes shorter as the engine speed increases.

4. WAVEFORM 4 

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   VEHICLE SPEED SIGNAL
   
   

   ECM Terminal Name	Between SPD and E1
   Tester Range	2 V/DIV., 20 ms./DIV.
   Condition	Driving at 20 km/h (12 mph)

   HINT: 

   The wavelength becomes shorter as the vehicle speed increases.

5. WAVEFORM 5 

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   CAM TIMING OIL CONTROL SOLENOID ASSEMBLY (FOR EXHAUST CAMSHAFT) SIGNAL
   
   

   ECM Terminal Name	Between OE1+ and OE1- Between OE2+ and OE2-
   Tester Range	5 V/DIV., 1 ms./DIV.
   Condition	Idling

6. WAVEFORM 6 

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   CAM TIMING OIL CONTROL SOLENOID ASSEMBLY (FOR INTAKE CAMSHAFT) SIGNAL
   
   

   ECM Terminal Name	Between OC1+ and OC1- Between OC2+ and OC2-
   Tester Range	5 V/DIV., 1 ms./DIV.
   Condition	Idling

7. WAVEFORM 7 

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   AIR FUEL RATIO SENSOR HEATER OPERATION SIGNAL
   
   

   ECM Terminal Name	Between HA1A and E04 Between HA2A and E05
   Tester Range	5 V/DIV., 10 ms./DIV.
   Condition	Idling

8. WAVEFORM 8 

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   IGNITION COIL ASSEMBLY SIGNAL (IGT SIGNAL)
   
   

   ECM Terminal Name	CH1: Between IGT (1 to 6) and E1
   Tester Range	2 V/DIV., 20 ms./DIV.
   Condition	Idling with warm engine

9. WAVEFORM 9 

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   NO. 1 (TO NO. 6) FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION) SIGNAL
   
   

   ECM Terminal Name	Between #10 (to #60) and E01
   Tester Range	20 V/DIV., 20 ms./DIV.
   Condition	Idling with warm engine, Data List item "Injection Mode" displaying "Port"

   HINT: 

   • The wavelength becomes shorter as the engine speed increases.
   • When the port injection injectors are operating, Port is displayed for Injection Way of the Data List.
10. WAVEFORM 10 

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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.

11. WAVEFORM 11 

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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.

12. WAVEFORM 12 

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    PURGE VSV OPERATION SIGNAL
    
    

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

    HINT: 

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

13. WAVEFORM 13 

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    KNOCK CONTROL SENSOR SIGNAL
    
    

    ECM Terminal Name	Between KNK1 and EKNK Between KNK2 and EKN2
    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 will differ slightly depending on the vehicle.
14. WAVEFORM 14 

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    HEATED OXYGEN SENSOR SIGNAL
    
    

    ECM Terminal Name	Between OX1B and EX1B Between OX2B and EX2B
    Tester Range	0.2 V/DIV., 200 ms./DIV.
    Condition	Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

    HINT: 

    Data List, item "O2 Sensor Voltage B1S2" and "O2 Sensor Voltage B2S2" shows the ECM values from the heated oxygen sensor.

15. WAVEFORM 15 

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    MASS AIR FLOW METER SUB-ASSEMBLY SIGNAL
    
    

    ECM Terminal Name	Between VG and E2G
    Tester Range	1 V/DIV., 100 μs./DIV.
    Condition	Ignition switch ON

16. WAVEFORM 16 

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    CRANKSHAFT POSITION SENSOR SIGNAL
    
    

    ECM Terminal Name	Between NE+ and NE-
    Tester Range	2 V/DIV., 20 ms./DIV.
    Condition	Idling with warm engine

    HINT: 

    The wavelength becomes shorter as the engine speed increases.

17. WAVEFORM 17 

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    VVT SENSOR (FOR INTAKE CAMSHAFT) SIGNAL
    
    

    ECM Terminal Name	CH1: Between VV1+ and VV1- CH2: Between VV2+ and VV2-
    Tester Range	5 V/DIV., 20 ms./DIV.
    Condition	Idling

    HINT: 

    The wavelength becomes shorter as the engine speed increases.

18. WAVEFORM 18 

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    VVT SENSOR (FOR EXHAUST CAMSHAFT) SIGNAL
    
    

    ECM Terminal Name	CH1: Between EV1+ and VV1- CH2: Between EV2+ and VV2-
    Tester Range	5 V/DIV., 20 ms./DIV.
    Condition	Idling

    HINT: 

    The wavelength becomes shorter as the engine speed increases.

19. WAVEFORM 19 

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    COOLING FAN CONTROL SIGNAL
    
    

    ECM Terminal Name	Between RFC and E1
    Tester Range	1 V/DIV., 20 ms./DIV.
    Condition	Ignition switch ON, A/C switch on (max cool)

    HINT: 

    The duty ratio varies depending on the engine coolant temperature.