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 is also indicated.

The result of checks should be compared with the standard voltage for that pair of terminals, displayed in the STD Voltage column.

Fig 1 can be used as a reference to identify the ECM terminal locations.

1. WAVEFORM 1 
   1. Airbag sensor assembly
      WAVEFORM 1 REFERENCE
      
      

      ECM Terminal Names	Between F/PS and E1
      Tester Ranges	5 V/DIV, 500 msec./DIV
      Conditions	Idling with warm engine

      Fig 2: Identifying Waveform 1

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2. WAVEFORM 2 
   1. Vehicle speed signal
      WAVEFORM 2 REFERENCE
      
      

      ECM Terminal Names	Between SPD and E1
      Tester Ranges	5 V/DIV, 20 msec./DIV
      Conditions	Driving at 12 mph (20 km/h)

      HINT:

      The wavelength becomes shorter as the vehicle speed increases.

      Fig 3: Identifying Waveform 2

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3. WAVEFORM 3 
   1. Engine speed signal
      WAVEFORM 3 REFERENCE
      
      

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

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 4: Identifying Waveform 3

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4. WAVEFORM 4 
   1. EVAP VSV
      WAVEFORM 4 REFERENCE
      
      

      ECM Terminal Names	Between EVP1 and E01
      Tester Ranges	5 V/DIV, 50 msec./DIV
      Conditions	Idling

      HINT:

      If the waveform is not similar to Fig 5, check the waveform again after idling for 10 minutes or more.

      Fig 5: Identifying Waveform 4

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5. WAVEFORM 5 
   1. Heated oxygen sensor (sensor 1)
      WAVEFORM 5 REFERENCE
      
      

      ECM Terminal Names	Between OX1A and E1
      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 B1S1 shows the ECM input values from the front heated oxygen sensor (sensor 1).

      Fig 6: Identifying Waveform 5

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6. WAVEFORM 6 
   1. Heated oxygen sensor (sensor 2)
      WAVEFORM 6 REFERENCE
      
      

      ECM Terminal Names	Between OX1B and E1
      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 (sensor 2).

      Fig 7: Identifying Waveform 6

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7. WAVEFORM 7 
   1. Camshaft position sensor
   2. Crankshaft position sensor
      WAVEFORM 7 REFERENCE
      
      

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

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 8: Identifying Waveform 7

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8. WAVEFORM 8 
   1. Fuel injector
      WAVEFORM 8 REFERENCE
      
      

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

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 9: Identifying Waveform 8

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9. WAVEFORM 9 
   1. Igniter IGT signal (from ECM to igniter)
   2. Igniter IGF signal (from igniter to ECM)
      WAVEFORM 9 REFERENCE
      
      

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

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 10: Identifying Waveform 9

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10. WAVEFORM 10 
    1. Camshaft timing oil control valve (OCV)
       WAVEFORM 10 REFERENCE
       
       

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

       HINT:

       The wavelength becomes shorter as the engine rpm increases.

       Fig 11: Identifying Waveform 10

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11. WAVEFORM 11 
    1. Knock sensor
       WAVEFORM 11 REFERENCE
       
       

       ECM Terminal Names	Between KNK1 and EKNK
       Tester Ranges	0.01 to 10 V/DIV, 0.01 to 10 msec./DIV
       Conditions	Engine maintained at 4,000 rpm when warming up sensor

       HINT:

       • The wavelength becomes shorter as the engine rpm increases.
       • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
         Fig 12: Identifying Waveform 11

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12. WAVEFORM 12 
    1. Terminal SIL of DLC3
       WAVEFORM 12 REFERENCE
       
       

       ECM Terminal Names	Between SIL and E1
       Tester Ranges	5 V/DIV, 1 msec./DIV
       Conditions	Connect intelligent tester or OBD II scan tool to DLC3

       Fig 13: Identifying Waveform 12

       Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002