Terminals Of ECM

Fig 1: ECM Connector Terminal Identification

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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.

• *1: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
• *2: for Automatic Transmission

1. WAVEFORM 1 
   Fig 2: Identifying Waveform 1

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   CAMSHAFT TIMING OIL CONTROL VALVE (OCV)
   
   

   ECM Terminal Name	Between OC1+ and OC1- or OC2+ and OC2-
   Tester Range	5 V/DIV, 1 msec./DIV
   Condition	Idling

   HINT: 

   The wavelength becomes shorter as the engine RPM increases.

2. WAVEFORM 2 
   Fig 3: Identifying Waveform 2

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   AIR FUEL RATIO SENSOR HEATER
   
   

   ECM Terminal Name	CH1: Between HA1A and E04 CH2: Between HA2A and E05
   Tester Range	5 V/DIV, 10 msec./DIV
   Condition	Idling with warm engine

   HINT: 

   The wavelength varies in accordance with the engine operating condition.

3. WAVEFORM 3 
   Fig 4: Identifying Waveform 3

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   HEATED OXYGEN SENSOR
   
   

   ECM Terminal Name	Between OX1B and EX1B or OX2B and EX2B
   Tester Range	0.2 V/DIV, 200 msec./DIV
   Condition	Engine speed maintained at 2500 RPM for 2 minutes after warming up sensor

   HINT: 

   In the Data List, item O2S B1S2 or O2S B2S2 shows the ECM input values from the heated oxygen sensor.

4. WAVEFORM 4 
   Fig 5: Identifying Waveform 4

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   FUEL INJECTOR
   
   

   ECM Terminal Name	Between #10 (to 60) and E01
   Tester Range	30 V/DIV, 20 msec./DIV
   Condition	Idling

   HINT: 

   The wavelength becomes shorter as the engine RPM increases.

5. WAVEFORM 5 
   Fig 6: Identifying Waveform 5

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   KNOCK SENSOR
   
   

   ECM Terminal Name	Between KNK1 and EKNK or KNK2 and EKN2
   Tester Range	0.01 to 10 V/DIV, 0.01 to 10 msec./DIV
   Condition	Engine speed maintained at 4000 RPM after warming up engine

   HINT: 

   • The wavelength becomes shorter as the engine RPM increases.
   • The waveforms and amplitudes displayed on the tester differ slightly depending on the vehicle.
6. WAVEFORM 6 
   Fig 7: Identifying Waveform 6

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   1. Crankshaft position sensor
   2. VVT sensor

      ECM Terminal Name	(a) Between NE+ and NE- (b) Between VV1+ and VV1- or VV2+ and VV2-
      Tester Range	2 V/DIV, 20 msec./DIV
      Condition	Idling

      HINT: 

      The wavelength becomes shorter as the engine RPM increases.

7. WAVEFORM 7 
   Fig 8: Identifying Waveform 7

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

      ECM Terminal Name	(a) Between IGT (1 to 6) and E1 (b) Between IGF1 and E1
      Tester Range	2 V/DIV, 20 msec./DIV
      Condition	Idling

      HINT: 

      The wavelength becomes shorter as the engine RPM increases.

8. WAVEFORM 8 
   Fig 9: Identifying Waveform 8

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   PURGE VSV
   
   

   ECM Terminal Name	Between PRG and E1
   Tester Range	10 V/DIV, 50 msec./DIV
   Condition	Idling

   HINT: 

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

9. WAVEFORM 9 
   Fig 10: Identifying Waveform 9

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   VEHICLE SPEED SIGNAL
   
   

   ECM Terminal Name	Between SPD and E1
   Tester Range	2 V/DIV, 20 msec./DIV
   Condition	Driving at 20 km/h (12 mph)

   HINT: 

   The wavelength becomes shorter as the vehicle speed increases.

10. WAVEFORM 10 
    Fig 11: Identifying Waveform 10

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    THROTTLE ACTUATOR POSITIVE TERMINAL
    
    

    ECM Terminal Name	Between M+ and ME01
    Tester Range	5 V/DIV, 1 msec./DIV
    Condition	Idling with warm engine

    HINT: 

    The duty ratio varies depending on the throttle actuator operation.

11. WAVEFORM 11 
    Fig 12: Identifying Waveform 11

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    THROTTLE ACTUATOR NEGATIVE TERMINAL
    
    

    ECM Terminal Name	Between M- and ME01
    Tester Range	5 V/DIV, 1 msec./DIV
    Condition	Idling with warm engine

    HINT: 

    The duty ratio varies depending on the throttle actuator operation.

12. WAVEFORM 12 
    Fig 13: Identifying Waveform 12

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    ENGINE SPEED SIGNAL
    
    

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

    HINT: 

    The wavelength becomes shorter as the engine RPM increases.

13. WAVEFORM 13 
    Fig 14: Identifying Waveform 13

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    AIRBAG SENSOR ASSEMBLY
    
    

    ECM Terminal Name	Between F/PS and E1
    Tester Range	5 V/DIV, 500 msec./DIV
    Condition	Idling with warm engine

14. WAVEFORM 14 
    Fig 15: Identifying Waveform 14

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    CAN COMMUNICATION SIGNAL (REFERENCE)
    
    

    ECM Terminal Name	Between CANH and E1
    Tester Range	1 V/DIV, 10 μsec./DIV
    Condition	Stop engine and ignition switch to ON

    HINT: 

    The wavelength varies depending on the CAN communication signal.

15. WAVEFORM 15 
    Fig 16: Identifying Waveform 15

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    CAN COMMUNICATION SIGNAL (REFERENCE)
    
    

    ECM Terminal Name	Between CANL and E1
    Tester Range	1 V/DIV, 10 μsec./DIV
    Condition	Stop engine and ignition switch to ON

    HINT: 

    The wavelength varies depending on the CAN communication signal.