Terminals Of ECM

Fig 1: Identifying ECM Connector Terminals

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HINT: 

The standard normal voltage between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the 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.

HINT: 

*: The ECM terminal voltage is constant regardless of the output voltage from the sensor.

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- Between OE1+ and OE1- or OE2+ and OE2-
   Tester Range	5 V/DIV, 1 ms./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:
   
   

   ECM Terminal Name	Between OX1B and O1B- or OX2B and O2B-
   Tester Range	0.2 V/DIV, 200 ms./DIV
   Condition	Maintain engine speed at 2500 rpm for 2 minutes after warning up sensor

   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:
   
   

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

   ECM Terminal Name	Between KNK1 and EKNK Between KNK2 and EKNK2
   Tester Range	0.01 to 10 V/DIV, 0.01 to 10 ms./DIV
   Condition	Maintain engine speed at 4000 rpm after warning up

   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 SENSOR FOR INTAKE CAMSHAFT:
   
   

   ECM Terminal Name	Between NE+ and NE- Between VV1+ and VV1- or VV2+ and VV2-
   Tester Range	5 V/DIV, 20 ms./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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   CRANKSHAFT POSITION SENSOR AND VVT SENSOR FOR EXHAUST CAMSHAFT:
   
   

   ECM Terminal Name	Between NE+ and NE- Between EV1+ and EV1- or EV2+ and EV2-
   Tester Range	5 V/DIV, 20 ms./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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   IGNITER IGT SIGNAL (FROM ECM TO IGNITER) AND IGNITER IGF SIGNAL (FROM IGNITER TO ECM):
   
   

   ECM Terminal Name	Between IGT (1 to 6) and E1 Between IGF1 and E1 or IGF2 and E1
   Tester Range	2 V/DIV, 20 ms./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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   EVAP VSV:
   
   

   ECM Terminal Name	Between PRG and E1
   Tester Range	5 V/DIV, 50 ms./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	5 V/DIV, 20 ms./DIV
   Condition	Driving at 12 mph (20 km/h)

   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 ms./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 ms./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 ms./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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    INJECTOR NO. 1 (TO NO. 6) INJECTION SIGNAL AND INJECTION CONFIRMATION SIGNAL:
    
    

    ECM Terminal Name	Between INJF and E1
    Tester Range	2 V/DIV, 20 ms./DIV
    Condition	Idling

    HINT: 

    The wavelength becomes shorter as the engine rpm increases.

14. WAVEFORM 14 
    Fig 15: Identifying Waveform 14

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    HIGH PRESSURE SIDE FUEL PUMP (SPILL VALVE):
    
    

    ECM Terminal Name	CH1: Between FPD and E1 CH2: Between FPF1 and E1
    Tester Range	2 V/DIV, 5 ms./DIV
    Condition	Idling

15. WAVEFORM 15 
    Fig 16: Identifying Waveform 15

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    DC MOTOR FOR SCV POSITIVE TERMINAL:
    
    

    ECM Terminal Name	Between IA1+ and E01
    Tester Range	5 V/DIV, 1 ms./DIV
    Condition	Idling

16. WAVEFORM 16 
    Fig 17: Identifying Waveform 16

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    DC MOTOR FOR SCV NEGATIVE TERMINAL:
    
    

    ECM Terminal Name	Between IA1- and E01
    Tester Range	5 V/DIV, 1 ms./DIV
    Condition	Idling

17. WAVEFORM 17 
    Fig 18: Identifying Waveform 17

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    CAN COMMUNICATION SIGNAL:
    
    

    ECM Terminal Name	Between CANH and E1
    Tester Range	1 V/DIV, 10 μs/DIV
    Condition	Engine switch on (IG)

    HINT: 

    The waveform varies depending on the CAN communication signal.

18. WAVEFORM 18 
    Fig 19: Identifying Waveform 18

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    CAN COMMUNICATION SIGNAL:
    
    

    ECM Terminal Name	Between CANL and E1
    Tester Range	1 V/DIV, 10 μs/DIV
    Condition	Engine switch on (IG)

    HINT: 

    The waveform varies depending on the CAN communication signal.