Terminals Of ECM [12/2019 - 10/2021]

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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. WAVEFORM 1 

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   CAN COMMUNICATION SIGNAL (REFERENCE)
   
   

   ECM Terminal Name	Between CANH and E1 Between CAN+ 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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   FUEL VAPOR-CONTAINMENT VALVE OPERATION SIGNAL
   
   

   ECM Terminal Name	CH1: Between CCA+ and E1 CH2: Between CCA- and E1
   	CH1: Between CCB+ and E1 CH2: Between CCB- and E1
   Tester Range	5 V/DIV., 5 μs./DIV.
   Condition	Ignition switch ON

   HINT: 

   When the fuel vapor-containment valve is operating, a waveform is produced at each terminal.

3. WAVEFORM 3 

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   CRANKSHAFT REVOLUTION SIGNAL FROM ECM TO INVERTER WITH CONVERTER ASSEMBLY
   
   

   ECM Terminal Name	Between NEO and E1
   Tester Range	5 V/DIV., 20 ms./DIV.
   Condition	Idling with warm engine

   HINT: 

   The wavelength becomes shorter as the engine speed increases.

4. WAVEFORM 4 

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   CAN COMMUNICATION SIGNAL (REFERENCE)
   
   

   ECM Terminal Name	Between CANL and E1 Between CAN- 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.

5. WAVEFORM 5 

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   CAMSHAFT REVOLUTION SIGNAL FROM ECM TO INVERTER WITH CONVERTER ASSEMBLY
   
   

   ECM Terminal Name	Between G2O and E1
   Tester Range	5 V/DIV., 20 ms./DIV.
   Condition	Idling with warm engine

   HINT: 

   The wavelength becomes shorter as the engine speed increases.

6. WAVEFORM 6 

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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 ON, A/C switch on (max cool)

   HINT: 

   The duty ratio varies depending on the engine coolant temperature.

7. WAVEFORM 7 

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   FUEL LID OPERATION SIGNAL FOR COMBINATION METER ASSEMBLY
   
   

   ECM Terminal Name	Between LSTM and E1
   Tester Range	5 V/DIV., 20 ms./DIV.
   Condition	Multi-information display displaying "Close Fuel Lid"

8. WAVEFORM 8 

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   FUEL LID OPERATION SIGNAL FOR COMBINATION METER ASSEMBLY
   
   

   ECM Terminal Name	Between LSTM and E1
   Tester Range	5 V/DIV., 20 ms./DIV.
   Condition	Multi-information display displaying "Ready to Refuel"

9. WAVEFORM 9 

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   THROTTLE ACTUATOR OPERATION SIGNAL (NEGATIVE TERMINAL)
   
   

   ECM Terminal Name	Between M- and E1
   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 

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    THROTTLE ACTUATOR OPERATION SIGNAL (POSITIVE TERMINAL)
    
    

    ECM Terminal Name	Between M+ and E1
    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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    EGR VALVE ASSEMBLY OPERATION SIGNAL
    
    

    ECM Terminal Name	CH1: Between EGA+ and E1 CH2: Between EGA- and E1
    	CH1: Between EGB+ and E1 CH2: Between EGB- and E1
    Tester Range	5 V/DIV., 5 μs./DIV.
    Condition	Idling with warm engine

    HINT: 

    When the EGR valve assembly is operating, a waveform is produced at each terminal.

12. WAVEFORM 12 

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    AIR FUEL RATIO SENSOR (SENSOR 2) HEATER OPERATION SIGNAL
    
    

    ECM Terminal Name	Between HA1B and E1
    Tester Range	5 V/DIV., 10 ms./DIV.
    Condition	Idling with cold engine

13. WAVEFORM 13 

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    AIR FUEL RATIO SENSOR (SENSOR 1) HEATER OPERATION SIGNAL
    
    

    ECM Terminal Name	Between HA1A and E1
    Tester Range	5 V/DIV., 10 ms./DIV.
    Condition	Idling with cold engine

14. WAVEFORM 14 

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    NO. 1 (TO NO. 4) DIRECT FUEL INJECTOR ASSEMBLY SIGNAL
    
    

    ECM Terminal Name	CH1: Between #1D+ and E1 CH2: Between #1D- and E1
    	CH1: Between #2D+ and E1 CH2: Between #2D- and E1
    	CH1: Between #3D+ and E1 CH2: Between #3D- and E1
    	CH1: Between #4D+ and E1 CH2: Between #4D- and E1
    Tester Range	50 V/DIV., 200 μs./DIV.
    Condition	Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

15. WAVEFORM 15 

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    FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE) SIGNAL
    
    

    ECM Terminal Name	CH1: Between FP1+ and E1 CH2: Between FP1- and E1
    Tester Range	20 V/DIV., 500 μs./DIV.
    Condition	Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

16. WAVEFORM 16 

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    OIL PRESSURE CONTROL VALVE OPERATION SIGNAL
    
    

    ECM Terminal Name	CH1: Between VOP+ and E1 CH2: Between VOP- and E1
    Tester Range	5 V/DIV., 20 ms./DIV.
    Condition	Idling with warm engine

17. WAVEFORM 17 

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    CAM TIMING OIL CONTROL SOLENOID ASSEMBLY OPERATION SIGNAL
    
    

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

18. WAVEFORM 18 
    CAM TIMING CONTROL MOTOR WITH EDU ASSEMBLY SIGNAL (EDT SIGNAL)
    
    

    ECM Terminal Name	Between EDT1 and E1
    Tester Range	1 V/DIV., 5 ms./DIV.
    Condition	Idling with warm engine

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19. WAVEFORM 19 

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    IGNITION COIL ASSEMBLY SIGNAL (IGT SIGNAL)
    
    

    ECM Terminal Name	Between IGT (1 to 4) and E1
    Tester Range	5 V/DIV., 20 ms./DIV.
    Condition	Idling with warm engine

    HINT: 

    The wavelength becomes shorter as the engine speed increases.

20. WAVEFORM 20 

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    WATER INLET HOUSING WITH WATER PUMP SUB-ASSEMBLY SIGNAL (FROM ECM TO WATER INLET HOUSING WITH WATER PUMP SUB-ASSEMBLY)
    
    

    ECM Terminal Name	Between WPO and E1
    Tester Range	5 V/DIV., 20 ms./DIV.
    Condition	Idling with warm engine

    HINT: 

    The duty ratio varies depending on the water inlet housing with water pump sub-assembly speed.

21. WAVEFORM 21 

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    WATER INLET HOUSING WITH WATER PUMP SUB-ASSEMBLY SIGNAL (FROM WATER INLET HOUSING WITH WATER PUMP SUB-ASSEMBLY TO ECM)
    
    

    ECM Terminal Name	Between WPI and E1
    Tester Range	5 V/DIV., 20 ms./DIV.
    Condition	Idling with warm engine

    HINT: 

    The wavelength becomes shorter as the water inlet housing with water pump sub-assembly speed increases.

22. WAVEFORM 22 

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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 with warm engine, under purge control

    HINT: 

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

23. WAVEFORM 23 
    CAM TIMING CONTROL MOTOR WITH EDU ASSEMBLY SIGNAL (EMR SIGNAL)
    
    

    ECM Terminal Name	Between EMR1 and E1
    Tester Range	2 V/DIV., 5 ms./DIV.
    Condition	Idling with warm engine

    HINT: 

    The wavelength becomes shorter as the engine speed increases.

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24. WAVEFORM 24 
    CAM TIMING CONTROL MOTOR WITH EDU ASSEMBLY SIGNAL (EMD SIGNAL)
    
    

    ECM Terminal Name	Between EMD1 and E1
    Tester Range	2 V/DIV., 100 ms./DIV.
    Condition	Idling with warm engine

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25. WAVEFORM 25 

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    NO. 1 (TO NO. 4) PORT FUEL INJECTOR ASSEMBLY SIGNAL
    
    

    ECM Terminal Name	Between #10 (to #40) and E1
    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 Mode of the Data List.
26. WAVEFORM 26 

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    CAMSHAFT POSITION SENSOR SIGNAL
    
    

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

    HINT: 

    The wavelength becomes shorter as the engine speed increases.

27. WAVEFORM 27 

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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.

28. WAVEFORM 28 

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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

29. WAVEFORM 29 

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    KNOCK CONTROL SENSOR SIGNAL
    
    

    ECM Terminal Name	Between KNK1 and EKNK
    Tester Range	1 V/DIV., 1 ms./DIV.
    Condition	Engine speed maintained at 2500 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.