Terminals Of ECM

Fig 1: B51 And A18 Connectors Terminal Identification

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HINT: 

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

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

1. WAVEFORM 1 
   Fig 2: Identifying Waveform 1

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   CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY SIGNAL
   
   

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

2. WAVEFORM 2 
   Fig 3: Identifying Waveform 2

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   AIR FUEL RATIO SENSOR (SENSOR 1) HEATER OPERATION SIGNAL
   
   

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

3. WAVEFORM 3 
   Fig 4: Identifying Waveform 3

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   HEATED OXYGEN SENSOR (SENSOR 2) SIGNAL
   
   

   ECM Terminal Name	Between OX1B and EX1B
   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 item O2S B1S2 shows the values input to the ECM from the heated oxygen sensor.

4. WAVEFORM 4 
   Fig 5: Identifying Waveform 4

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   NO. 1 (TO NO. 4) FUEL INJECTOR ASSEMBLY 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: Waveform 5

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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 condition.
6. WAVEFORM 6 
   Fig 7: Identifying Waveform 6

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   CAMSHAFT POSITION SENSOR SIGNAL
   
   

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

   HINT: 

   The wavelength becomes shorter as the engine speed increases.

7. WAVEFORM 7 
   Fig 8: Identifying Waveform 7

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   CAMSHAFT REVOLUTION SIGNAL FROM ECM TO POWER MANAGEMENT CONTROL ECU AND INVERTER WITH CONVERTER ASSEMBLY
   
   

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

   HINT: 

   The wavelength becomes shorter as the engine speed increases.

8. WAVEFORM 8 
   Fig 9: Identifying Waveform 8

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   CRANKSHAFT POSITION SENSOR SIGNAL
   
   

   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.

9. WAVEFORM 9 
   Fig 10: Identifying Waveform 9

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   IGNITION COIL ASSEMBLY SIGNAL (IGT AND IGF SIGNAL)
   
   

   ECM Terminal Name	CH1: Between IGT (1 to 4) and E1 CH2: Between IGF1 and E1
   Tester Range	2 V/DIV., 20 ms./DIV.
   Condition	Idling

   HINT: 

   The wavelength becomes shorter as the engine speed increases.

10. WAVEFORM 10 
    Fig 11: Identifying Waveform 10

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    PURGE VSV SIGNAL
    
    

    ECM Terminal Name	Between PRG and E01
    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.

11. WAVEFORM 11 
    Fig 12: Identifying 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 
    Fig 13: Identifying Waveform 12

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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.

13. WAVEFORM 13 
    Fig 14: Identifying Waveform 13

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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.

14. WAVEFORM 14 
    Fig 15: Identifying Waveform 14

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    CAN COMMUNICATION SIGNAL (REFERENCE)
    
    

    ECM Terminal Name	Between CANH and E1, or CANP and E1
    Tester Range	1 V/DIV., 10 μs./DIV.
    Condition	Power switch on (IG)

    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, or CANN and E1
    Tester Range	1 V/DIV., 10 μs./DIV.
    Condition	Power switch on (IG)

    HINT: 

    The waveform varies depending on the CAN communication signal.

16. WAVEFORM 16 
    Fig 17: Identifying Waveform 16

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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.

17. WAVEFORM 17 
    Fig 18: Identifying 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 wavelength becomes shorter as the engine water pump assembly speed increases.

18. WAVEFORM 18 
    Fig 19: Identifying Waveform 18

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    EGR VALVE ASSEMBLY SIGNAL
    
    

    ECM Terminal Name	Between EGR1 and E1 Between EGR2 and E1 Between EGR3 and E1 Between EGR4 and E1
    Tester Range	20 V/DIV., 50 ms./DIV.
    Condition	EGR valve operating

19. WAVEFORM 19 
    Fig 20: Identifying 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	Power switch on (IG), A/C switch on (max cool)

    HINT: 

    The duty ratio varies depending on the engine coolant temperature.