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 HV 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 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
   
   

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

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 2: Waveform 1 Graph

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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 ms./DIV.
   Condition	Engine speed maintained at 2,500 rpm for 2 minutes after warning up engine

   HINT:

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

   Fig 3: Waveform 2 Graph

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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 ms./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 4: Waveform 3 Graph

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4. WAVEFORM 4 

   Knock sensor 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	Between KNK1 and EKNK1 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: Waveform 4 Graph

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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 ms./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 6: Waveform 5 Graph

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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 ms./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 7: Waveform 6 Graph

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7. WAVEFORM 7 

   EVAP VSV 

   WAVEFORM REFERENCE
   
   

   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 8: Waveform 7 Graph

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8. WAVEFORM 8 

   Vehicle speed signal 

   WAVEFORM REFERENCE
   
   

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

   HINT:

   The wavelength becomes shorter as the vehicle speed increases.

   Fig 9: Waveform 8 Graph

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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, 1ms./DIV.
   Condition	Idling with warm engine

   HINT:

   The duty ratio varies depending on the throttle actuator operation.

   Fig 10: Waveform 9 Graph

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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 ms./DIV.
    Condition	Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 11: Waveform 10 Graph

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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 μs/DIV.
    Condition	Stop engine and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 12: Waveform 11 Graph

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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 μs/DIV.
    Condition	Stop engine and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 13: Waveform 12 Graph

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