Terminals Of ECM

Fig 1: Identifying Terminals Of ECM

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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.

The illustration above can be used as a reference to identify the ECM terminal locations.

1. WAVEFORM 1 
   1. Camshaft Position (CMP) sensor
   2. Crankshaft Position (CKP) sensor
      WAVEFORM 1 REFERENCE
      
      

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

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 2: Identifying Waveform 1

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. WAVEFORM 2 
   1. Vehicle speed signal
      WAVEFORM 2 REFERENCE
      
      

      ECM Terminal Names	Between SP2+ and SP2-
      Tester Ranges	5 V/DIV, 10 msec./DIV
      Conditions	Driving at 25 mph (40 km/h)

      HINT:

      The wavelength becomes shorter as the vehicle speed increases.

      Fig 3: Identifying Waveform 2

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. WAVEFORM 3 
   1. Igniter IGT signal (from ECM to igniter)
   2. Igniter signal IGF (from igniter to ECM)
      WAVEFORM 3 REFERENCE
      
      

      ECM Terminal Names	Between IGT1 (to IGT4) 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 4: Identifying Waveform 3

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. WAVEFORM 4 
   1. Fuel injector
      WAVEFORM 4 REFERENCE
      
      

      ECM Terminal Names	Between #10 (to 40) and E1
      Tester Ranges	5 V/DIV, 10 msec./DIV
      Conditions	Slow acceleration with warm engine

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 5: Identifying Waveform 4

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. WAVEFORM 5 
   1. EVAP VSV
      WAVEFORM 5 REFERENCE
      
      

      ECM Terminal Names	Between PRG and E1
      Tester Ranges	5 V/DIV, 50 msec./DIV
      Conditions	Slow acceleration with warm engine

      HINT:

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

      Fig 6: Identifying Waveform 5

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. WAVEFORM 6 
   1. VVT OCV, VVTL OCV
      WAVEFORM 6 REFERENCE
      
      

      ECM Terminal Names	Between OC1+ and OC1- Between VVL+ and VVL-
      Tester Ranges	5 V/DIV, 200 msec./DIV
      Conditions	Slow acceleration when warming up sensor

      HINT:

      In the DATA LIST, item VVT OCV DUTY B1 shows the duty ratio of the voltage flowing to the OCV (see illustration on left).

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

      Fig 7: Identifying Waveform 6

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. WAVEFORM 7 
   1. Front Heated Oxygen (HO2) Sensor
      WAVEFORM 7 REFERENCE
      
      

      ECM Terminal Names	Between OX1A and E1
      Tester Ranges	0.2 V/DIV, 200 msec./DIV
      Conditions	Engine maintained at 2,500 rpm when warming up sensor

      HINT:

      In the DATA LIST, items HO2S B1 S1 and HO2S B2 S1 show the ECM input values of the front HO2 sensor.

      Fig 8: Identifying Waveform 7

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
8. WAVEFORM 8 
   1. Rear Heated Oxygen (HO2) sensor
      WAVEFORM 8 REFERENCE
      
      

      ECM Terminal Names	Between OX1A and E1
      Tester Ranges	0.2 V/DIV, 200 msec./DIV
      Conditions	Engine maintained at 2,500 rpm when warming up sensor

      HINT:

      In the DATA LIST, items HO2S B1 S2 and HO2S B2 S2 show the ECM input values from the rear HO2 sensor.

      Fig 9: Identifying Waveform 8

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
9. WAVEFORM 9 
   1. Knock sensor
      WAVEFORM 9 REFERENCE
      
      

      ECM Terminal Names	Between KNK1 and EKNK Between KNK2 and EKN2
      Tester Ranges	1 V/DIV, 1 msec./DIV
      Conditions	Engine maintained at 2,000 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 10: Identifying Waveform 9

        Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
10. WAVEFORM 10 
    1. Airbag sensor
       WAVEFORM 10 REFERENCE
       
       

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

       HINT:

       The duty ratio changes depending on the engine coolant temperature.

       Fig 11: Identifying Waveform 10

       Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002