Terminals Of ECM

Fig 1: Identifying ECM Connectors Terminals

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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.

HINT: 

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

*2: Automatic Transaxle

1. WAVEFORM 1 
   Fig 2: Identifying Waveform 1

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   CAMSHAFT TIMING OIL CONTROL VALVE
   
   

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

2. WAVEFORM 2 
   Fig 3: Identifying Waveform 2

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   AIR FUEL RATIO SENSOR (SENSOR 1) HEATER
   
   

   ECM Terminal Name	Between HA1A and E04
   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 (SENSOR 2)
   
   

   ECM Terminal Name	Between OX1B and EX1B
   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 Data List, item O2S B1 S2 shows the ECM input values from the heated oxygen sensor.

4. WAVEFORM 4 
   Fig 5: Identifying Waveform 4

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   INJECTOR NO. 1 (TO NO. 4) INJECTION SIGNAL
   
   

   ECM Terminal Name	Between #10 (to #40) and E01
   Tester Range	20 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
   Tester Range	1 V/DIV., 1 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 differ slightly depending on the vehicle.
6. WAVEFORM 6 
   Fig 7: Identifying Waveform 6

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   CRANKSHAFT POSITION SENSOR AND CAMSHAFT POSITION SENSOR
   
   

   ECM Terminal Name	CH1: Between G2+ and G2- CH2: Between NE+ and NE-
   Tester Range	5 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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   IGNITER IGT SIGNAL (FROM ECM TO IGNITER) AND IGNITER IGF SIGNAL (FROM IGNITER TO ECM)
   
   

   ECM Terminal Name	Between IGT (1 to 4) 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.

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., 20 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 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 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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    CAN COMMUNICATION SIGNAL (REFERENCE)
    
    

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

    HINT: 

    The waveform varies depending on the CAN communication signal.

14. WAVEFORM 14 
    Fig 15: Identifying Waveform 14

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    CAN COMMUNICATION SIGNAL (REFERENCE)
    
    

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

    HINT: 

    The waveform varies depending on the CAN communication signal.