Terminals Of ECM

Fig 1: Identifying ECM Terminals

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HINT:

The standard normal voltage between each pair of the ECM (included in hybrid vehicle control ECU) terminals is shown in ECM TERMINALS REFERENCE TABLE . 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 the terminals, displayed in the "Specified Condition" column. The Fig 1 above can be used as a reference to identify the ECM terminal locations.

1. WAVEFORM 1 

   Camshaft timing oil control valve (OCV): 

   CAMSHAFT TIMING OIL CONTROL VALVE REFERENCE
   
   

   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 rpm increases.

   Fig 2: Identifying Waveform 1 Graph

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2. WAVEFORM 2 

   Heated oxygen sensor: 

   HEATED OXYGEN SENSOR REFERENCE
   
   

   ECM Terminal Name	Between OX1B and O1B-
   Tester Range	0.2 V/DIV., 200 ms./DIV.
   Condition	Engine speed maintained at 2,500 rpm for 2 minutes after warming up engine

   HINT:

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

   Fig 3: Identifying Waveform 2 Graph

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3. WAVEFORM 3 

   Injector No. 1 (to No. 4) injection signal: 

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

   ECM Terminal Name	Between #10 (to #40) and E1
   Tester Range	2 V/DIV., 20 ms./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 4: Identifying Waveform 3 Graph

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4. WAVEFORM 4 

   Knock sensor: 

   KNOCK SENSOR REFERENCE
   
   

   ECM Terminal Name	Between KNK1 and EKNK
   Tester Range	0.01 to 10 V/DIV., 0.01 to 10 ms./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.
     Fig 5: Identifying Waveform 4 Graph

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5. WAVEFORM 5 

   Crankshaft position sensor and Camshaft position sensor: 

   CRANKSHAFT POSITION SENSOR AND CAMSHAFT POSITION SENSOR REFERENCE
   
   

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

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 6: Identifying Waveform 5 Graph

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6. WAVEFORM 6 

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

   IGNITER IGT SIGNAL (FROM ECM TO IGNITER) AND IGNITER IGF SIGNAL (FROM IGNITER TO ECM) REFERENCE
   
   

   ECM Terminal Name	Between IGT (1 to 4) and E1 Between IGF and E1
   Tester Range	2 V/DIV., 20 ms./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 7: Identifying Waveform 6 Graph

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7. WAVEFORM 7 

   Purge VSV: 

   PURGE VSV REFERENCE
   
   

   ECM Terminal Name	Between PRG and E1
   Tester Range	5 V/DIV., 50 ms./DIV.
   Condition	Idling

   HINT:

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

   Fig 8: Identifying Waveform 7 Graph

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8. WAVEFORM 8 

   Vehicle speed signal: 

   VEHICLE SPEED SIGNAL REFERENCE
   
   

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

   HINT:

   The wavelength becomes shorter as the vehicle speed increases.

   Fig 9: Identifying Waveform 8 Graph

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9. WAVEFORM 9 

   Throttle actuator positive terminal: 

   THROTTLE ACTUATOR POSITIVE TERMINAL REFERENCE
   
   

   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.

   Fig 10: Identifying Waveform 9 Graph

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10. WAVEFORM 10 

    Throttle actuator negative terminal: 

    THROTTLE ACTUATOR NEGATIVE TERMINAL REFERENCE
    
    

    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.

    Fig 11: Identifying Waveform 10 Graph

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11. WAVEFORM 11 

    CAN communication signal: 

    CAN COMMUNICATION SIGNAL REFERENCE
    
    

    ECM Terminal Name	Between CANH and E1
    Tester Range	1 V/DIV., 10 μs/DIV.
    Condition	Stop engine and Power switch ON (IG)

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 12: Identifying Waveform 11 Graph

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12. WAVEFORM 12 

    CAN communication signal: 

    CAN COMMUNICATION SIGNAL REFERENCE
    
    

    ECM Terminal Name	Between CANL and E1
    Tester Range	1 V/DIV., 10 μs/DIV.
    Condition	Stop engine and Power switch ON (IG)

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 13: Identifying Waveform 12 Graph

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002