Terminals Of ECM

Fig 1: Identifying ECM Connector Terminals

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HINT:

The standard normal voltage 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 normal 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.

1. WAVEFORM 1 

   Camshaft timing oil control valve (OCV): 

   WAVEFORM REFERENCE (WAVEFORM 1)
   
   

   ECM Terminal Name	Between OC1+ and OC1- or OC2+ and OC2- Between OE1+ and OE1- or OE2+ and OE2-
   Tester Range	5 V/DIV., 1 msec./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 2: Waveform Graph (Waveform 1)

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2. WAVEFORM 2 

   Heated oxygen sensor: 

   WAVEFORM REFERENCE (WAVEFORM 2)
   
   

   ECM Terminal Name	Between 0X1B and 01B- or OX2B and 02B-
   Tester Range	0.2 V/DIV., 200 msec./DIV.
   Condition	Engine speed maintained at 2,500 rpm for 2 minutes after warming up engine

   HINT:

   In DATA LIST, item O2S B1 S2 shows the ECM input values from the heated oxygen sensor.

   Fig 3: Waveform Graph (Waveform 2)

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3. WAVEFORM 3 

   Injector for direct injection No. 1 (to No. 6) injection signal: 

   WAVEFORM REFERENCE (WAVEFORM 3)
   
   

   ECM Terminal Name	Between #1D (to #6D) and E1
   Tester Range	2 V/DIV., 20 msec./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 4: Waveform Graph (Waveform 3)

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4. WAVEFORM 4 

   Knock sensor: 

   WAVEFORM REFERENCE (WAVEFORM 4)
   
   

   ECM Terminal Name	Between KNK1 and EKNK Between KNK2 and EKN2
   Tester Range	0.01 to 10 V/DIV., 0.01 to 10 msec./DIV.
   Condition	Engine speed maintained at 4,000 rpm after warming up engine

   HINT:

   • The wavelength becomes shorter as the engine rpm increases.
     Fig 5: Waveform Graph (Waveform 4)

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   • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
5. WAVEFORM 5 

   Crankshaft position sensor and VVT sensor for intake side: 

   WAVEFORM REFERENCE (WAVEFORM 5)
   
   

   ECM Terminal Name	Between NE+ and NE- Between VV1+ and VV1- or VV2+ and VV2-
   Tester Range	5 V/DIV., 20 msec./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 6: Waveform Graph (Waveform 5)

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6. WAVEFORM 6 

   Crankshaft position sensor and VVT sensor for exhaust side: 

   WAVEFORM REFERENCE (WAVEFORM 6)
   
   

   ECM Terminal Name	Between NE+ and NE- Between EV1+ and EV1- or EV2+ and EV2-
   Tester Range	5 V/DIV., 20 msec./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 7: Waveform Graph (Waveform 6)

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7. WAVEFORM 7 

   Igniter IGT signal (from ECM to igniter) and Igniter IGF signal (from igniter to ECM): 

   WAVEFORM REFERENCE (WAVEFORM 7)
   
   

   ECM Terminal Name	Between IGT (1 to 6) and E1 Between IGF1 and E1 or IGF2 and E1
   Tester Range	2 V/DIV., 20 msec./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 8: Waveform Graph (Waveform 7)

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8. WAVEFORM 8 

   Purge VSV:

   WAVEFORM REFERENCE (WAVEFORM 8)
   
   

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

   HINT:

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

   Fig 9: Waveform Graph (Waveform 8)

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9. WAVEFORM 9 

   Vehicle speed signal: 

   WAVEFORM REFERENCE (WAVEFORM 9)
   
   

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

   HINT:

   The wavelength becomes shorter as the vehicle speed increases.

   Fig 10: Waveform Graph (Waveform 9)

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10. WAVEFORM 10 

    Throttle actuator positive terminal: 

    WAVEFORM REFERENCE (WAVEFORM 10)
    
    

    ECM Terminal Name	Between M+ and ME01
    Tester Range	5 V/DIV., 1 msec./DIV.
    Condition	Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 11: Waveform Graph (Waveform 10)

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11. WAVEFORM 11 

    Throttle actuator negative terminal: 

    WAVEFORM REFERENCE (WAVEFORM 11)
    
    

    ECM Terminal Name	Between M- and ME01
    Tester Range	5 V/DIV., 1 msec./DIV.
    Condition	Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 12: Waveform Graph (Waveform 11)

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12. WAVEFORM 12 

    Engine speed signal: 

    WAVEFORM REFERENCE (WAVEFORM 12)
    
    

    ECM Terminal Name	Between TACH and E1
    Tester Range	5 V/DIV., 10 msec./DIV.
    Condition	Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 13: Waveform Graph (Waveform 12)

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13. WAVEFORM 13 

    Injector for direct injection No. 1 (to No. 6) injection signal and Injection confirmation signal: 

    WAVEFORM REFERENCE (WAVEFORM 13)
    
    

    ECM Terminal Name	CH1: Between #1D or#4D and E1 CH2: Between IJF1 and E1
    	CH1: Between #2D or #5D and E1 CH2: Between IJF2 and E1
    	CH1: Between #3D or #6D and E1 CH2: Between IJF3 and E1
    Tester Range	2 V/DIV., 20 msec./DIV.
    Condition	Idling with warm engine

    Fig 14: Waveform Graph (Waveform 13)

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    HINT:

    The wavelength becomes shorter as the engine rpm increases.

14. WAVEFORM 14 

    Fuel pump for high pressure (Spill control valve): 

    WAVEFORM REFERENCE (WAVEFORM 14)
    
    

    ECM Terminal Name	CH1: Between FPD and E1 CH2: Between FPF1 and E1
    Tester Range	2 V/DIV., 5 msec./DIV.
    Condition	Idling with warm engine

    Fig 15: Waveform Graph (Waveform 14)

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15. WAVEFORM 15 

    CAN communication signal: 

    WAVEFORM REFERENCE (WAVEFORM 15)
    
    

    ECM Terminal Name	Between CANH and E1
    Tester Range	1 V/DIV., 10 μsec./DIV.
    Condition	Engine switch on (IG)

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 16: Waveform Graph (Waveform 15)

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16. WAVEFORM 16 

    CAN communication signal: 

    WAVEFORM REFERENCE (WAVEFORM 16)
    
    

    ECM Terminal Name	Between CANL and E1
    Tester Range	1 V/DIV., 10 μsec./DIV.
    Condition	Engine switch on (IG)

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 17: Waveform Graph (Waveform 16)

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17. WAVEFORM 17 

    Injector for port injection No. 1 (to No. 6) injection signal: 

    WAVEFORM REFERENCE (WAVEFORM 17)
    
    

    ECM Terminal Name	Between #1P (to #6P) and E1
    Tester Range	50 V/DIV., 400 μsec./DIV.
    Condition	Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 18: Waveform Graph (Waveform 17)

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18. WAVEFORM 18 

    Cooling fan ECU signal: 

    WAVEFORM REFERENCE (WAVEFORM 18)
    
    

    ECM Terminal Name	Between RFC and E1
    Tester Range	1 V/DIV., 20 msec./DIV.
    Condition	Idling with A/C ON

    Fig 19: Waveform Graph (Waveform 18)

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