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 Models.
• *3: for Manual Transmission Models.

1. WAVEFORM 1 
   Fig 2: Identifying Waveform 1

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   Fuel injector

   ECM Terminal Name	Between #10 (to #40) and E01
   Tester Range	20 V/DIV., 20 ms./DIV.
   Condition	Idling

   HINT: 

   The wavelength becomes shorter as the engine speed increases.

2. WAVEFORM 2 
   Fig 3: Identifying Waveform 2

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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 4) and E1 (b) Between IGF1 and E1
      Tester Range	2 V/DIV., 20 ms./DIV.
      Condition	Idling

      HINT: 

      The wavelength becomes shorter as the engine speed increases.

3. WAVEFORM 3 
   Fig 4: Identifying Waveform 3

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   1. Camshaft position sensor
   2. Crankshaft position sensor

      ECM Terminal Name	(a) Between G2 and NE- (b) Between NE+ and NE-
      Tester Range	5 V/DIV., 20 ms./DIV.
      Condition	Idling

      HINT: 

      The wavelength becomes shorter as the engine speed increases.

4. WAVEFORM 4 
   Fig 5: Identifying Waveform 4

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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.

5. WAVEFORM 5 
   Fig 6: Identifying Waveform 5

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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.

6. WAVEFORM 6 
   Fig 7: Identifying Waveform 6

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   Heated oxygen sensor

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

   HINT: 

   In the DATA LIST, item O2S B1S2 shows the ECM input values from the heated oxygen sensor.

7. WAVEFORM 7 
   Fig 8: Identifying Waveform 7

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   Air fuel ratio sensor heater

   ECM Terminal Name	Between HA1A and E04
   Tester Range	5 V/DIV., 10 ms./DIV.
   Condition	Idling with warm engine

   HINT: 

   The wavelength varies in accordance with the engine operating condition.

8. WAVEFORM 8 
   Fig 9: Identifying Waveform 8

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   Knock sensor

   ECM Terminal Name	Between KNK1 and EKNK
   Tester Range	1 V/DIV., 0.01 to 1 ms./DIV.
   Condition	Engine speed maintained 4000 RPM after warming up engine

   HINT: 

   • The wavelength becomes shorter as the engine speed increases.
   • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
9. WAVEFORM 9 
   Fig 10: Identifying Waveform 9

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   Camshaft timing oil control valve

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

   HINT: 

   The wavelength becomes shorter as the engine speed increases.

10. WAVEFORM 10 
    Fig 11: Identifying Waveform 10

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    Purge VSV

    ECM Terminal Name	Between PRG and E01
    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.

11. WAVEFORM 11 
    Fig 12: Identifying Waveform 11

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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 speed increases.

12. WAVEFORM 12 
    Fig 13: Identifying Waveform 12

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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 20 km/h (12 mph)

    HINT: 

    The wavelength becomes shorter as the vehicle speed 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 μs./DIV.
    Condition	Ignition switch ON

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 μs./DIV.
    Condition	Ignition switch ON

15. WAVEFORM 15 
    Fig 16: Identifying Waveform 15

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    Terminal DI of air injection control driver

    ECM Terminal Name	Between AIDI and E1
    Tester Range	5 V/DIV., 50 ms./DIV.
    Condition	Secondary air injection system operates

    HINT: 

    The wavelength changes when the air injection control driver detects malfunctions in the air injection system. Refer to INSPECTION PROCEDURE .