Terminals Of ECM [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 are 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.

*: except Mexico Models

1. WAVEFORM 1 
   Fig 1: Waveform 1

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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.

2. WAVEFORM 2 
   Fig 2: Waveform 2

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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.

3. WAVEFORM 3 
   Fig 3: Waveform 3

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   CAN COMMUNICATION SIGNAL (REFERENCE)
   
   

   ECM Terminal Name	Between CANL and E1 Between CACL 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.

4. WAVEFORM 4 
   Fig 4: Waveform 4

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   CAN COMMUNICATION SIGNAL (REFERENCE)
   
   

   ECM Terminal Name	Between CANH and E1 Between CACH 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 
   Fig 5: Waveform 5

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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

6. WAVEFORM 6 
   Fig 6: Waveform 6

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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

7. WAVEFORM 7 
   Fig 7: Waveform 7

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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

8. WAVEFORM 8 
   Fig 8: Waveform 8

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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.

9. WAVEFORM 9 
   Fig 9: Waveform 9

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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.

10. WAVEFORM 10 
    Fig 10: Waveform 10

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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.

11. WAVEFORM 11 
    Fig 11: Waveform 11

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

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

12. WAVEFORM 12 
    Fig 12: Waveform 12

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    FUEL (ENGINE ROOM SIDE) PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE)
    
    

    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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    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"

14. WAVEFORM 14 
    Fig 14: Waveform 14

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

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

15. WAVEFORM 15 
    Fig 15: Waveform 15

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    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.
16. WAVEFORM 16 
    Fig 16: Waveform 16

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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.

17. WAVEFORM 17 
    Fig 17: Waveform 17

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    IGNITION COIL ASSEMBLY SIGNAL (IGT SIGNAL)
    
    

    ECM Terminal Name	Between IGT (1 to 4) and E1
    Tester Range	2 V/DIV., 20 ms./DIV.
    Condition	Idling with warm engine

    HINT: 

    The wavelength becomes shorter as the engine speed increases.

18. WAVEFORM 18 
    Fig 18: Waveform 18

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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

19. WAVEFORM 19 
    Fig 19: Waveform 19

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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.

20. WAVEFORM 20 
    Fig 20: Waveform 20

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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.

21. WAVEFORM 21 
    Fig 21: Waveform 21

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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 the engine

    HINT: 

    • The wavelength becomes shorter as the engine speed increases.
    • The waveforms and amplitudes displayed differ slightly depending on the vehicle.