Terminals Of ECM

Fig 1: Identifying ECM Connectors 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 STD Voltage column. The graphic above can be used as a reference to identify the ECM terminal locations.

1. WAVEFORM 1

   Fuel injector 

   WAVEFORM 1 REFERENCE TABLE
   
   

   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

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2. WAVEFORM 2

   Knock sensor 

   WAVEFORM 2 REFERENCE TABLE
   
   

   ECM Terminal Name	Between KNK1 and EKNK Between KNK2 and EKN2
   Tester Range	1 V/DIV., 1 msec./DIV.
   Condition	Maintain engine RPM at 2000 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

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3. WAVEFORM 3

   Camshaft timing oil control valve (OCV) 

   WAVEFORM 3 REFERENCE TABLE
   
   

   ECM Terminal Name	Between OC1+ and OC1- Between OC2+ and OC2-
   Tester Range	0.2 V/DIV., 200 msec./DIV.
   Condition	Accelerate slowly after engine warmed up

   HINT:

   In the Data List, the items VVT OCV Duty (Bank 1) and (Bank 2) show the duty ratio of voltage flowing to the OCV (see Fig 4).

   VVT OCV Duty (Bank 1), (Bank 2) = A/B x 100 (%)

   Fig 4: Identifying Waveform 3

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4. WAVEFORM 4

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

   WAVEFORM 4 REFERENCE TABLE
   
   

   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

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5. WAVEFORM 5

   Camshaft position sensor and Crankshaft position sensor 

   WAVEFORM 5 REFERENCE TABLE
   
   

   ECM Terminal Name	Between G2+ and G2-
   Tester Range	2 V/DIV., 200 msec./DIV
   Condition	Idle after engine warmed up

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 6: Identifying Waveform 5

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6. WAVEFORM 6

   Vehicle speed signal 

   WAVEFORM 6 REFERENCE TABLE
   
   

   ECM Terminal Name	Between SPD and E1
   Tester Range	5 V/DIV., 10 msec./DIV.
   Condition	Driving by 40 km/h (25 mph)

   HINT:

   The wavelength becomes shorter as engine rpm increases.

   Fig 7: Identifying Waveform 6

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7. WAVEFORM 7

   Throttle actuator positive terminal 

   WAVEFORM 7 REFERENCE TABLE
   
   

   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

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8. WAVEFORM 8

   Throttle actuator negative terminal 

   WAVEFORM 8 REFERENCE TABLE
   
   

   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

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9. WAVEFORM 9

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

   WAVEFORM 9 REFERENCE TABLE
   
   

   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

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10. WAVEFORM 10

    Heated oxygen (HO2) sensor 

    WAVEFORM 10 REFERENCE TABLE
    
    

    ECM Terminal Names	Between OX1B and E1 Between OX2B and E1
    Tester Ranges	0.2 V/DIV., 200 msec./DIV.
    Conditions	Engine speed maintained 2500 rpm for 2 minutes after warming up sensor

    Fig 11: Identifying Waveform 10

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    In the Data List, item O2S B1 S2 or O2S B2 S2 shows the ECM input values from the heated oxygen sensor.

11. WAVEFORM 11

    Engine speed signal 

    WAVEFORM 11 REFERENCE TABLE
    
    

    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

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002