Terminals Of ECM

Fig 1: Identifying ECM Connector Terminal E3, E4, E5, E6, A6 And A5

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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.

HINT:

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

1. WAVEFORM 1 

   Camshaft timing oil control valve (OCV): 

   WAVEFORM REFERENCE CHART
   
   

   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 ms./DIV
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 2: Identifying Waveform 1

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2. WAVEFORM 2 

   Heated oxygen sensor: 

   WAVEFORM REFERENCE CHART
   
   

   ECM Terminal Name	Between OX1B and O1B- or OX2B and O2B-
   Tester Range	0.2 V/DIV, 200 ms./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: Identifying Waveform 2

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3. WAVEFORM 3 

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

   WAVEFORM REFERENCE CHART
   
   

   ECM Terminal Name	Between #10 (to #60) and E1
   Tester Range	2 V/DIV, 20 ms./DIV
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 4: Identifying Waveform 3

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4. WAVEFORM 4 

   Knock sensor: 

   WAVEFORM REFERENCE CHART
   
   

   ECM Terminal Name	Between KNK1 and EKNK Between KNK2 and EKNK2
   Tester Range	0.01 to 10 V/DIV, 0.01 to 10 ms./DIV
   Condition	Engine speed maintained at 4,000 rpm after warming up engine

   HINT:

   • The wavelength becomes shorter as the engine rpm increases.
   • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
   Fig 5: Identifying Waveform 4

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5. WAVEFORM 5 

   Crankshaft position sensor and VVT sensor for intake camshaft: 

   WAVEFORM REFERENCE CHART
   
   

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

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 6: Identifying Waveform 5

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6. WAVEFORM 6 

   Crankshaft position sensor and VVT sensor for exhaust camshaft: 

   WAVEFORM REFERENCE CHART
   
   

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

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 7: Identifying 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 CHART
   
   

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

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 8: Identifying Waveform 7

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8. WAVEFORM 8 

   EVAP VSV: 

   WAVEFORM REFERENCE CHART
   
   

   ECM Terminal Name	Between PRG and E1
   Tester Range	5 V/DIV, 50 ms./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: Identifying Waveform 8

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9. WAVEFORM 9 

   Vehicle speed signal: 

   WAVEFORM REFERENCE CHART
   
   

   ECM Terminal Name	Between SPD and E1
   Tester Range	5 V/DIV, 20 ms./DIV
   Condition	Driving at 12 mph (20 km/h)

   HINT:

   The wavelength becomes shorter as the vehicle speed increases.

   Fig 10: Identifying Waveform 9

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10. WAVEFORM 10 

    Throttle actuator positive terminal: 

    WAVEFORM REFERENCE CHART
    
    

    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.

    Fig 11: Identifying Waveform 10

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11. WAVEFORM 11 

    Throttle actuator negative terminal: 

    WAVEFORM REFERENCE CHART
    
    

    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.

    Fig 12: Identifying Waveform 11

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12. WAVEFORM 12 

    Engine speed signal: 

    WAVEFORM REFERENCE CHART
    
    

    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 rpm increases.

    Fig 13: Identifying Waveform 12

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13. WAVEFORM 13 

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

    WAVEFORM REFERENCE CHART
    
    

    ECM Terminal Name	Between INJF and E1
    Tester Range	2 V/DIV, 20 ms./DIV
    Condition	Idling with warm engine

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 14: Identifying Waveform 13

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14. WAVEFORM 14 

    High pressure side fuel pump (Spill valve): 

    WAVEFORM REFERENCE CHART
    
    

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

    Fig 15: Identifying Waveform 14

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15. WAVEFORM 15 

    DC motor for SCV positive terminal: 

    WAVEFORM REFERENCE CHART
    
    

    ECM Terminal Name	Between IA1+ and E01
    Tester Range	5 V/DIV, 1 ms./DIV
    Condition	Idling with warm engine

    Fig 16: Identifying Waveform 15

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16. WAVEFORM 16 

    DC motor for SCV negative terminal: 

    WAVEFORM REFERENCE CHART
    
    

    ECM Terminal Name	Between IA1-and E01
    Tester Range	5 V/DIV, 1 ms./DIV
    Condition	Idling with warm engine

    Fig 17: Identifying Waveform 16

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17. WAVEFORM 17 

    CAN communication signal: 

    WAVEFORM REFERENCE CHART
    
    

    ECM Terminal Name	Between CANH and E1
    Tester Range	1 V/DIV, 10 μs/DIV
    Condition	Stop engine and engine switch on (IG)

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 18: Identifying Waveform 17

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18. WAVEFORM 18 

    CAN communication signal: 

    WAVEFORM REFERENCE CHART
    
    

    ECM Terminal Name	Between CANL and E1
    Tester Range	1 V/DIV, 10 μs/DIV
    Condition	Stop engine and engine switch on (IG)

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 19: Identifying Waveform 18

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