Terminals Of ECM

Fig 1: Identifying ECM Terminals

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HINT:

The standard normal voltage between each pair of ECM terminals is shown in ECM TERMINALS TABLE  . 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 Fig 1 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 

   Fuel injector 

   WAVEFORM 1 (FUEL INJECTOR)
   
   

   ECM Terminal Names	Between #10 (to #80) and E01
   Tester Range	20 V/DIV., 20 msec./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as engine rpm increases.

   Fig 2: Identifying Waveform 1 (Fuel Injector)

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2. WAVEFORM 2 

   Knock sensor 

   WAVEFORM 2 (KNOCK SENSOR)
   
   

   ECM Terminal Name	Between KNK1 and EKNK Between KNK2 and EKN2
   Tester Range	1 V/DIV., 1 msec./DIV.
   Condition	Maintain engine RPM at 2,000 rpm after engine warmed-up

   HINT:

   • The wavelength becomes shorter as engine rpm increases.
   • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
   Fig 3: Identifying Waveform 2 (Knock Sensor)

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3. WAVEFORM 3 

   Camshaft timing oil control valve (OCV) 

   WAVEFORM 3 CAMSHAFT TIMING OCV
   
   

   ECM Terminal Name	Between OC1+ and OC1- Between OC2+ and OC2-
   Tester Range	5 V/DIV., 200 msec./DIV.
   Condition	Accelerate slowly after engine warmed up

   HINT:

   In the DATA LIST, the items OCV DUTY B1 and B2 show the duty ratio of voltage flowing to the OCV (see Fig 4 ).

   OCV DUTY B1, B2 = A/B x 100 (%)

   Fig 4: Identifying Waveform 3 (Camshaft Timing Oil Control Valve)

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4. WAVEFORM 4 

   Variable Valve Timing (VVT) sensor (bank 1, 2) and Crankshaft position sensor 

   WAVEFORM 4 VVT SENSOR (BANK 1, 2) AND CRANKSHAFT POSITION SENSOR
   
   

   ECM Terminal Name	CH1: Between VV1+ and VV1- CH2: Between VV2+ and VV2- CH3: Between NE+ and NE-
   Tester Range	2 V/DIV., 20 msec./DIV.
   Condition	Idle after engine warmed-up

   HINT:

   The wavelength becomes shorter as engine rpm increases.

   Fig 5: Identifying Waveform 4 (Variable Valve Timing Sensor)

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5. WAVEFORM 5 

   Camshaft position sensor 

   WAVEFORM 5 CAMSHAFT POSITION SENSOR
   
   

   ECM Terminal Name	Between G2+ and G2-
   Tester Range	2 V/DIV., 200 msec./DIV.
   Condition	Idle after engine warmed up

   HINT:

   • The wavelength becomes shorter as engine rpm increases.
   • *1: Crank angle
   • *2: 180°
   • *3: 120°
   • *4: 60°
     Fig 6: Identifying Waveform 5 (Camshaft Position Sensor)

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6. WAVEFORM 6 

   Vehicle speed signal 

   WAVEFORM 6 VEHICLE SPEED SIGNAL
   
   

   ECM Terminal Name	Between SPD and E1
   Tester Range	5 V/DIV., 20 msec./DIV.
   Condition	Driving by 40 km/h (25 mph)

   Fig 7: Identifying Waveform 6 (Vehicle Speed Signal)

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7. WAVEFORM 7 

   Throttle actuator positive terminal 

   WAVEFORM 7 THROTTLE ACTUATOR POSITIVE TERMINAL
   
   

   ECM Terminal Name	Between M+ and ME01
   Tester Range	5 V/DIV., 1 msec./DIV.
   Condition	Idle after engine warmed-up

   HINT:

   The duty ratio varies depending on the throttle opening operation.

   Fig 8: Identifying Waveform 7 (Throttle Actuator Positive Terminal)

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8. WAVEFORM 8 

   Throttle actuator negative terminal 

   WAVEFORM 8 THROTTLE ACTUATOR NEGATIVE TERMINAL
   
   

   ECM Terminal Name	Between M-and ME01
   Tester Range	5 V/DIV., 1 msec./DIV.
   Condition	Idle after engine warmed-up

   HINT:

   The duty ratio varies depending on the throttle opening operation.

   Fig 9: Identifying Waveform 8 (Throttle Actuator Negative Terminal)

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9. WAVEFORM 9 

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

   WAVEFORM 9 IGNITER IGT SIGNAL (FROM ECM TO IGNITER) AND IGNITER IGF SIGNAL (FROM IGNITER TO ECM)
   
   

   ECM Terminal Name	(a) Between IGT1 (to IGT8) and E1 (b) Between IGF1 (IGF2) and E1
   Tester Range	2 V/DIV., 20 msec./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as engine rpm increases.

   Fig 10: Identifying Waveform 9 (Igniter IGT Signal)

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10. WAVEFORM 10 

    Heated oxygen (HO2) sensor 

    WAVEFORM 10 HO2 SENSOR
    
    

    ECM Terminal Names	Between OX1B and E2
    Tester Ranges	0.2 V/DIV., 200 msec./DIV.
    Conditions	Engine speed maintained 2,500 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.

    Fig 11: Identifying Waveform 10 (HO2 Sensor)

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11. WAVEFORM 11 

    Engine speed signal 

    WAVEFORM 11 ENGINE SPEED SIGNAL
    
    

    ECM Terminal Names	Between TACH and E1
    Tester Range	5 V/DIV., 10 msec./DIV.
    Condition	Idling

    HINT:

    The wavelength becomes shorter as engine rpm increases.

    Fig 12: Identifying Waveform 11 (Engine Speed Signal)

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12. WAVEFORM 12 

    Air fuel ratio (A/F) sensor heater signal 

    WAVEFORM 12 (A/F SENSOR HEATER SIGNAL)
    
    

    ECM Terminal Names	Between HA1A and E04 Between HA2A and E04
    Tester Range	5 V/DIV., 10 msec./DIV.
    Condition	Idling

    Fig 13: Identifying Waveform 12 (A/F Sensor Heater Signal)

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13. WAVEFORM 13 

    Purge VSV 

    WAVEFORM 13 PRUGE VSV
    
    

    ECM Terminal Names	Between PRG and E1
    Tester Range	10 V/DIV., 50 msec./DIV.
    Condition	Idling

    HINT:

    The wavelength becomes shorter as vehicle speed increases.

    Fig 14: Identifying Waveform 13 (Purge VSV)

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14. WAVEFORM 14 

    CAN communication signal 

    WAVEFORM 14 CAN COMMUNICATION SIGNAL
    
    

    ECM Terminal Names	Between CANH and E1
    Tester Range	1 V/DIV., 10 sec./DIV.
    Condition	Stop engine and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 15: Identifying Waveform 14 (CAN Communication Signal)

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15. WAVEFORM 15 

    CAN communication signal 

    WAVEFORM 15 CAN COMMUNICATION SIGNAL
    
    

    ECM Terminal Names	Between CANL and E1
    Tester Range	1 V/DIV., 10 sec./DIV.
    Condition	Stop engine and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 16: Identifying Waveform 15 (CAN Communication Signal)

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16. WAVEFORM 16 

    Terminal DI of air injection control driver 

    WAVEFORM 16 TERMINAL DI OF AIR INJECTION CONTROL DRIVER
    
    

    ECM Terminal Names	Between AIDI and E1
    Tool setting	5 V/DIV, 20 to 40 msec./DIV
    Condition	Performing ACTIVE TEST using intelligent tester (air injection control system)

    Fig 17: Identifying Waveform 16 (Terminal DI Of Air Injection Control Driver)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength changes when the air injection control driver detects malfunctions in the air injection system (see DTC P0412: SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE "A" Circuit ).