Terminals Of ECM

Fig 1: Identifying ECM Connector Terminals

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HINT:

The standard voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard 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 Signal 

   WAVEFORM REFERENCE
   
   

   Terminal No. (Symbol)	Tool Setting	Condition
   B49-28 (OC1+) - B49-22 (OC1-)	5 V/DIV, 1 ms/DIV	Idling
   B50-25 (OE1+) - B50-19 (OE1-)	5 V/DIV, 1 ms/DIV	Idling

   Fig 2: Identifying Waveform 1

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2. WAVEFORM 2 

   Air Fuel Ratio Sensor (Bank 1 Sensor 1) Heater Signal 

   WAVEFORM REFERENCE
   
   

   Terminal No. (Symbol)	Tool Setting	Condition
   B49-29 (HA1A) - B48-11 (E04)	5 V/DIV, 10 ms/DIV	Idling with warm engine

   HINT:

   The wavelength varies in accordance with the engine operating condition.

   Fig 3: Identifying Waveform 2

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3. WAVEFORM 3 

   Heated Oxygen Sensor (Bank 1 Sensor 2) Signal 

   WAVEFORM REFERENCE
   
   

   Terminal No. (Symbol)	Tool Setting	Condition
   B49-2 (OX1B) - B49-8 (O1B-)	0.2 V/DIV, 200 ms/DIV	Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

   HINT:

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

   Fig 4: Identifying Waveform 3

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4. WAVEFORM 4 

   Injector No. 1 (to No. 4) Injection Signal 

   WAVEFORM REFERENCE
   
   

   Terminal No. (Symbol)	Tool Setting	Condition
   B48-7 (#10) - B48-1 (E01)	20 V/DIV, 20 ms/DIV	Idling
   B48-8 (#20) - B48-1 (E01)	20 V/DIV, 20 ms/DIV	Idling
   B48-9 (#30) - B48-1 (E01)	20 V/DIV, 20 ms/DIV	Idling
   B48-10 (#40) - B48-1 (E01)	20 V/DIV, 20 ms/DIV	Idling

   HINT:

   The wavelength becomes shorter as the engine speed increases.

   Fig 5: Identifying Waveform 4

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5. WAVEFORM 5 

   Knock Sensor Signal 

   WAVEFORM REFERENCE
   
   

   Terminal No. (Symbol)	Tool Setting	Condition
   B51-12 (KNK1) - B51-6 (EKNK)	1 V/DIV, 1 ms/DIV	Engine speed maintained at 4000 rpm after warming up engine

   HINT:

   • The wavelength becomes shorter as the engine speed increases.
   • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
     Fig 6: Identifying Waveform 5

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6. WAVEFORM 6 

   Crankshaft Position Sensor and Camshaft Position Sensor Signal 

   WAVEFORM REFERENCE
   
   

   Terminal No. (Symbol)	Tool Setting	Condition
   B50-14 (NE+) - B50-2 (NE-)	5 V/DIV, 20 ms/DIV	idling
   B49-17 (G2+) - B49-5 (G2-)	5 V/DIV, 20 ms/DIV	Idling
   B50-13 (EV1+) - B50-1 (EV1-)	5 V/DIV, 20 ms/DIV	Idling

   HINT:

   The wavelength becomes shorter as the engine speed increases.

   Fig 7: Identifying Waveform 6

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7. WAVEFORM 7 

   Ignition Coil IGT Signal (from ECM to Ignition Coil) and Ignition Coil IGF Signal (from Ignition Coil to ECM) 

   WAVEFORM REFERENCE
   
   

   Terminal No. (Symbol)	Tool Setting	Condition
   B48-2 (IGT1) - B49-6 (E1)	2 V/DIV, 20 ms/DIV	Idling
   B48-3 (IGT2) - B49-6 (E1)	2 V/DIV, 20 ms/DIV	Idling
   B48-4 (IGT3) - B49-6 (E1)	2 V/DIV, 20 ms/DIV	Idling
   B48-5 (IGT4) - B49-6 (E1)	2 V/DIV, 20 ms/DIV	Idling
   B48-16 (IGF1) - B49-6 (E1)	2 V/DIV, 20 ms/DIV	Idling

   HINT:

   The wavelength becomes shorter as the engine speed increases.

   Fig 8: Identifying Waveform 7

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8. WAVEFORM 8 

   Purge VSV Signal 

   WAVEFORM REFERENCE
   
   

   Terminal No. (Symbol)	Tool Setting	Condition
   B51-26 (PRG) - B49-6 (E1)	10 V/DIV, 20 ms/DIV	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
   
   

   Terminal No. (Symbol)	Tool Setting	Condition
   D60-29 (SPD) - B49-6 (E1)	2 V/DIV, 20 ms/DIV	Vehicle driven 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 Signal 

    WAVEFORM REFERENCE
    
    

    Terminal No. (Symbol)	Tool Setting	Condition
    B48-18 (M+) - B48-20 (ME01)	5 V/DIV, 1 ms/DIV	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 Signal 

    WAVEFORM REFERENCE
    
    

    Terminal No. (Symbol)	Tool Setting	Condition
    B48-19 (M-) - B48-20 (ME01)	5 V/DIV, 1 ms/DIV	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
    
    

    Terminal No. (Symbol)	Tool Setting	Condition
    D60-23 (TACH) - B49-6 (E1)	5 V/DIV, 10 ms/DIV	Idling

    HINT:

    The wavelength becomes shorter as the engine speed increases.

    Fig 13: Identifying Waveform 12

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13. WAVEFORM 13 

    CAN Communication Signal (Reference) 

    WAVEFORM REFERENCE
    
    

    Terminal No. (Symbol)	Tool Setting	Condition
    D61-18 (CANH) - B49-6 (E1)	1 V/DIV, 10 μs/DIV	Ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 14: Identifying Waveform 13

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14. WAVEFORM 14 

    CAN Communication Signal (Reference) 

    WAVEFORM REFERENCE
    
    

    Terminal No. (Symbol)	Tool Setting	Condition
    D61-20 (CANL) - B49-6 (E1)	1 V/DIV, 10 μs/DIV	Ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 15: Identifying Waveform 14

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15. WAVEFORM 15 

    DC Motor for Tumble Control Valve Positive Terminal Signal 

    WAVEFORM REFERENCE
    
    

    Terminal No. (Symbol)	Tool Setting	Condition
    B51-33 (IA1+) - B48-1 (E01)	5 V/DIV, 1 ms/DIV	Idling with cold engine

    Fig 16: Identifying Waveform 15

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16. WAVEFORM 16 

    DC Motor for Tumble Control Valve Negative Terminal Signal 

    WAVEFORM REFERENCE
    
    

    Terminal No. (Symbol)	Tool Setting	Condition
    B51-34 (IA1-) - B48-1 (E01)	5 V/DIV, 1 ms/DIV	Idling with cold engine

    Fig 17: Identifying Waveform 16

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17. WAVEFORM 17 

    CAN Communication Signal 

    WAVEFORM REFERENCE
    
    

    Terminal No. (Symbol)	Tool Setting	Condition
    B51-30 (CAN+) - B49-6 (E1)	1 V/DIV, 10 μsec/DIV	Ignition switch ON

    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
    
    

    Terminal No. (Symbol)	Tool Setting	Condition
    B51-36 (CAN-) - B49-6 (E1)	1 V/DIV, 10 μsec/DIV	Ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 19: Identifying Waveform 18

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