Terminals Of ECM

Fig 1: Identifying Terminals Of ECM

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HINT:

The standard normal voltage between each pair of the ECM (included in the hybrid vehicle control ECU) 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, shown 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
   
   

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

   ECM Terminal Name	Between OX1B and E2 or OX2B and E2
   Tester Range	0.2 V/DIV., 200 msec./DIV.
   Condition	Engine speed maintained at 2500 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
   
   

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

   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 4000 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 

   WAVEFORM REFERENCE
   
   

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

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

   WAVEFORM REFERENCE
   
   

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

   Purge VSV 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	Between PRG and E1
   Tester Range	5 V/DIV., 50 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 8: Identifying Waveform 7

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8. WAVEFORM 8 

   Vehicle speed signal 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	Between SPDI 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 9: Identifying Waveform 8

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9. WAVEFORM 9 

   Throttle actuator positive terminal 

   WAVEFORM REFERENCE
   
   

   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 10: Identifying Waveform 9

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10. WAVEFORM 10 

    Throttle actuator negative terminal 

    WAVEFORM REFERENCE
    
    

    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: Identifying Waveform 10

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11. WAVEFORM 11 

    CAN communication signal 

    WAVEFORM REFERENCE
    
    

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

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 12: Identifying Waveform 11

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12. WAVEFORM 12 

    CAN communication signal 

    WAVEFORM REFERENCE
    
    

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

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 13: Identifying Waveform 12

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