Terminals Of ECM

Fig 1: Identifying Terminals Of ECM

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

1. WAVEFORM 1 
   Fig 2: Identifying Waveform 1

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   Camshaft timing oil control valve (OCV) 

   WAVEFORM 1 REFERENCE CHART
   
   

   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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   Heated oxygen sensor 

   WAVEFORM 2 REFERENCE CHART
   
   

   ECM Terminal Name	Between OX1B and E2 or OX2B and E2
   Tester Range	0.2 V/DIV, 200 msec./DIV
   Condition	Engine speed maintained a 2,500 RPM for 2 minutes after warming up engine

   HINT:

   In DATA LIST, item O2S B1 S2 shows the ECM input values from the heated oxygen sensor.

3. WAVEFORM 3 
   Fig 4: Identifying Waveform 3

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   Injector No.1 (to No.6) injection signal 

   WAVEFORM 3 REFERENCE CHART
   
   

   ECM Terminal Name	Between #10 (to #60) and E1
   Tester Range	2 V/DIV, 20 msec./DIV
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine RPM increases.

4. WAVEFORM 4 
   Fig 5: Identifying Waveform 4

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   Knock sensor 

   WAVEFORM 4 REFERENCE CHART
   
   

   ECM Terminal Name	Between KNK1 and EKNK1 Between KNK2 and EKNK2
   Tester Range	0.01 to 10 V/DIV, 0.01 to 10 msec./DIV
   Condition	Engine speed maintained a 4,000 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.
5. WAVEFORM 5 
   Fig 6: Identifying Waveform 5

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   Crankshaft position sensor and VVT 

   WAVEFORM 5 REFERENCE CHART
   
   

   ECM Terminal	Name Between NE+ and NE- Between VV1+ and NE- or VV2+ and NE-
   Tester Range	5 V/DIV, 20 msec./DIV
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine RPM increases.

6. WAVEFORM 6 
   Fig 7: Identifying Waveform 6

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

   WAVEFORM 6 REFERENCE CHART
   
   

   ECM Terminal Name	Between IGT (1 to 6) and E1 Between IGF1 and E1
   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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   EVAP VSV 

   WAVEFORM 7 REFERENCE CHART
   
   

   ECM Terminal Name	Between PRG and E1
   Tester Range	5 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.

8. WAVEFORM 8 
   Fig 9: Identifying Waveform 8

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   Vehicle speed signal 

   WAVEFORM 8 REFERENCE CHART
   
   

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

   HINT:

   The wavelength becomes shorter as the vehicle speed increases.

9. WAVEFORM 9 
   Fig 10: Identifying Waveform 9

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   Throttle actuator positive terminal 

   WAVEFORM 9 REFERENCE CHART
   
   

   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.

10. WAVEFORM 10 
    Fig 11: Identifying Waveform 10

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    Throttle actuator negative terminal 

    WAVEFORM 10 REFERENCE CHART
    
    

    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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    CAN communication signal 

    WAVEFORM 11 REFERENCE CHART
    
    

    ECM Terminal Name	Between CANH and E1
    Tester Range	1 V/DIV, 10 s/DIV
    Condition	Stop engine and Ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

12. WAVEFORM 12 
    Fig 13: Identifying Waveform 12

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    CAN communication signal 

    WAVEFORM 12 REFERENCE CHART
    
    

    ECM Terminal Name	Between CANL and E1
    Tester Range	1 V/DIV, 10 s/DIV
    Condition	Stop engine and Ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.