Terminals Of ECM

Fig 1: Identifying Terminals Of ECM

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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.

1. WAVEFORM 1 

   Camshaft timing oil control valve (OCV) (Exhaust side): 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	Between OE1+ and OE1- or OE2+ and OE2-
   Tester Range	5 V/DIV., 1 msec./DIV.
   Condition	Idling with warm engine

   Fig 2: Camshaft Timing Oil Control Valve - Waveform Graph

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2. WAVEFORM 2 

   A/F sensor heater: 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	CH1: Between HA1A and E1 CH2: Between HA2A and E1
   Tester Range	5 V/DIV., 10 msec./DIV.
   Condition	Idling with warm engine

   HINT:

   The wavelength becomes shorter as the engine RPM increases.

   Fig 3: A/F Sensor Heater - Waveform Graph

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3. WAVEFORM 3 

   Heated oxygen sensor: 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	Between OX1B and E2 or OX2B and E2
   Tester Range	0.2 V/DIV., 200 msec./DIV.
   Condition	Engine speed maintained at 2500 RPM for 2 minutes after warming up

   HINT:

   In Data List, item O2S B1 S2 or O2S B2 S2 shows the ECM input values from the heated oxygen sensor.

   Fig 4: Heated Oxygen Sensor - Waveform Graph

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4. WAVEFORM 4 

   Injector for port injection No. 1 (to No. 8) injection signal: 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	Between #10 (to #80) and E1
   Tester Range	5 V/DIV., 5 msec./DIV.
   Condition	Idling and engine coolant temperature 60°C or less

   HINT:

   The wavelength becomes shorter as the engine RPM increases.

   Fig 5: Injector For Port Injection No. 1 (To No. 8) Injection Signal - Waveform Graph

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5. WAVEFORM 5 

   Injector for direct injection No. 1 (to No. 8) injection signal and Injection confirmation signal: 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	CH1: Between #1 or #6 and E1 CH2: Between INJF1 and E1
   	CH1: Between #4 or #7 and E1 CH2: Between INJF2 and E1
   	CH1: Between #5 or #8 and E1 CH2: Between INJF3 and E1
   	CH1: Between #2 or #3 and E1 CH2: Between INJF4 and E1
   Tester Range	2 V/DIV., 20 msec./DIV.
   Condition	Idling with warm engine

   HINT:

   The wavelength becomes shorter as the engine RPM increases.

   Fig 6: Injector For Direct Injection No. 1 (To No. 8) Injection Signal And Injection Confirmation Signal - Waveform Graph

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6. WAVEFORM 6 

   Knock sensor: 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	Between KNK1 and EKNK Between KNK2 and EKN2 Between KNK3 and ENK3 Between KNK4 and ENK4
   Tester Range	0.01 to 10 V/DIV., 0.01 to 10 msec./DIV.
   Condition	Engine speed maintained at 4000 RPM after warming up engine

   Fig 7: Knock Sensor - Waveform Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   • The wavelength becomes shorter as the engine RPM increases.
   • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
7. WAVEFORM 7 

   Crankshaft position sensor and VVT sensor for intake side: 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	Between NE+ and NE- Between VV1+ and VV1- Between VV2+ and VV2-
   Tester Range	5 V/DIV., 20 msec./DIV.
   Condition	Idling with warm engine

   HINT:

   The wavelength becomes shorter as the engine RPM increases.

   Fig 8: Crankshaft Position Sensor And VVT Sensor For Intake Side - Waveform Graph

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8. WAVEFORM 8 

   Crankshaft position sensor and VVT sensor for exhaust side: 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	Between NE+ and NE- Between EV1+ and EV1- Between EV2+ and EV2-
   Tester Range	5 V/DIV., 20 msec./DIV.
   Condition	Idling with warm engine

   HINT:

   The wavelength becomes shorter as the engine RPM increases.

   Fig 9: Crankshaft Position Sensor And VVT Sensor For Exhaust Side - Waveform Graph

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9. WAVEFORM 9 

   Crankshaft position sensor and camshaft position sensor: 

   WAVEFORM REFERENCE
   
   

   ECM Terminal Name	CH1: Between NE+ and NE- CH2: Between G2+ and G2-
   Tester Range	5 V/DIV., 20 msec./DIV.
   Condition	Idling with warm engine

   HINT:

   The wavelength becomes shorter as the engine RPM increases.

   Fig 10: Crankshaft Position Sensor And Camshaft Position Sensor - Waveform Graph

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10. WAVEFORM 10 

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

    WAVEFORM REFERENCE
    
    

    ECM Terminal Name	CH1: Between IGT (1 to 8) and E1 CH2: Between IGF1 and E1 or IGF2 and E1
    Tester Range	2 V/DIV., 20 msec./DIV.
    Condition	Idling with warm engine

    HINT:

    The wavelength becomes shorter as the engine RPM increases.

    Fig 11: Igniter IGT Signal (From ECM To Igniter) And Igniter IGF Signal - Waveform Graph

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11. WAVEFORM 11 

    Purge VSV: 

    WAVEFORM REFERENCE
    
    

    ECM Terminal Name	Between PRG and E1
    Tester Range	10 V/DIV., 20 msec./DIV.
    Condition	Idling with warm engine

    HINT:

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

    Fig 12: Purge VSV - Waveform Graph

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12. WAVEFORM 12 

    Vehicle speed signal: 

    WAVEFORM REFERENCE
    
    

    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.

    Fig 13: Vehicle Speed Signal - Waveform Graph

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13. WAVEFORM 13 

    Throttle actuator negative terminal: 

    WAVEFORM REFERENCE
    
    

    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.

    Fig 14: Throttle Actuator Negative Terminal - Waveform Graph

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14. WAVEFORM 14 

    Throttle actuator positive terminal: 

    WAVEFORM REFERENCE
    
    

    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.

    Fig 15: Throttle Actuator Positive Terminal - Waveform Graph

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15. WAVEFORM 15 

    Engine speed signal: 

    WAVEFORM REFERENCE
    
    

    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.

    Fig 16: Engine Speed Signal - Waveform Graph

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16. WAVEFORM 16 

    Fuel pump for high pressure (spill control valve) (bank 1): 

    WAVEFORM REFERENCE
    
    

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

    Fig 17: Fuel Pump For High Pressure (Spill Control Valve) (Bank 1) - Waveform Graph

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17. WAVEFORM 17 

    Fuel pump for high pressure (spill control valve) (bank 2): 

    WAVEFORM REFERENCE
    
    

    ECM Terminal Name	CH1: Between FPD2 and E1 CH2: Between FPF2 and E1
    Tester Range	2 V/DIV., 5 msec./DIV.
    Condition	1200 RPM with warm engine

    Fig 18: Fuel Pump For High Pressure (Spill Control Valve) (Bank 2) - Waveform Graph

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18. WAVEFORM 18 

    CAN communication signal: 

    WAVEFORM REFERENCE
    
    

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

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 19: CAN Communication Signal - Waveform Graph

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19. WAVEFORM 19 

    CAN communication signal: 

    WAVEFORM REFERENCE
    
    

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

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 20: CAN Communication Signal - Waveform Graph

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20. WAVEFORM 20 

    Recharging control signal 

    WAVEFORM REFERENCE
    
    

    ECM Terminal Name	Between RLO and E1
    Tester Range	2 V/DIV., 50 msec./DIV.
    Condition	Idling

    Fig 21: Recharging Control Signal - Waveform Graph

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21. WAVEFORM 21 

    Intake air control valve signal 

    WAVEFORM REFERENCE
    
    

    ECM Terminal Name	Between ASM+ and ASM-
    Tester Range	5 V/DIV., 5 msec./DIV.
    Condition	Warm engine and 3000 RPM

    Fig 22: Intake Air Control Valve Signal - Waveform Graph

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22. WAVEFORM 22 

    Camshaft timing control motor EMD signal: 

    WAVEFORM REFERENCE
    
    

    ECM Terminal Name	Between EMD1 and E1 or EMD2 and E1
    Tester Range	2 V/DIV., 100 msec./DIV.
    Condition	Idling with warm engine

    HINT:

    The wavelength becomes shorter as the engine RPM increases.

    Fig 23: Camshaft Timing Control Motor EMD Signal - Waveform Graph

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23. WAVEFORM 23 

    Camshaft timing control motor EMR signal: 

    WAVEFORM REFERENCE
    
    

    ECM Terminal Name	Between EMR1 and E1 or EMR2 and E1
    Tester Range	2 V/DIV., 5 msec./DIV.
    Condition	Idling with warm engine

    HINT:

    The wavelength becomes shorter as the engine RPM increases.

    Fig 24: Camshaft Timing Control Motor EMR Signal - Waveform Graph

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24. WAVEFORM 24 

    Camshaft timing control motor EPT signal: 

    WAVEFORM REFERENCE
    
    

    ECM Terminal Name	Between EDT1 and E1 or EDT2 and E1
    Tester Range	1 V/DIV., 5 msec./DIV.
    Condition	Idling with warm engine

    HINT:

    The wavelength becomes shorter as the engine RPM increases.