Terminals Of ECM [11/2018 - 10/2019]

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HINT: 

The standard voltage, resistance and waveform between each pair of the ECM terminals are 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 
   Fig 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 
   Fig 2: Waveform 2

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   ENGINE SPEED SIGNAL
   
   

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

   HINT: 

   The wavelength becomes shorter as the engine speed increases.

3. WAVEFORM 3 
   Fig 3: Waveform 3

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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.

4. WAVEFORM 4 
   Fig 4: Waveform 4

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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.

5. WAVEFORM 5 
   Fig 5: Waveform 5

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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.

6. WAVEFORM 6 
   Fig 6: Waveform 6

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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.

7. WAVEFORM 7 
   Fig 7: Waveform 7

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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.

8. WAVEFORM 8 
   Fig 8: Waveform 8

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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.

9. WAVEFORM 9 
   Fig 9: Waveform 9

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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

10. WAVEFORM 10 
    Fig 10: Waveform 10

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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

11. WAVEFORM 11 
    Fig 11: Waveform 11

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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"

12. WAVEFORM 12 
    Fig 12: Waveform 12

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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"

13. WAVEFORM 13 
    Fig 13: Waveform 13

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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

14. WAVEFORM 14 
    Fig 14: Waveform 14

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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

15. WAVEFORM 15 
    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

    Fig 15: Waveform 15

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16. WAVEFORM 16 
    Fig 16: Waveform 16

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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.

17. WAVEFORM 17 
    Fig 17: Waveform 17

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    ENGINE WATER PUMP ASSEMBLY SIGNAL (FROM ECM TO ENGINE WATER PUMP 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 engine water pump assembly speed.

18. WAVEFORM 18 
    Fig 18: Waveform 18

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    ENGINE WATER PUMP ASSEMBLY SIGNAL (FROM ENGINE WATER PUMP 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 engine water pump assembly speed increases.

19. WAVEFORM 19 
    Fig 19: Waveform 19

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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.

20. WAVEFORM 20 
    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.

    Fig 20: Waveform 20

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21. WAVEFORM 21 
    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

    Fig 21: Waveform 21

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22. WAVEFORM 22 
    Fig 22: Waveform 22

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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.
23. WAVEFORM 23 
    Fig 23: Waveform 23

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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.

24. WAVEFORM 24 
    Fig 24: Waveform 24

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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.

25. WAVEFORM 25 
    Fig 25: Waveform 25

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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

26. WAVEFORM 26 
    Fig 26: Waveform 26

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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 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.