Terminals Of ECM

Fig 1: Identifying ECM Connectors 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, 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): 

   CAMSHAFT TIMING OIL CONTROL VALVE WAVEFORM
   
   

   ECM Terminal Names	Between OC1+ and OC1-
   Tester Ranges	5 V/DIV., 1 ms./DIV.
   Conditions	Idling

   Fig 2: Camshaft Timing Oil Control Valve (OCV) Waveform Graph

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2. WAVEFORM 2 

   Heated oxygen sensor: 

   HEATED OXYGEN SENSOR WAVEFORM
   
   

   ECM Terminal Names	Between OX1B and E2
   Tester Ranges	0.2 V/DIV., 200 ms./DIV.
   Conditions	Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

   HINT:

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

   Fig 3: Identifying Waveform - Heated Oxygen Sensor

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3. WAVEFORM 3 

   Injector No. 1 (to No. 4) injection signal: 

   INJECTION SIGNAL WAVEFORM
   
   

   ECM Terminal Names	Between #10 (to #40) and E01
   Tester Ranges	20V/DIV., 20ms./DIV.
   Conditions	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 4: Injection Signal Waveform Graph

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4. WAVEFORM 4 

   Knock sensor: 

   KNOCK SENSOR WAVEFORM
   
   

   ECM Terminal Names	Between KNK1 and EKNK
   Tester Ranges	1 V/DIV, 1 ms./DIV.
   Conditions	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: Knock Sensor Waveform Graph

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5. WAVEFORM 5 

   Crankshaft position sensor and camshaft position sensor: 

   CRANKSHAFT POSITION SENSOR AND CAMSHAFT POSITION SENSOR WAVEFORM
   
   

   ECM Terminal Names	CH1: Between G2+ and NE- CH2: Between NE+ and NE-
   Tester Ranges	5 V/DIV, 20 ms./DIV.
   Conditions	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 6: Crankshaft Position Sensor And Camshaft Position Sensor Waveform Graph

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6. WAVEFORM 6 

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

   IGNITER IGT SIGNAL WAVEFORM
   
   

   ECM Terminal Names	Between IGT (1 to 4) and E1 Between IGF1 and E1
   Tester Ranges	2 V/DIV, 20 ms./DIV.
   Conditions	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 7: Waveform Graph (Waveform 6)

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7. WAVEFORM 7 

   Purge VSV: 

   PURGE VSV WAVEFORM
   
   

   ECM Terminal Names	Between PRG and E1
   Tester Ranges	5 V/DIV, 50 ms./DIV.
   Conditions	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: 

   VEHICLE SPEED SIGNAL WAVEFORM
   
   

   ECM Terminal Names	Between SPD and E1
   Tester Ranges	2 V/DIV., 20 ms./DIV.
   Conditions	Ignition switch ON, rotate driving wheel slowly

   HINT:

   The wavelength becomes shorter as the vehicle speed increases.

   Fig 9: Waveform Graph (Waveform 8)

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9. WAVEFORM 9 

   Throttle actuator positive terminal: 

   THROTTLE ACTUATOR POSITIVE TERMINAL WAVEFORM
   
   

   ECM Terminal Names	Between M+ and ME01
   Tester Ranges	5 V/DIV, 1ms./DIV.
   Conditions	Idling with warm engine

   HINT:

   The duty ratio varies depending on the throttle actuator operation.

   Fig 10: Identifying Waveform - Throttle Actuator Positive Terminal

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10. WAVEFORM 10 

    Throttle actuator negative terminal: 

    THROTTLE ACTUATOR NEGATIVE TERMINAL WAVEFORM
    
    

    ECM Terminal Names	Between M- and ME01
    Tester Ranges	5 V/DIV, 1ms./DIV.
    Conditions	Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 11: Identifying Waveform - Throttle Actuator Negative Terminal

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11. WAVEFORM 11 

    Engine speed signal: 

    ENGINE SPEED SIGNAL WAVEFORM
    
    

    ECM Terminal Names	Between TACH and E1
    Tester Ranges	5 V/DIV, 10 ms./DIV.
    Conditions	Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 12: Identifying Waveform - Engine Speed Signal

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12. WAVEFORM 12 

    CAN communication signal: 

    CAN COMMUNICATION SIGNAL WAVEFORM
    
    

    ECM Terminal Names	Between CANH and E1
    Tester Ranges	1 V/DIV, 10 μsec/DIV.
    Conditions	Engine stops and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 13: CAN Communication Signal Waveform Graph

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13. WAVEFORM 13 

    CAN communication signal: 

    CAN COMMUNICATION SIGNAL WAVEFORM
    
    

    ECM Terminal Names	Between CANL and E1
    Tester Ranges	1 V/DIV, 10 μsec./DIV.
    Conditions	Engine stops and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 14: CAN Communication Signal Waveform Graph

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