Terminals Of ECM

Fig 1: Identifying ECM Terminals

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HINT:

The standard normal 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 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:

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

1. WAVEFORM 1 

   Fuel injector 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Names	Between #10 (to #80) and E01
   Tester Range	20 V/DIV., 20 msec./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as engine rpm increases.

   Fig 2: Identifying Waveform 1 (Fuel Injunction)

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2. WAVEFORM 2 

   Knock sensor 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	Between KNK1 and EKNK Between KNK2 and EKN2
   Tester Range	1 V/DIV., 1 msec./DIV.
   Condition	Maintain engine RPM at 2,000 rpm after engine warmed-up

   HINT:

   • The wavelength becomes shorter as engine rpm increases.
   • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
     Fig 3: Identifying Waveform 2 (Knock Sensor)

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3. WAVEFORM 3 

   Camshaft timing oil control valve (OCV) 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	Between OC1+ and OC1- Between OC2+ and OC2-
   Tester Range	5 V/DIV., 200 msec./DIV.
   Condition	Accelerate slowly after engine warmed-up

   HINT:

   In the DATA LIST, the items VVT OCV DUTY B1 and B2 show the duty ratio of voltage flowing to the OCV (see ).

   VVT OCV DUTY B1, B2 = A/B x 100 (%)

   Fig 4: Identifying Waveform 3 (Camshaft Timing Oil Control Valve (OCV))

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4. WAVEFORM 4 

   Variable Valve Timing (VVT) sensor (bank 1, 2) and Crankshaft position sensor 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	CH1: Between VV1+ and VV1- CH2: Between VV2+ and VV2- CH3: Between NE+ and NE-
   Tester Range	2 V/DIV., 20 msec./DIV.
   Condition	Idle after engine warmed-up

   HINT:

   The wavelength becomes shorter as engine rpm increases.

   Fig 5: Identifying Waveform 4 (Variable Valve Timing Sensor)

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5. WAVEFORM 5 

   Camshaft position sensor 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	CH1: Between G2+ and G2- CH2: Between NE+ and NE-
   Tester Range	5 V/DIV, 20 msec./DIV
   Condition	Idle after engine warmed up

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 6: Identifying Waveform 5 (Camshaft Position Sensor)

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6. WAVEFORM 6 

   Vehicle speed signal 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	Between SPD and E1
   Tester Range	5 V/DIV., 20 msec./DIV.
   Condition	Driving by 40 km/h (25 mph)

   HINT:

   The wavelength becomes shorter as engine rpm increases.

   Fig 7: Identifying Waveform 6 (Vehicle Speed Signal)

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7. WAVEFORM 7 

   Throttle actuator positive terminal 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	Between M+ and E1
   Tester Range	5 V/DIV., 1 msec./DIV.
   Condition	Idle after engine warmed-up

   HINT:

   The duty ratio varies depending on the throttle opening operation.

   Fig 8: Identifying Waveform 7 (Throttle Actuator Positive Terminal)

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8. WAVEFORM 8 

   Throttle actuator negative terminal 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	Between M- and E1
   Tester Range	5 V/DIV., 1 msec./DIV.
   Condition	Idle after engine warmed-up

   HINT:

   The duty ratio varies depending on the throttle opening operation.

   Fig 9: Identifying Waveform 8 (Throttle Actuator Negative Terminal)

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9. WAVEFORM 9 

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

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	Between IGT1 (to IGT8) and E1 Between IGF1 (IGF2) and E1
   Tester Range	2 V/DIV., 20 msec./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as engine rpm increases.

   Fig 10: Identifying Waveform 9 (Igniter IGT Signal)

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10. WAVEFORM 10 

    Heated oxygen (HO2) sensor 

    WAVEFORM REFERENCE
    
    

    ECM Terminal Names	Between OX1B (OX2B) and E2
    Tester Ranges	0.2 V/DIV., 200 msec./DIV.
    Conditions	Engine speed maintained 2,500 rpm for 2 minutes after warming up sensor

    HINT:

    In the DATA LIST, item O2S B1S2 shows the ECM input values from the heated oxygen sensor.

    Fig 11: Identifying Waveform 10 (Heated Oxygen (HO2) Sensor)

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11. WAVEFORM 11 

    Engine speed signal 

    WAVEFORM REFERENCE
    
    

    ECM Terminal Names	Between TACH and E1
    Tester Range	5 V/DIV., 10 msec./DIV.
    Condition	Idling

    HINT:

    The wavelength becomes shorter as engine rpm increases.

    Fig 12: Identifying Waveform 11 (Engine Speed Signal)

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