Terminals Of ECM

Fig 1: Identifying ECM Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

1. WAVEFORM 1 

   Camshaft timing oil control valve (OCV) 

   WAVEFORM REFERENCE (WAVEFORM 1) TABLE
   
   

   ECM Terminal Names	Between OC1+ and OC1- or OC2+ and OC2-
   Tester Ranges	5 V/DIV, 1 msec./DIV
   Conditions	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 2: Identifying Waveform Graph (Camshaft Timing Oil Control Valve)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. WAVEFORM 2 

   Heated oxygen sensor 

   WAVEFORM REFERENCE (WAVEFORM 2) TABLE
   
   

   ECM Terminal Names	Between OX1B and E2 or OX2B and E2
   Tester Ranges	0.2 V/DIV, 200 msec./DIV
   Conditions	Engine speed maintained 2500 rpm for 2 minutes after warming up sensor

   HINT:

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

   Fig 3: Identifying Waveform Graph (Heated Oxygen Sensor)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. WAVEFORM 3 

   Fuel injector 

   WAVEFORM REFERENCE (WAVEFORM 3) TABLE
   
   

   ECM Terminal Names	Between #10 (to 60) and E01
   Tester Ranges	30 V/DIV, 20 msec./DIV
   Conditions	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 4: Identifying Waveform Graph (Fuel Injector)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. WAVEFORM 4 

   Knock sensor 

   WAVEFORM REFERENCE (WAVEFORM 4) TABLE
   
   

   ECM Terminal Names	Between KNK1 and EKNK or KNK2 and EKN2
   Tester Ranges	0.01 to 10 V/DIV, 0.01 to 10 msec./DIV
   Conditions	Maintain engine speed 4000 rpm after warming up engine

   HINT:

   • The wavelength becomes shorter as the engine rpm increases.
   • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
     Fig 5: Identifying Waveform Graph (Knock Sensor)

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. WAVEFORM 5 
   1. VVT sensor
   2. Crankshaft position sensor
      WAVEFORM REFERENCE (WAVEFORM 5) TABLE
      
      

      ECM Terminal Names	Between NE+ and NE- Between VV1+ and VV1- or VV2+ and VV2-
      Tester Ranges	2 V/DIV, 20 msec./DIV
      Conditions	Idling

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 6: Identifying Waveform Graph (Waveform 5)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. WAVEFORM 6 
   1. Igniter IGT signal (from ECM to igniter)
   2. Igniter IGF signal (from igniter to ECM)
      WAVEFORM REFERENCE (WAVEFORM 6) TABLE
      
      

      ECM Terminal Names	Between IGT (1 to 6) and E1 Between IGF1 and E1
      Tester Ranges	2 V/DIV, 20 msec./DIV
      Conditions	Idling

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 7: Identifying Waveform Graph (Waveform 6)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. WAVEFORM 7 

   Purge VSV 

   WAVEFORM REFERENCE (WAVEFORM 7) TABLE
   
   

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

   HINT:

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

   Fig 8: Identifying Waveform Graph (EVAP VSV)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
8. WAVEFORM 8 

   Vehicle speed signal 

   WAVEFORM REFERENCE (WAVEFORM 8) TABLE
   
   

   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 9: Identifying Waveform Graph (Vehicle Speed Signal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
9. WAVEFORM 9 

   Throttle actuator positive terminal 

   WAVEFORM REFERENCE (WAVEFORM 9) TABLE
   
   

   ECM Terminal Names	Between M+ and ME01
   Tester Ranges	5 V/DIV, 1 msec./DIV
   Conditions	Idling with warm engine

   HINT:

   The duty ratio varies depending on the throttle actuator operation.

   Fig 10: Identifying Waveform Graph (Throttle Actuator Positive Terminal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
10. WAVEFORM 10 

    Throttle actuator negative terminal 

    WAVEFORM REFERENCE (WAVEFORM 10) TABLE
    
    

    ECM Terminal Names	Between M- and ME01
    Tester Ranges	5 V/DIV, 1 msec./DIV
    Conditions	Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 11: Identifying Waveform Graph (Throttle Actuator Negative Terminal)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
11. WAVEFORM 11 

    Engine speed signal 

    WAVEFORM REFERENCE (WAVEFORM 11) TABLE
    
    

    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 12: Identifying Waveform Graph (Engine Speed Signal)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
12. WAVEFORM 12 

    Airbag sensor assembly 

    WAVEFORM REFERENCE (WAVEFORM 12) TABLE
    
    

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

    Fig 13: Identifying Waveform Graph (Airbag Sensor Assembly)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002