Terminals Of ECM

Fig 1: Identifying ECM 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 the terminals, and displayed in the "Specified Conditions" column. The illustration above can be used as a reference to identify the ECM terminal locations.

1. WAVEFORM 1 

   Igniter IGT signal (from ECM to igniter) 

   WAVEFORM REFERENCE (WAVEFORM 1)
   
   

   ECM Terminal Name	Between IGT (1 to 4) and E1 Between IGF1 and E1
   Tester Range	2 v/DIV, 20 ms/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 

   Crankshaft position sensor and camshaft position sensors 

   WAVEFORM REFERENCE (WAVEFORM 2)
   
   

   ECM Terminal Name	Between NE+ and NE- Between G2+ and G2- Between EV1+ and EV1-
   Tester Range	5 v/DIV, 20 ms/DIV
   Condition	Idle after engine warmed-up

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 3: Waveform Graph (Waveform 2)

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3. WAVEFORM 3 

   No. 1 (to No. 4) injector signal 

   WAVEFORM REFERENCE (WAVEFORM 3)
   
   

   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 rpm increases.

   Fig 4: Waveform Graph (Waveform 3)

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4. WAVEFORM 4 

   Air fuel ration sensor (sensor 1) heater 

   WAVEFORM REFERENCE (WAVEFORM 4)
   
   

   ECM Terminal Name	Between HA1A and E04
   Tester Range	5 v/DIV, 10 ms/DIV
   Condition	Idling with warm engine

   HINT:

   The wavelength varies in accordance with the engine operating condition.

   Fig 5: Waveform Graph (Waveform 4)

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5. WAVEFORM 5 

   Heated oxygen sensor (sensor 2) 

   WAVEFORM REFERENCE (WAVEFORM 5)
   
   

   ECM Terminal Name	Between OX1B and EX1B
   Tester Range	0.2 v/DI.V, 200 ms/DIV
   Condition	Maintain engine speed at 2,500 rpm for 2 minutes after warming up sensor

   HINT:

   In the Data List, the items O2S B1 S2 show the values input to the ECM from the heated oxygen sensor.

   Fig 6: Waveform Graph (Waveform 5)

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6. WAVEFORM 6 

   Knock sensor 

   WAVEFORM REFERENCE (WAVEFORM 6)
   
   

   ECM Terminal Name	Between KNK1 and EKNK
   Tester Range	500 mv/DIV, 1 ms/DIV
   Condition	Maintain engine RPM at 4,000 rpm after engine warmed-up

   HINT:

   • The wavelength becomes shorter as the engine rpm increases.
   • The waveforms and amplitudes displayed differ slightly depending on the vehicle condition.
     Fig 7: Waveform Graph (Waveform 6)

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7. WAVEFORM 7 

   Vehicle speed signal 

   WAVEFORM REFERENCE (WAVEFORM 7)
   
   

   ECM Terminal Name	Between SPD and E1
   Tester Range	5 v/DIV, 20 ms/DIV
   Condition	Rotate driving wheel slowly

   HINT:

   The wavelength becomes shorter as the vehicle speed increases.

   Fig 8: Waveform Graph (Waveform 7)

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8. WAVEFORM 8 

   Throttle actuator positive terminal 

   WAVEFORM REFERENCE (WAVEFORM 8)
   
   

   ECM Terminal Name	Between M+ and ME01
   Tester Range	5 v/DIV, 1 ms/DIV
   Condition	Idle after engine warmed-up

   HINT:

   The duty ratio varies depending on the throttle actuator operation.

   Fig 9: Waveform Graph (Waveform 8)

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9. WAVEFORM 9 

   Throttle actuator negative terminal 

   WAVEFORM REFERENCE (WAVEFORM 9)
   
   

   ECM Terminal Name	Between M- and ME01
   Tester Range	5 v/DIV, 1 ms/DIV
   Condition	Idle after engine warmed-up

   HINT:

   The duty ratio varies depending on the throttle actuator operation.

   Fig 10: Waveform Graph (Waveform 9)

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10. WAVEFORM 10 

    Purge VSV 

    WAVEFORM REFERENCE (WAVEFORM 10)
    
    

    ECM Terminal Name	Between PRG and E1
    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.

    Fig 11: Waveform Graph (Waveform 10)

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11. WAVEFORM 11 

    Engine speed signal 

    WAVEFORM REFERENCE (WAVEFORM 11)
    
    

    ECM Terminal Name	Between TACH and E1
    Tester Range	5 v/DIV, 10ms/DIV
    Condition	Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 12: Waveform Graph (Waveform 11)

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12. WAVEFORM 12 

    Camshaft timing oil control valve (OCV) (for intake camshaft) 

    WAVEFORM REFERENCE (WAVEFORM 12)
    
    

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

    Fig 13: Waveform Graph (Waveform 12)

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13. WAVEFORM 13 

    CAN communication signal (Reference) 

    WAVEFORM REFERENCE (WAVEFORM 13)
    
    

    ECM Terminal Name	Between CANH and E1
    Tester Range	1 v/DIV, 10 μs/DIV
    Condition	Engine stop and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 14: Waveform Graph (Waveform 13)

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14. WAVEFORM 14 

    CAN communication signal (Reference) 

    WAVEFORM REFERENCE (WAVEFORM 14)
    
    

    ECM Terminal Name	Between CANL and E1
    Tester Range	1 v/DIV, 10 μs/DIV
    Condition	Engine stop and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 15: Waveform Graph (Waveform 14)

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15. WAVEFORM 15 

    Camshaft timing oil control valve (OCV) (for exhaust camshaft) 

    WAVEFORM REFERENCE (WAVEFORM 15)
    
    

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

    Fig 16: Waveform Graph (Waveform 15)

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